NB/SH/T 0857-2013 Light-duty direct injection diesel engine oil ring sticking and piston cleanliness evaluation method

AI-translated method card — human verification pending. This is not an official translation of the standard. Unclear source values remain unverified; check the original standard and product certificate before use.

Card type: Test method

1. Method number / full name / English name / replacement relationship

• Standard number: NB/SH/T 0857—2013
• Chinese name: Light-duty direct injection diesel engine oil ring sticking and piston cleanliness evaluation method
• English name: Passenger car direct injection diesel engine ring sticking and piston cleanliness test
• Replacement relationship: not provided in the available source (the foreword only states “modified adoption of CEC L-78-99 (9th edition)”, and does not mention replacing any old edition standard)
• Adoption relationship: modified adoption of CEC L-78-99 (9th edition) “Light-duty direct injection diesel engine oil ring sticking and piston cleanliness test method”
• Publication/implementation: published on 2013-06-08, implemented on 2013-10-01
• Issuing body: National Energy Administration
• Drafting organization: PetroChina Dalian Lubricant Research and Development Center
• Main drafters: Jiang Chaogui, Huang Shengjun, Zhao Xi

2. Scope of application and non-applicability

• 1.1 This standard specifies the test method for factory-fill oils and service oils for turbocharged diesel engines.
• 1.2 This standard applies to the scope of evaluating engine oil applicability through piston cleanliness and ring sticking tendency and changes in oil performance.
• 1.3 This standard uses International System of Units (SI) units.
• 1.4 The application of this standard may involve some hazardous materials, operations and equipment, but it does not address all safety issues related thereto. Users are responsible for establishing appropriate safety and protection measures before using this standard, and for determining the applicability of relevant regulatory restrictions.
• Non-applicable scope: not provided in the available source.

3. Method principle

• 4.1 Before each test, the power-producing part of the engine shall be completely disassembled, cleaned with solvent naphtha and measured, then reassembled strictly according to technical requirements. New pistons, piston rings and cylinder block shall be installed, the engine crankcase and all components shall be cleaned with solvent naphtha, and the cylinder head gasket, connecting rod bolts and worn parts shall be replaced.
• 4.2 The test bench shall have auxiliary equipment for controlling speed, load and various test conditions. The engine used is the Golf A3 series diesel engine produced by Volkswagen AG, Germany. The test oil is used as lubricant, and under specified speed, load and other test conditions it runs continuously for 54h, divided into 18 cycles, each cycle 3h, and each cycle is composed of several stages (idle, oil temperature 40℃, no load; 150min, 4150r/min, oil temperature 145℃, full load), each ... (source-text extraction noise, requires confirmation against the source standard) ... h break-in. After the test, the engine is disassembled, the performance of the test oil is evaluated through ring sticking and piston cleanliness, and the deterioration of cylinder liners, camshafts, tappets, bearings and valve spring elastic washers is assessed visually.

4. Reagents and materials (purity / preparation)

• 6.1 Fuel: use fuel with sulfur content of 0.25% (mass fraction) ~ 0.3% (mass fraction); quality indicators are given in Annex A. Each test requires about 1000kg fuel.
• 6.2 Test oil: each test requires about 10L test oil.
• 6.3 Engine coolant: the test shall use antifreeze meeting the requirements of Table 6 as engine coolant.
  • Table 6 Antifreeze composition: water 50%, ethylene glycol C12+, or antifreeze meeting the requirements of SH/T 0521 50%.
  • Note: It is recommended to replace the coolant under the following conditions: a) a major light metal component has been replaced in the coolant circuit; b) after operation for 300h.
• 6.4 Solvent naphtha: when cleaning the engine and accessories, use solvent naphtha No. 2 meeting the requirements of GB 1922, or an equivalent product.
• 6.5 Petroleum ether: analytical grade, meeting the requirements of GB/T 15894, or an equivalent product.
• 6.6 Sandpaper: meeting the requirements of GB/T 7498, not lower than No. 100.

