- Open the filler cap and check the seal for porosity and damage.
- Ventilation hoses from the filler cap to the air filter.
- Cylinder head seal.
- Cylinder head cover gasket.
- Cylinder head seal.
- Place of connection of the ignition distributor flange.
- Oil filter seal Oil filter on cylinder block flange.
- drain plug (sealing ring).
- Oil pan sealing gasket.
- Connection between engine and gearbox (oil seal on the side of the flywheel or the drive shaft of the gearbox).
Attention: Leaks in the front area of the engine can be caused by tightening the crankshaft cover and/or intermediate shaft bolts to too low a torque. In this case, tighten the bolts with a torque of 15 to 20 Nm.
Since oil usually spreads over a large area in case of leaks, it can be quite difficult to determine the location of the leak at a glance. When looking for leaks, it is advisable to proceed as follows.
Wash the engine. Spray the engine with a standard cleaning agent and after a while wash everything off the engine with a jet of water. Pre-cover the ignition distributor and generator with plastic wrap.
Sprinkle joints and seals outside the engine with chalk or talcum powder.
Check oil level, top up if necessary.
Carry out an inspection trip. Since the oil becomes liquid in a hot engine and therefore flows out faster at leaks, it is recommended that the test drive be carried out over a section of about 30 km on a highway.
In conclusion, inspect the engine using a lamp, find leaks and troubleshoot.
Note: Oil leaks on the right side of the cylinder head gasket can be caused by leaks in the three lower rear intake manifold mounting studs. In this case, unscrew the 3 studs, clean the threaded holes and reinstall the studs with Hylomar sealant.
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