The car during the control race must be technically sound. The oil level in the crankcase must be between the marks "MAX" And "MIN" engine oil level gauge.
Before the control run, it is necessary to warm up the engine; before draining, the oil temperature should be 80-85°C. Drain the oil on level ground, set the piston of the first cylinder to TDC, the filler cap must be open.
Drain the oil from the sump within 15 minutes. Determine the weight of the drained oil.
To eliminate the impact on the result of measuring the performance of the oil filter anti-drain valve, it is necessary to determine the weight of the oil filter with oil before and after the test, while eliminating oil spillage when dismantling the filter.
Enter the weight of the oil filled into the crankcase, including the weight of the oil filter with oil, on the record.
After a road test under the above conditions, re-determine the oil weight (including the weight of the oil filter with oil).
Having obtained the value of the total oil consumption, calculate the specific oil consumption in l/1000 km.
If the value of the specific oil consumption is within acceptable limits, make a note in the service book indicating the protocol number and in the log of rejected claims, give the second copy of the protocol to the owner.
The oil consumption rate is 0.5 l/1000 km or 0.4% of fuel consumption.
Attention! Consumption of fuels and lubricants is given for the summer season (from 20 to 30°C) and a serviceable car after running in (from 3000 to 15000 km). The operating fuel consumption rates may differ significantly from those given above, because they depend on road and weather conditions, loading and availability of additional equipment.
Attention! The consumption rate is given for warmed-up run-in vehicle components, when driving in fourth gear at speeds up to 90 km / h on an asphalt road, without engine braking. Car load - 2 people without cargo and additional roof rack.
The control run should be carried out in controversial cases in the absence of obvious signs of increased oil consumption: external oil leaks, low compression, smoky exhaust.
The main causes of increased oil consumption are as follows:
- 1. External oil leakage through seals, gaskets, seals.
- 2. Clogged crankcase ventilation system
- 3. Coking of slots in oil scraper rings or grooves in piston grooves due to the use of non-recommended oil
- 4. Worn or damaged valve stem seals
- 5. Increased wear on valve stems or guide bushings
- 6. Broken piston rings
- 7. Abrasive wear of cylinders, piston rings, pistons, guide bushings (in this case, the defect is eliminated at the expense of the owner).
- 8. Wear of piston rings (no cylinder wear), excessive thermal clearance of the rings, coincidence of the locks of the rings in a line, non-adherence of the rings to "mirror" cylinders, a large gap in the height of the rings in the piston grooves.
- 9. Seizures, risks, rubbing and other defects on "mirror" cylinders.