5. Instruments and equipment

• 5.1 Engine: the test engine is the Golf A3 series vehicle diesel engine produced by Volkswagen AG, Germany; its model and technical parameters are shown in Table 1.
  • Table 1 Engine model and technical parameters (some values in source-text extraction require confirmation against the source standard):
    • Engine model: 028.R / ATD (requires confirmation against the source standard)
    • Year: 1995/6
    • Displacement: 1896 cm³
    • Number of cylinders: 4 cylinders
    • Maximum torque: 235 N·m/1900 r/min
    • Power: 81 kW/4150 r/min
    • Bore: 79.50 mm
    • Piston stroke: 95.50 mm
    • Compression ratio: 19.5:1
    • Initial fill oil: 4.5L
    • Valve train: hydraulic gas (requires confirmation against the source standard)
    • Turbocharger: variable turbine
    • Piston cooling method: oil nozzle spray
• 5.2 Components
  • 5.2.1 Engine assembly parts: the parts used for engine assembly and test bench installation are shown in Table 2 (including cylinder block, cylinder head, 1/2 cylinder piston, 3/4 cylinder piston, compression ring, trapezoidal ring, oil scraper ring, piston pin, elastic retaining ring, cylinder head gasket, oil pan gasket, connecting rod lower bearing shell/upper bearing shell, main bearing, connecting rod bolts, cylinder head bolts, drive shaft seal ring, sealing flange, oil filter, turbocharger, high-pressure oil pump, ignition solenoid valve, engine control unit, generator, charge air pipe thermocouple, air mass measuring device, boost control valve, EGR valve, accelerator pedal sensor, water pump belt, toothed drive belt, air filter, etc., including part numbers). Note: different cylinder head gaskets may be selected according to different piston protrusion. Parts marked with * are respectively included in the Marshall (Marshall) company MI50 / MI51 / MI52 component groups.
  • 5.2.2 Recommended engine assembly parts and test bench installation parts are shown in Table 3 (relay, starting device, transmission 02A-MQ, engine mount, hydraulic bearing, flywheel, pressure plate, clutch plate, screws, engine bracket, swing damper, intercooler, air hose, intake hose, seal ring, pressure hose, pressure pipe, connecting pipe, coolant pipe, cooling water pipe, exhaust pipe, pipe gasket, etc., including part numbers).
  • 5.2.3 Parts that need to be replaced for each test are shown in Table 4 (piston 1, 2 cylinder; piston 3, 4 cylinder; compression ring; oil scraper ring; piston pin; elastic retaining ring; cylinder sand salt (requires confirmation against the source standard); oil filter, etc., including part numbers and quantities).
• 5.3 Engine installation
  • 5.3.1 EGR valve and exhaust manifold ... except ... the connecting line between the valve and the exhaust manifold. The pipe opening at the exhaust pipe is sealed with a metal plate. (source-text extraction noise, requires confirmation against the source standard)
  • 5.3.2 Engine installation position: the engine will be installed on the test bench in the following manner: a) each engine is offset along the crankshaft axial direction toward the flywheel side by 2°; b) the engine is offset along the cylinder radial direction toward the exhaust side by 15°. If ... that is, coinciding with the crankshaft (forming 0°), this situation is allowed, but shall be recorded in the test report. During installation, specific ... or related transmission devices may be used. (source-text extraction noise, requires confirmation against the source standard)
• 5.4 Coolant circulation
  • 5.4.1 The standard cooling circuit will be modified as follows in the test: when the oil circuit and thermostat bypass are disconnected, the test bench uses a water/water heat exchanger instead of the cooler.
  • 5.4.2 Use test bench control equipment ... to control temperature. The coolant container is fitted with a standard pressure cap (line pressure 140kPa±20kPa). If the coolant does not exceed 6 ... may ... (source-text extraction noise, requires confirmation against the source standard)
  • 5.4.3 In the heating system, ... shall not ... (source-text extraction noise, requires confirmation against the source standard)
