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1996 mercruiser 120 #4 cyl very high compression

robbie

New member
looking at a bayliner jazz je

looking at a bayliner jazz jetboat with a 120 mercruiser same as a force engine i think.engine has even compression across board except for #4 cylinder it is 180psi compared to the others at 120psi.guy says water is getting into #4 cylinder and is causing problem says it is common among these types of engines and estimates repair at $200-400.any input appreciated.
 
ROBBIE

IS THE MOTOR FRESH


ROBBIE

IS THE MOTOR FRESH WATER COOLED? IF NOT HOW CAN WATER GET INTO #4 ON A COMPRESSION TEST UNLESS YOU'RE TESTING IT IN THE WATER?????????

TRY ANOTHER GUY.

SMC
 
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