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

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.

On Sat, 4 Jul 2009 09:37:25 -0700 (PDT), Tim
wrote:

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

In addition to a lower psi limit, there is usually another spec that
says all cylinders should be within 10 or 15 psi of each other.

"Carl Fredrik" wrote in message
...
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

The 180 is abnormal. May be some water in that cylinder. What ever, that
is the problem cylinder.