  • 5.4.4 Flow rate 25L/min 3D min (requires confirmation against the source standard). ... the flow rate of the coolant. When the engine's early ... speed reaches ..., the coolant flow rate shall be 90±1 L/min 5L/min (requires confirmation against the source standard). Select the appropriate connection disc according to the cooling system outlet flange. The temperature difference between the inlet and outlet in the system cannot be controlled; it shall be checked through the heat exchanger ... (source-text extraction noise, requires confirmation against the source standard)
• 5.5 Oil cooling system: the standard oil/water heat exchanger connected to the oil filter is separate from the cooling system of the evaluation bench. Temperature is controlled by test bench control equipment. The engine cooling system is shown in Figure 1.
• 5.6 Crankcase ... the maximum pressure difference before and after is 60kPa. (source-text extraction noise, requires confirmation against the source standard)
• 5.7 Measuring ... pressure ... device (source-text extraction noise, requires confirmation against the source standard)
• 5.8 not provided in the available source
• 5.9 To this ... (source-text extraction noise, requires confirmation against the source standard)
• 5.10 ... leakage ... (source-text extraction noise, requires confirmation against the source standard)
• 5.11 not provided in the available source
• 5.12 The turbocharger and ... are identified by “WAG8.8”. The oil nozzle for cooling the piston is shown in Figure 2. (source-text extraction noise, requires confirmation against the source standard)
• 5.13 Measurements, positions and grades are shown in Table 5.
  • Table 5 Measurements, positions and grades (parameter | position | note | grade):
    • Ambient air pressure | In the laboratory | — | B
    • Room temperature | In a lighted area of the laboratory | — | B
    • Air humidity | In a lighted area of the laboratory | — | B
    • Engine speed | — | Measured by test bench control equipment | A
    • Engine torque | — | Measured by test bench control equipment | A
    • Boost intake pressure | At about 300mm before the charge air intake pipe inlet, at the same position as connection ECU | — | A
    • Exhaust back pressure | About 430mm from the turbocharger outlet flange | — | A
    • Oil pressure | Inside the oil filter | — | B
    • Intake temperature | At the air filter inlet | — | B
    • Boost intake temperature | In the same region as the intake pressure | — | A
    • Exhaust temperature | In the same region as the exhaust back pressure | — | A
    • Coolant inlet temperature | The top of the thermocouple should be in the middle of the flowing coolant | — | A
    • Coolant outlet temperature | At 280mm before the water pump thermostat | — | B
    • Oil temperature in the oil tank | The top of the thermocouple should be in the middle of the flowing coolant | — | B
    • Fuel temperature | At 300mm below the coolant outlet flange | — | A
    • Smoke density | Plug in the oil drain plug | The top of the thermocouple should be inserted into the oil at 20mm | A
    • Oil consumption | At the injection pump inlet oil pipe bolt connection | The top of the thermocouple should be inserted into the fuel at 5mm, but must not affect the fuel flow | A
    • Blowby gas amount | After the muffler or pressure control valve, approximately 3900mm from the turbocharger outlet flange | Recommended to use AVL 415 or AVL 415S instruments | B
    • Oil consumption | — | Measure oil consumption by the gravimetric method or the volumetric method. If the volumetric method is used to measure oil consumption, the ambient temperature must be evaluated and correction must be performed within a certain period; otherwise, use the gravimetric method | B
    • Blowby gas amount | — | Continuously measured in a closed crankcase ventilation system. The oil is collected in the blowby system through a separator. | B
  • Note: The "Position" and "Notes" columns in Table 5 are serialized due to source-text extraction, and the correspondence requires confirmation against the source standard (source-text extraction).

