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Author	Topic:   Uneven Compression Between Cylinders
placerville	posted 03-09-2006 09:58 PM ET (US)         I've seen a pair of 90 hp mercs for sale for what seems a reasonable price. However, one of the engines compression numbers are: 140, 140 and 100. Owner says they run fine. Without taking them to a mechanic, is the thought that this engine is on it's last leg and will take a chunk of money to fix it or could it be fine? Any advice would be appreciated. Matt
jimh	posted 03-09-2006 11:08 PM ET (US)             Read my article: Assessing Used Outboard Motors http://continuouswave.com/whaler/reference/outboardCheck.html It has specific advice on compression checks.
The Judge	posted 03-15-2006 03:14 PM ET (US)             Matt...she has a problem, or should I say HAD. That engine could run 10 years or 10 minutes with a low cylinder. If it was my personal engine I would run it to death. If I was looking to buy...pass.
Teak Oil	posted 03-15-2006 06:15 PM ET (US)             I agree An engine with 100psi on one cylinder would run just like one with even compression. Contrary to what some believe you cant tell the difference by ear. That cylinder may be at 100psi still in 20 years, but why take the chance?

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