1978 Merc 150HP compression results

B

bazeven

Cadet
Joined
Aug 16, 2005
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8
The below are the results of a compression test ran on a motor that I'm looking to buy. Is this good or something I should stay away from. <br /><br />The motor is a V-6, not an in-line 6 and here is the compression test: #1 - 115; #2 - 115; #3 - 115; #4 - 125; #5 - 122; and #6 - 118. <br /><br />Thanks. <br /><br />bz
 
O

OperativeK

Petty Officer 2nd Class
Joined
Apr 21, 2005
Messages
154
Re: 1978 Merc 150HP compression results

I would believe the 118 and 115 are low and you might want to go ahead open her up or take a peak and see if there is scoring.
 
K

KCLOST

Commander
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Jun 22, 2002
Messages
2,095
Re: 1978 Merc 150HP compression results

Not bad, you want to see them all withing 10% of each other...
 
C

Coolmaker

Petty Officer 2nd Class
Joined
Mar 15, 2005
Messages
134
Re: 1978 Merc 150HP compression results

Those are not bad numbers, Allot of shops have a camera with a small eye that they can put through the spark plug hole and see the cyl. walls. Removes any doubt of scoring......
 
W

wilde1j

Vice Admiral
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Apr 15, 2002
Messages
5,964
Re: 1978 Merc 150HP compression results

Those are OK numbers for that motor.
 
timmathis

timmathis

Lieutenant
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Apr 24, 2005
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1,295
Re: 1978 Merc 150HP compression results

If you buy it, One of the first things I would do is try some ring free. (It may help bring your #s up a little.) Good Luck, Tim
 
Clams Canino

Clams Canino

Commander
Joined
Jan 10, 2004
Messages
2,179
Re: 1978 Merc 150HP compression results

Agreed - a de-carboning (like Mercury Power Tune) is clearly indicated here as a 1st try.<br /><br />-W
 
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