Visual inspection
An oil-splattered engine with high fuel consumption is checked for oil leakage. The following places and zones are checked:
- Open the oil filler cap and check the gasket for porosity and damage.
- Check the tightness of the ventilation hose between the cylinder head cover and the air filter.
- The tightness of the cylinder head.
- Tightness of fastening of the distributor of ignition.
- The tightness of the oil filter flange to the engine block and the oil filter to the flange.
- Oil pressure sensor (sealing ring).
- Oil drain hole (sealing ring).
- Joint between engine and gearbox (oil seal on flywheel or gearbox shaft).
- Camshaft, intermediate and crankshaft seals (from the engine side).
Since the oil spreads in large spots after depressurization, it is very difficult to immediately determine the place of leakage, therefore it is recommended to search purposefully, as indicated below:
- Wash the engine with commercially available products, after a short time rinse it with water, after covering the ignition distributor and generator with plastic bags.
- Places of joints and installation of gaskets on the engine must be sprinkled with lime or talc.
- Check the oil level, add oil if necessary.
- Take a test drive. Since hot oil is more fluid, leaks can be located more quickly immediately after driving about 30 km on the highway.
Examine the engine with a lamp, localize the leaks and eliminate the causes.
Compression test
It allows you to draw a conclusion about the condition of the engine, as it makes it possible to determine whether the valves and pistons are in good condition (piston rings) Or they are very worn out. In addition, the check shows whether the engine needs to be replaced or repaired. A compression gauge is required to check.
The difference in pressure between the individual cylinders must not exceed 3.0 kg/cm2. If the difference in pressure of one or more cylinders relative to others is more than 3.0 (diesel 5.0) kg/cm2, this indicates defective valves, worn piston rings or cylinder bore. When the wear limit is reached, the engine must be repaired or replaced.
Compression for 1.8 liter engines should be 10-13 (1.6 l and 1.8 l / 90 hp - 9-12) kg/cm2. The minimum allowable value is 7.5 kg/cm2.
The engine must be warm to check compression. Remove all spark plugs. Connect the compression gauge according to the instructions.
Fully depress the accelerator pedal and hold for the entire test.
Turn the engine about 8 revolutions until a constant compression value is set on the gauge dial.
Check all cylinders in sequence and compare readings.
When finished, screw in the spark plugs and connect the high voltage cables to them.
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