6. Recommended operating conditions

• 10.3.2 The formal test conditions are shown in Table 12.
  • Table 12 Engine formal test conditions:
    • Running time/min: First stage 30; second stage 150
    • Engine speed/(r/min): First stage idle; second stage 4150±15
    • Torque: First stage 0; second stage maximum
    • Oil pan oil temperature/℃: First stage 40±3; second stage 145±3
    • Coolant outlet temperature/℃: First stage 30±2; second stage 90±3
    • Intake air temperature/℃: First stage 28 (preferably controlled at 28℃, not lower than 24℃); second stage 28 (preferably controlled at 28℃, not lower than 24℃)
    • Intake air temperature after supercharging/℃: First stage 30 (preferably controlled at 30℃, not lower than 25℃); second stage 60±3
    • Fuel inlet temperature/℃: First stage 28 (preferably controlled at 28℃, not lower than 24℃); second stage 28 (preferably controlled at 28℃, not lower than 24℃)
    • Exhaust back pressure/kPa: First stage 1.2±0.5 maximum; second stage 17.5±1.5
  • 10.3.2.1 At the start of the first stage, the time for the coolant outlet temperature to drop from 90℃±3℃ to 30℃±2℃ shall be controlled within 7min±1min; at the start of the second stage, the time to rise from 30℃±2℃ to 90℃±3℃ shall be controlled within 3min±1min.
  • 10.3.2.2 At the start of the first stage, the time for the coolant outlet temperature to drop from 90℃±3℃ to 30℃±2℃ shall be controlled within 7min±1min; at the start of the second stage, the time to rise from 30℃±2℃ to 90℃±3℃ shall be controlled within 3min±1min. (Duplicate of 10.3.2.1, original text as such)
  • 10.3.2.3 From the start of the first stage, the time for the oil pan temperature to drop from 145℃±3℃ to 40℃±3℃ shall be controlled within 15min±1min; at the start of the second stage, the time for the oil pan temperature to rise from 40℃±3℃ to 145℃±3℃ shall be controlled within 6min±1min.
  • 10.3.2.4 At the start of the first stage, the speed and torque values shall be reached within 1min; at the start of the second stage, the speed and torque values shall be reached within 2min.
  • 10.3.2.5 Other conditions are shown in Table 12, and calibration values are shown in Table 14. All required values shall be reached within 15min.
• 10.3.4 The calibration values for the test run are shown in Table 14.
  • Table 14 Test run calibration values:
    • Stage one: Running time 30min; power 0kW; injection quantity 5.6±0.7 mg/cycle; supercharged intake pressure 0~0.019 MPa (estimated); coolant inlet temperature 90±15℃; minimum oil pressure 0.20 MPa; exhaust temperature —; smoke density (41SFSN) maximum 0.5
    • Stage two: Running time 150min; power 81±3 kW (requires confirmation against the source standard); injection quantity 39.5±0.5 mg/cycle; supercharged intake pressure 0.1890~0.1960 MPa (accurate); difference between coolant outlet and inlet temperatures less than 10°; minimum oil pressure 0.13 MPa; exhaust temperature 630±20℃; smoke density 2.8±0.4
    • Note: If the limit is exceeded, check the coolant flow rate, as detailed in clause 5.4. If it shows a certain relationship with the AVL 415 measurement, AVL 415S may also be used to modify the calibration value limits.
  • 10.3.4.1 During the break-in running procedure (full load 2h break-in running), the operating conditions and calibration values need to be adjusted.
  • 10.3.4.2 If the engine required power cannot be reached, the fault shall be checked and eliminated.
• 10.3.6 The recommended values for engine shutdown are shown in Table 15.
  • Table 15 Recommended values for engine shutdown:
    • Maximum temperature: Oil pan 160℃; coolant outlet temperature 110℃; exhaust temperature 800℃
    • Minimum oil pressure: During the break-in stage (0h~2h) 50kPa; during the test 50kPa
    • Power: At the start of the test, the power may be lower than the rated power 5%
    • Maximum engine speed: 4400 r/min
    • Blowby gas amount: At the start of the test, (the blowby gas amount) may be double the rated value
• 8.5 Test and adjustment values: Idle 900 r/min; injection valve opening pressure...0MPa±1.0MPa, wear limit 19.0MPa-3...MPa (source-text extraction noise, requires confirmation against the source standard)

7. Sampling and specimen preparation

• 6.2 Each test requires approximately 10L test oil.
• 10.1 Pre-test preparation work: At room temperature, the volume... (source-text extraction noise, requires confirmation against the source standard)
• 10.3 After the engine break-in test procedure is completed, install a new oil filter and air filter. And at room temperature, add a volume of 4.5L test oil to the engine, and also retain 0.2L new test oil as a sample.
• 10.3.8.1 After the durability test run is completed, collect the test oil, including the test oil in the filter (when the temperature of the oil in the oil pan is approximately 100℃ and the piston of cylinder 1 is kept at top dead center, drain the oil 15min), weigh it, and record the oil consumption.
• 10.3.8.2 Take out 1L of the test oil after the test and retain it as a sample.
• 11.3 Determine the performance of the oil before and after the test; the measurement items and test methods are shown in Table 16.

