- Open the filler cap and check the sealing gasket for porosity and damage.
- Check the ventilation system hose for secure fastening at the filler cap and air filter.
- Cylinder head cover seals.
- Cylinder head gasket.
- The place where the ignition distributor flange is connected.
- Oil filter sealing gasket: oil filter bracket flange on cylinder block and oil filter flange on bracket.
- Hydraulic switch (o-ring seal).
- Drain plug (o-ring seal).
- Oil pan sealing gasket.
- The point where the gearbox is attached to the engine (sealing gasket at the flywheel or at the gearbox shaft).
- Seals of camshaft, intermediate and crankshaft (from the engine toothed belt side).
Since the oil usually spreads over a large area when there is a leak, it can be quite difficult to determine the leak location at first glance. When searching for leak locations, it is advisable to proceed as follows:
Wash the engine. Spray the engine with a standard cleaning agent and after a while rinse everything off the engine with a stream of water. Cover the ignition distributor and generator with polyethylene film beforehand.
Sprinkle the connection points and seals on the outside of the engine with chalk or talcum powder.
Check the oil level and top up if necessary.
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Perform a test drive. Since the oil in a hot engine becomes liquid and therefore leaks out faster, it is recommended to perform a test drive on a section of approximately 30 km on a high-speed highway.
Finally, inspect the engine using a lamp, find any leaks and troubleshoot.
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