My 240d has over 180k miles and has a fair cloud of smoke with the oil filler cap removed. Last I checked all cylinders compression was around 350. Oil, filters, injector cleaner, valve adjustment, sustained hi way driving all played a part in better performance but did nothing for blow by. I'm thinking about a ring job and wondering what the general procedure is and what the possible scenarios are. Best case, new cylinder liners, rings, timing chain or ? Thanks, Noche
240d ring job
Feb 02, 2009
2 Replies
With 350 PSI all around, I doubt it is blow by. It is more likely to be your valve stem seal that is the issue.
If you are going to do the ring job, then you need to have the machine shop check for out of roundness... then they would either bore it out and resleave it... by this time, you might as well do the complete engine overhaul.
You should check your PCV system to make sure everything is working there.
Other than seeing "blowby" with the oil cap off, is there anything wrong with your engine? Is it using oil? These engines normally appear to have blowby with the oil filler cap off, but this in itself doesn't mean anything.
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