8. Analysis procedure

• 10.2 The test procedure includes the break-in procedure and the formal test procedure.
• 10.2.1 The break-in test procedure is shown in Table 10.
  • Table 10 Break-in test procedure (revolutions r/min | time/min | total time/h): 1750 | 6 | 0:06; 1900 | 6 | 0:12; 2000 (requires confirmation against the source standard) | 6 | 0:18; 2250 | 6 | 0:24; 2250 (requires confirmation against the source standard) | 6 | 0:30; 2750 | 6 | 0:36; 3000 | 6 | 0:42; ... | 6 | 0:48; ... | 6 | 0:54; ... | 6 | 1:00; ... | 6 | 1:06; ... | 6 | 1:12; ... | 6 | 1:18; ... | 6 | 1:24; ... | 15 | 1:39; ... | ... | 1:...; 1900 | ... | ... (source-text extraction severe noise, requires confirmation against the source standard)
  • Note 1: Between stages 13~16... one drain... before oil... (source-text extraction noise, requires confirmation against the source standard)
  • Note 2: Except for 16... (source-text extraction noise, requires confirmation against the source standard)
  • Note 3: Record full load B... procedure. (source-text extraction noise, requires confirmation against the source standard)
  • Note: ... shall be carried out ... adjustment to ... . 17 The stage is ... except for measurement after 20min, the parameters of all other stages shall be measured after 40min. Record the following data: engine speed, torque and fuel consumption. Other test parameters shall also be recorded. (source-text extraction noise, requires confirmation against the source standard)
• 10.2.2 Record oil consumption: Record fuel consumption according to the gravimetric method (oil... when the oil... filter replacement... temperature approximately 100℃, keep the piston of cylinder 1 at top dead center, drain the oil 15min), and at the same time replace the oil and oil filter. (source-text extraction noise, requires confirmation against the source standard)
• 10.3 Formal test procedure (see Section 6 Recommended operating conditions).
• 10.3.1 The overview of the engine durability test is shown in Table 11.
  • Table 11 Engine durability test: time/h 1/15 | Engine speed/(r/min) 1500 | Torque (N·m) 20 | Remarks Warm-up; time/h 54 | Engine speed/(r/min) PK Cycle | Torque (N·m) Test run; time/h — | Engine speed/(r/min) Idle | Torque (N·m) 0 | Remarks Oil temperature cooled to 100℃
  • Note: The test starts when the engine speed and torque reach the set target values. These values should meet the requirements in the table above.
• 10.3.3 Test operation record: The parameters recorded every 15min during the test are shown in Table 13.
  • Table 13 Parameters recorded during the test: Speed r/min; Power kW; Torque N·m; Specific fuel consumption g/kWh; Fuel consumption kg/h; Coolant inlet temperature ℃; Coolant outlet temperature ℃; Intercooler outlet temperature (charge air temperature) ℃; Fuel temperature ℃; Oil sump oil temperature ℃; Room temperature ℃; Exhaust temperature ℃; Main oil gallery oil pressure MPa; Charge air pressure after intercooler MPa; Exhaust back pressure kPa; Smoke density FSN
• 10.3.5 Measurements during the test
  • 10.3.5.1 Some measured values in Table 12 and Table 13 involved during the test shall be recorded at least once within 15min. If the test process stops (interrupts), it shall also be recorded.
  • 10.3.5.2 In step 1, the smoke density value shall be tested at least once. In step 2, the smoke density value needs to be tested 8 times. The first test shall be after 20min.
• 10.3.7 Oil addition: Adding oil is not allowed during the test.
• 10.3.8 End of test and engine disassembly (see Section 7 for sampling).
• 11.1.1 Piston ring sticking: After engine disassembly... under the condition of washing, within 2h, each piston ring sticking of the engine shall be evaluated, and the piston ring sticking evaluation shall be evaluated according to SH/T 0264 Appendix... and 5.5. When evaluating ring sticking... the piston rings stuck in the ring grooves do not need to be removed; these ring grooves are evaluated as deposits of 100%. Carefully remove all piston rings (clean rings/stuck rings/spot stuck rings). (source-text extraction unclear in the source text, requires confirmation against the source standard)
• 11.1.2 Piston rating: The oil sludge stuck on the piston is cleaned with petroleum ether at room temperature. After the piston dries naturally, the piston cleanliness is evaluated within 1h. The piston cleanliness evaluation method is given in Appendix B.
• 11.2 Other engine components: ... to evaluate the condition of the engine cylinder liner, cam, tappet, bearing and the elastic washer of the valve spring. ... abnormal wear. (source-text extraction unclear in the source text, requires confirmation against the source standard)
• 11.3 Analysis: ... performance changes of the oil after the test. Determine the performance of the oil before and after the test. The determination items and test methods are shown in Table 16.
  • Table 16 Determination items and test methods: Acid value GB/T 7304; Fe content GB/T 17476; Gr content (requires confirmation against the source standard, suspected to be Cr) GB/T 17476; Cu content GB/T 17476; Kinematic viscosity GB/T 265; ...1000 (requires confirmation against the source standard); ...GB/T 265; ...CEC-L-82-97; ...SH/T 0688. Note: *Only used for oil after the test.
• 11.4 Oil consumption: Report the oil consumption. The amount of oil collected in the blow-by system shall be recorded separately.
  • Formula (1): W = W₁ − W₂ − (W₃ − W₄)
    • W: Oil consumption, g
    • W₁: Initial oil added (test start), g
    • W₂: Weight after draining oil from the oil sump (test end), g
    • W₃: Weight of the oil filter (test end), g
    • W₄: Weight of the oil filter (test start), g
    • (source-text extraction Correspondence of subscripts requires confirmation against the source standard)

