Peugot 405 estate diesel turbo n reg
Sounds like a blown cylinder head gasket between the water and oil passages and galleries. Is the amount of oil significant..not just a hint of a film? Do you have any sign of creamy looking 'mayonnaise' on the under side of the oil filler cap and entrance? This would be sign of the reverse i.e. that water had got into the oil. The oil in the engine is driven around the galleries under pressure, certainly more pressure than the coolant, so if there is a connecting leak oil will be forced through it into the coolant. The best way to make sure is to have your coolant system pressure checked by you local garage when the engine is really cold. With the engine off and the oil filler cap removed a leak will be indicated by the coolant pressure dropping slowly (as water is forced through the leak back into the oil system). Also monitoring the pressure of the coolant when the engine is started from cold will also reveal a leak. The coolant is at normal atmospheric pressure when cold and only when the engine gets hot does the pressure within the coolant system rise (somewhere between 7 - 10psi depending on power unit). However if there is a leak the pressure of the coolant will rise rapidly as the oil system reaches pressure quickly, in other words the coolant system will be forced to the same pressure as the oil system through the leak. The remedy is to renew the head gasket.
Apr 16, 2010 |
1990 Peugeot 405