Compression

S

Schnidly

Petty Officer 2nd Class
Joined
Aug 12, 2001
Messages
143
Hi Forum, I own a 90hp 3 cylinder 1988 Mercury outboard, the serial number is: 0B302485. I did a compression check on the 3 cylinders and got 89psi on top, 90psi on middle and 89psi on the bottom cylinder. Dont think my gauge is the top of the line so can someone give me some insight as to if these are good readings?
 
K

kazek

Petty Officer 2nd Class
Joined
May 14, 2011
Messages
193
Re: Compression

readings are on the low end ,but they are close to each other and thats good.if you had all the plugs remowed and throtlle way up that the way.engine should be warm also
 
S

Schnidly

Petty Officer 2nd Class
Joined
Aug 12, 2001
Messages
143
Re: Compression

I left the other two spark plugs in while I tested each cylinder for compression, the engine was cold also and I pulled the lanyard on the kill switch so the engine would not start nor spark while testing. Should I warm the engine up and remove each spark plug and retest?
 
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