What is the most common cause of blue smoke coming from a deisel engine?
Deisel blue smoke
Oct 28, 2003
4 Replies
Depends on the engine i guess, but the same things as a petrol engine, rings, valve guides, value guide oil seals etc etc etc
JH
Oil burning. Probably valve guides if it's on startup.
Yeah, what he said, but could be turbo bearings too.
-- James
First off, to reiterate what the other guys said. :)
Secondly, and apologies if you know this, if you're only getting this smoke at start up, are you sure that it's bright blue in colour? A bluey grey white haze of smoke is quite normal for many diesels - it's unburnt diesel - and an increase of this smoke in conjunction with harder starting usually means that it's dropped one or more glow plugs.
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