Contents: External inspection ↓ Compression check ↓
External inspection
An oil leak is checked for an engine that is splashed with oil and has high fuel consumption. The following areas and zones are checked:
- Open the oil filler cap and check its gasket for porosity and damage.
- Check the tightness of the ventilation hose between the cylinder head cover and the air filter.
- Cylinder head tightness.
- Tightness of the ignition distributor mount.
- Tightness of the oil filter flange fastening to the engine block and the oil filter to the flange.
- Oil pressure sensor (sealing ring).
- Oil drain hole (sealing ring).
- The joint between the engine and the gearbox (oil seal on flywheel or gearbox shaft).
- Seals of camshaft, intermediate and crankshaft (from the engine side).
Since the oil spreads in large spots after depressurization, it is very difficult to immediately determine the leakage location, so it is recommended to search specifically, as indicated below:
- Wash the engine with commercially available products, rinse it with water after a short time, after covering the ignition distributor and generator with plastic bags.
- The joints and gasket installation areas 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, you can quickly identify leaks after driving about 30 km on the highway.
The original article is available on the website [VWmanual.ru]
Inspect the engine with a lamp, locate the leaks and eliminate the causes.
Compression check
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 heavily worn. In addition, the check shows whether the engine is subject to replacement or repair. A compression tester is required for checking.
The difference in pressure between individual cylinders should not be more than 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 mirrors. When the wear limit is reached, the engine must be repaired or replaced.
Compression for 1.8 l engines should be 10-13 (1.6 l and 1.8 l/90 hp - 9-12) kg/cm². The minimum permissible value is 7.5 kg/cm².
To check the compression, the engine must be warm. Remove all spark plugs. Connect the compression gauge according to the instructions.
Press the accelerator pedal fully and hold it throughout the entire test.
Crank the engine approximately 8 revolutions until the instrument scale shows a constant compression reading.
Check all cylinders in sequence and compare readings.
Once finished, screw in the spark plugs and connect the high-voltage cables to them.
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