ASTM D6618 Standard Test Method for Evaluation of Engine Oils in Diesel Four-Stroke Cycle Supercharged 1M-PC Single Cylinder Oil Test Engine
10.1 Engine Break-in - Weigh in 4.8 +/- 0.11 kg (10.6 +/- .25 lb) of oil. For non-reference tests, take a 240 mL (8 oz) sample of the oil for use in the 40°C initial viscosity measurement reported on the Operational Summary form of the test report. Perform break-in per Table 6. When the cooldown is complete and the engine is still hot, drain the crankcase, governor housing, oil cooler, and lubricating oil filter housing for 30 min. Use the drain cocks provided.
10.2 Pre-Test Preparations:
10.2.1 Weigh 4.8 +/- 0.11 kg (10.6 +/- 0.25 lb) of oil into the engine.
10.2.2 Perform warm-up as described in 10.3.
10.3 Warm-up Procedure:
10.3.1 Perform Steps 1, 2, and 3 of Table 7 for all starts except break-in.
10.3.2 When finished with warm-up, turn on inlet air heating elements and bring stand to test conditions (see Table 1).
10.4 Operating Conditions - During this test, target all controlled parameters to the specified mean. Run the engine continuously for 120 h at the conditions shown in Table 1.
10.5 Periodic Measurements:
10.5.1 Except engine air flow rate, record the parameters listed in Table 1 hourly as snapshots. Record values as found before adjustments are made to correct to the specification mean. These recorded values show the engine conditions actually present at each hour of the test. (They are not averages computed from data logged during the test hour.) Make corrections to each hourly humidity reading for nonstandard barometric conditions, using additive correction factors derived from the perfect gas law equation (see 9.6.2).
10.5.2 Also record and report the following data:
10.5.2.1 Crankcase blowby, m 3/h (ft3/h), once each 12-h period. (A minimal increase in crankcase pressure is allowed for a time period no greater than 4 min when switching from a normal operating system to the blowby measuring system.)
10.5.2.2 Engine load (should be approx. 31.3 kW or 42 bhp).
10.5.2.3 The weight of all oil added and drained and the engine hours at that time.
10.5.2.4 Document instances of missing or bad test data in the comments section of the Unscheduled Downtime and Maintenance Summary form of the test report. If a test has greater than 4-h data acquisition on any controlled parameter, the test is operationally invalid. Note any alternate method of data acquisition in the comment section of the Unscheduled Downtime and Maintenance Summary form of the test report.
10.6 Engine Oil Level - With the bayonet oil level gage housing lowered, use the following procedure for measuring the crankcase oil level:
10.6.1 Withdraw the bayonet gage and wipe free of oil.
10.6.2 Insert the bayonet gage with the numerals facing the operator.
10.6.3 Count off 5 s.
10.6.4 Withdraw the bayonet gage and read the oil level.
10.7 Oil Addition Procedure - Use the following steps when making oil additions:
10.7.1 At the end of the run-in, drain all the engine oil for 30 min and weigh in 4.8 +/- 0.11 kg (10.6 +/- 0.25 lb) of fresh oil.
10.7.2 During the first hour of the test, when the oil temperature reaches 96 +/- 2.8°C (205 +/- 5°F), record the crankcase level as the Full Mark.
10.7.3 Calculate the following levels:
10.7.3.1 Drain Level is two units below the Full Mark.
10.7.3.2 Low Level is two and one-half units below the Full Mark.
10.7.3.3 Emergency Add Level is three units below the Full Mark.
10.7.4 At the end of each 12-h period, check the crankcase oil level and perform the following:
10.7.4.1 If the oil level is above the Full Mark, drain to a level of Drain Level and weigh in 0.8 +/- 0.22 kg (1.76 +/- 0.05 lb) of fresh oil.
10.7.4.2 If the oil level is between the Full Mark and the Drain Level, drain oil from the engine until the oil level is at the Drain Level. Add 0.8 +/- 0.22 kg (1.76 +/- 0.05 lb) of fresh oil.
10.7.4.3 If the oil level is between Drain Level and Low Level, add 0.8 +/- 0.22 kg (1.76 +/- 0.05 lb) of fresh oil.
10.7.4.4 If the oil level is below the Low Level, add enough oil to the engine to bring it up to the Full Mark.
10.7.5 If the oil level falls below the Emergency Add Level at any time during the test, add 0.8 +/- 0.22 kg (1.76 +/- 0.05 lb) of fresh oil.
10.8 Cool-Down Procedure - Except for emergency (uncontrolled) stops, use the following procedure prior to all engine shutdowns including the break-in: Stop counting test time at the start of Stage 3 in Table 8. Turn off all heater elements and let air temperature cool normally.
10.9.1 For all occurrences, report the test hours and length of time down on the Unscheduled Downtime and Maintenance Summary. If the cool-down procedure is not used, identify the shutdown as an emergency shutdown. In the event of an emergency shutdown, maintain a 2-h off-test condition for engine cooling before restarting. Maximum allowable downtime for the duration of the test is 125 h. Minimize the total downtime of the test. To protect deposits, rotate the engine to top dead center of the compression stroke during shutdowns.
10.9.2 An excessive number of emergency or regularly scheduled shutdowns that reasonably could have been prevented will influence test acceptability. Pre-arrange schedules for tests with planned shutdowns (for reasons other than those normally permitted) with the TMC.
10.10 Fuel System - Bleed the fuel lines free of air prior to each test or if fuel is drained from the engine fuel system for any reason.
10.11 Brake Specific Oil Consumption (BSOC) Calculation - Calculate the BSOC for the test as follows:
[(sum of adds) - (sum of drains)]/(120 x average engine power)
BSOC greater than 1.216 g/kW-h (0.002 lb/bhp-h) will invalidate the test. Plot each 12-h oil consumption point and include as the Oil Consumption Plot form of the test report.