9. Qualitative and quantitative and calculation formulas

• Piston ring sticking evaluation: Evaluate according to SH/T 0264 Appendix... and 5.5 (see 11.1.1).
• Piston cleanliness evaluation: See Appendix B (normative appendix) Piston cleanliness evaluation method.
  • B.1 Scope: ... oil engine test piston cleanliness.
  • B.2 Purpose: This standard describes the method for evaluating the piston cleanliness of the MWM test. It is usually used to evaluate the piston after the test.
  • B.3 Method summary: The piston test can be judged by visual inspection of deposits (such as carbon deposits) and discoloration. The individual evaluation values are assigned according to the specified scheme.
  • B.4 Procedure: On the MA... test diesel engine, the specified test lubricating oil shall be evaluated for piston cleanliness according to the standard of visual evaluation. (source-text extraction unclear in the source text, requires confirmation against the source standard)
  • B.5 Piston... evaluation... the most important area of the piston—the piston ring area, shall be evaluated according to the conditions of the ring grooves and the ring grooves and ring lands, before evaluation, the first 3 ring grooves (starting from the crown... top ring groove) and the ring lands between the ring grooves. The top of the piston crown, the inner top and the... part may not be evaluated. (source-text extraction unclear in the source text, requires confirmation against the source standard)
  • B.5.1 Evaluation coefficient: For the bottom of each ring groove and the ring land, and when necessary for the skirt and the inner top of the piston (limited to rectangular marks on the back of the piston crown top), determine these... surfaces shall all use the same evaluation coefficient as the overall surface.
    • Clean... surface areas will be assigned according to the 100 rating coefficient
    • ... surface areas will be assigned according to the 30 rating coefficient
    • ... surface areas will be assigned according to the 65 rating coefficient
    • The evaluation of carbon deposits is assigned according to the -30 rating coefficient
  • B.5.2 Examples of ring groove carbon deposits are shown in Figure B.1 (piston, light carbon deposits, severe carbon deposits, cylinder block).
  • B.5.3 Rating: The principle of rating is according to B... part... proportion and its rating coefficient... the respective surface areas of cleanliness, blackening, discoloration and carbon deposits of each ring groove and ring land... the results are added to obtain the final comprehensive result. (source-text extraction unclear in the source text, requires confirmation against the source standard)
  • B.5.4 Example: Table B.1 and Table B.2 list... description examples of piston evaluations.
  • B.6 Expression of results: Add the results obtained for each, then average the evaluation results from ring groove bottoms 1 to 3 and ring lands 1, 2 to obtain an average value. The average value can be combined with the individual results to reflect. Table B.3 shows the results of the examples in Table B.1.
  • Table B.3 Example results (Evaluation location | Evaluation content | Evaluation coefficient | Product | Score): First ring groove bottom...; Second ring groove bottom...; Third ring groove...; First ring land...; Second ring land...; Piston inner top (rectangular)...; Piston skirt...; Average... (source-text extraction values severely unclear in the source text, requires confirmation against the source standard)
• The oil consumption calculation formula is given in Section 8 Formula (1).

10. Precision

• 13.1 Table 18 shows the reference oil test results made by I.S.P company from 2004 year 8 month to 2005 year 7 month.
  • Table 18 Precision of reference oil: CEC number...; Number of tests/times 19; Average piston cleanliness rating/points 66.2; Repeatability test/points 21 (requires confirmation against the source standard); Reproducibility test/points 3.7; Piston cleanliness rating control minimum/points 64; Piston cleanliness rating control maximum/points 68.
• 13.2 ... standard precision ... precision has not yet been established under the following, and after accumulating a certain amount of bench data, an appropriate precision requirement will be formulated. (source-text extraction unclear in the source text, requires confirmation against the source standard)
• 12.2.3 The calibration range of reference oil is shown in Table 17.
  • Table 17 Calibration range of reference oil: Reference oil model RI206; Repeatability test/points 3.7; Reproducibility test/points — (not provided in the available source); Piston cleanliness rating control minimum/points 64; Piston cleanliness rating control maximum/points 68.

