Piston rings
Piston rings
Author
Discussion

TOPTON

Original Poster:

1,514 posts

265 months

Tuesday 27th September 2005
quotequote all
Not my S2 thankfully. My sons 1.5Lsi civic was blowing loads of blue smoke out the tail pipe. Two possible answers-valve stem seals or piston rings. Got the engine striped out now. I remember something about putting WD40 or the like in the bores to see if it soaks away to check if the rings are worn. Does this sound correct? Maybe I am remembering something totally wrong. Thoughts would be appreciated..T

Edited to say: just thought I should maybe have put this on the engine & drivetrain section

>> Edited by TOPTON on Tuesday 27th September 18:35

bugsy

1,371 posts

265 months

Tuesday 27th September 2005
quotequote all
My old test was to do a dry compression test and then squirt a bit of engine oil down the bore and retest.
Obviously, if no difference, valves, if a difference, rings

ceejay73

489 posts

257 months

Wednesday 28th September 2005
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Usually if it is valve stem seals the car will smoke when first started but then clear once the oil that has seeped through is burnt off. Would think the seals and guides would have to be very worn to cause it to blow a lot of smoke all the time.

Carl.

bugsy

1,371 posts

265 months

Wednesday 28th September 2005
quotequote all
I have just remembered that this was a secondhand engine you bought.
I wonder if it was hanging around for a while and the valve seals went hard, or oil rings are gummed up.
Maybe a dose of redex could help if it's rings.

TOPTON

Original Poster:

1,514 posts

265 months

Wednesday 28th September 2005
quotequote all
Think I had already decided it was the rings, far too much smoke for the stem seals. Wanted someone to tell me what I already knew. Trying too source gasket set for rebuild now. Cheers all!