On Jul 4, 8:53*am, Carl Fredrik wrote:
Hi everyone,

I've tried for hours to find the correct cylinder compression for my
Mercruiser 3.0L -88, but I just can't seem to find it anywhere. I saw
similar engines rated at 130 PSI from the factory, but if anyone could
give me an authoritative answer on this particular engine, I would be
very grateful.

I just did a compression check on my engine, and get the following
results: 120, 120, 120, 180 PSI. I have little experience with this,
so I would appreciate any advice or comments on how to remedy this
situation.

Sincerely,

Carl, Sweden

120 across the board should be considered good, but if you have 180 on
one cylinder I would think that a bit odd. usually it would be lower,
but I would consider at 180 would suggest some major carbon build up
on that one cylinder.


I'll see if I can find my Mercruiser shop manual and see what the
specifications are.