Weekly Checks – Oil Leaks

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Engine – Oil Leaks – Rear Main Seal
The rear main seal is at the rear of the crankshaft, sealing the oil inside the engine and preventing it from leaking outside the rear of the crankshaft. The rear main seal is designed to last at least 100,000kms. Unfortunately, with a longitudinal motor, rear main seals may only last 60,000-80,000kms.


When checking for oil leaks it’s always good to check underneath the vehicle around the rear of the engine, making sure it is around the rear main seal and not around the top of the head. Sometimes a leaking rocket cover gasket may be the cause, if after replacing the rear main seal, there is still oil leaking. The best way to check any seal is to give the engine a complete steam clean but be very careful not to spray the steam around any ignition componentry or carburettor as this will affect the ignition system and also may cause a non start.


The rear main seal itself costs around $15.00 but the labour can cost around $350.00 as it can be a full day’s job with some vehicles, because either the engine or the transmission has to come out, to replace the seal. Some rear main seals may cost $700.00 depending on the type of seal fitted. It may be a sealed unit or a wick seal. A wick seal is the worst seal because it is very difficult to fit and to ensure that there is no leaking.


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