N54 Engine, white smoke, misfire
Hello guys,
I have 2008 BMW 535i with N54 engine, manual transmission. When the previous owner detected an extreme white smoke coming out of the car’s exhaust, he stopped driving and towed the car to his mechanic who diagnosed the head gasket failure, also misfire in the cylinder 2 and 5. Me and my friends bought the car expecting the head gasket to be blown, but after taking the engine apart and removing the engine block, we were confused by what we found inside, the head gasket seems to be intact. On the early stage of taking removing the engine we found a jelly like substance in the car’s coolant system. it seems like two different coolants were mixed together which formed white jelly like substance, clogging the system, but after examining the head gasket we don’t see any damage to it. So now we are confused, having hard time deciding which is the best, putting car back together with a new head gasket, cleaned coolant system and new injectors or we need some more advanced work done on the engine block and other parts.
P.S We also tested the water pump and it was in good working condition.
Please see the images attached below.
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