11. Report

• 15.1 Contents of the test report
  • 15.1.1 Overall data: Test laboratory; Test bench number; Test start time; Test end time; Test run number; Break-in test oil number; Test oil number; SAE grade of the test oil to be tested; Fuel number including production batch number; Date and signature of the responsible test engineer.
  • 15.1.2 Test run: Running time; Operating conditions including the average value and standard deviation of the two-step test and all valid parameters in Chapter 10 (control and calibration values); Oil consumption of break-in test and formal test; Measure the axial clearance of the piston rings in the 1 and 2 ring grooves before the test run.
  • 15.1.3 Test results: Piston ring sticking score; 1, 2, 3 ring groove respective test results; 1, 2 ring groove average values; Piston cleanliness rating results; 1, 2 ring land, 1, 2, 3 ring groove respective test results; Average value of piston rating; Visual description; Bearing shells, cam, tappet, bearing and elastic crankshaft seal; Oil sample analysis including test methods.
• 15.2 Validity of the test: If the following occurs, the test will be considered invalid: The test was not carried out completely in accordance with the procedure.
  • Note: If a test is stopped due to ring sticking or excessive blow-by caused by ring sticking, and the requirements of clause A are not met, the results can be considered valid. The test report shall include the test run time and a description of all test parameters.

12. Reference documents

• GB 252 Light diesel fuel
• GB/T 261 Determination of flash point Pensky-Martens closed cup method (GB/T 261—2008, ISO 2719:2002 MOD)
• GB/T 265 Determination of kinematic viscosity of petroleum products and calculation of dynamic viscosity
• GB/T 268 Petroleum products — Determination of carbon residue (Conradson method) (GB/T 268—1987, EQV ISO 6615:1983)
• GB/T 380 Petroleum products — Determination of sulfur content (Lamp method)
• GB/T 386 Determination of ignition quality of diesel fuels (Cetane number method)
• GB/T 508 Petroleum products — Determination of ash (GB/T 508—1985, EQV GB/T 6245:1982)
• GB 1922 Solvent naphtha for paints and cleaning
• GB/T 6536 Petroleum products — Determination of distillation
• GB/T 7304 Petroleum products and lubricants — Determination of acid number (Potentiometric titration method)
• GB/T 7498 Coated abrasives — Sandpaper
• GB/T 15894 Chemical reagent — Petroleum ether
• GB/T 17476 Determination of additive elements, wear metals and contaminants in used lubricating oils and certain elements in base oils (Inductively coupled plasma atomic emission spectrometry)
• GB/T 19000 Quality management systems — Fundamentals and vocabulary (GB/T 19000—2008, ISO 9000—2005, IDT)
• GB/T 19001 Quality management systems — Requirements (GB/T 19001—2008, ISO 9001—2008, IDT)
• GB/T 27025—2008 General requirements for the competence of testing and calibration laboratories (ISO/IEC 17025:2005, IDT)
• JJF 1001 General metrological terms and definitions
• JJF 1059 Evaluation and expression of measurement uncertainty
• SH/T 0175 Determination of oxidation stability of distillate fuel oils (Accelerated method)
• SH/T 0246 Determination of water content in light petroleum products (Coulometric method)
• SH/T 0248 Determination of cold filter plugging point of diesel and domestic heating fuels
• SH/T 0264 Evaluation of high-temperature oxidation and bearing corrosion of internal combustion engine oils (Peter W-1 method)
• SH/T 0521 Ethylene glycol-based coolants for automobiles and light-duty engines
• SH/T 0604 Determination of density of crude petroleum and petroleum products (U-type vibrating tube method) (SH/T 0604—2000, ISO 12185:1996, EQV)
• SH/T 0688 Petroleum products and lubricants … determination method (Potentiometric titration method) (source-text extraction noise, requires confirmation against the source standard)
• CEC L-82-97 Determination of soot content in used engine oils — Spectrophotometric method
• ILAC-G2-1994 Guidelines for measurement traceability
• CEC L-78-99 (Part 9) Light-duty direct injection diesel engine oil ring sticking and piston cleanliness test method (adopting source standard)

13. Source and verification

This page is an AI translation of the available Chinese method card. Human verification is pending. It is not an official translation of the standard. Check the source standard and product certificate before use.

14. Quick Reference Q&A