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Author Topic:   Is this compression OK?
ewalsh posted 06-26-2002 01:59 PM ET (US)   Profile for ewalsh   Send Email to ewalsh  
1988 Mercury 200hp.

Five cylinders @125. One at 95. Measurements taken after engine was run on muffs for about 30 seconds, so the engine was pretty cool.

Is this a time bomb?

Thank you! Ed

Bigshot posted 06-26-2002 02:52 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Do an engine decarb and see if it increases. i assume you checked that cyl more than once. If it does not come up ANY after a decarb.....tic....tic....tic
Chris J posted 06-27-2002 12:12 PM ET (US)     Profile for Chris J  Send Email to Chris J     
The 95 lb cylinder has a problem. Decarb may help but I'd be surprised, since just one cylinder is low. You may just have a bad head gasket, or (much worse) a problem with the cylinder itself.

How do the plugs look?

Chris J posted 06-27-2002 12:15 PM ET (US)     Profile for Chris J  Send Email to Chris J     
By the way, I wouldn't recommend ignoring the problem. If it is a bad head gasket you can probably live with it awhile but if the cylinder is on the way south it could make the repair more expensive if it isn't fixed soon.
Bigshot posted 06-27-2002 12:19 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Good point Chris. I am not sure if that engine has head gaskets per say. Many Mercs just have a water jacket gasket so low means....tic...tic...tic....Boom!
David Ratusnik posted 06-27-2002 06:37 PM ET (US)     Profile for David Ratusnik  Send Email to David Ratusnik     
Test compression again. Reliability check. David

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