Question about BMW 318

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My BMW (1996) e35 318i engine has excessive blow-by thus it blow fumes out of the brather pipe and out of the unit the dip stick goes in if I pull the dip stick out. I have ben told that the rings need to be replaced although the car does not smoke. This extra air is causing pressure in the oil chambers and thus the car is leaking oil out of one of the gaskets. I am also worried that it would cause too much pressure on a long trip and blow up the engine or something although the engine does not overheat and the oil leak is severe. Since an engine rebuild is too expensive for me at the moment, a mechanic friend will do the work and I will get rings and a gasket kit. Hopefully the piston heads and cylinders are ok although the head might need to be skimmed. The bearings sound fine. Is there any other cause of blow-by and if we replace he rings, skim the head and replace all the gaskets would it solve the problem?

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  • webdude2000 Aug 07, 2010

    Thanks, it has no bearing knock, is not smoking and does not use much oil, the buit of oil loss is more from the timing cover gasket that is leaking. I will replace the PCV valve (not sure what that is yet) and have a compression test done.

  • webdude2000 Aug 07, 2010

    is this the crankcase PCV Vent Valve like this one?



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First thing to do is replace the PCV valve. Next thing is have a compression test run on all cylinders. This will tell you just how much wear there is. If there is just normal wear and the engine is not using allot of oil and is running fine then you can continue to drive it with no worries of it blowing up the engine. I can assure you the bearings are worn so there is no way I would go to all the trouble of removing the pistons and replacing the rings without doing a complete overhaul including replacing all the bearings. You need to have the heads planed and the cylinders may need to be trued in order to overhaul the engine correctly. You can then be assure of many more miles with this engine. My advice is have this looked at by a trusted mechanic who can tell you exactly what you need to do and what it will cost. Do not do a partial overhaul and leave the old bearings in place. In fact as I have said if it is running ok with no knocks and it not using an excessive amount of oil, just keep driving it.

Posted on Aug 07, 2010

  • NOT ME Aug 07, 2010

    Yes, that is exactly what you need to replace. You might also consider replacing the timing cover gasket to stop that leak. Sounds to me like you really do not have a critical problem and have time to consider what you want to do.



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