0 compression #4 cylinder Mercruiser 5.7 1988 Rinker

Donbaycity

Recruit
Joined
Aug 22, 2016
Messages
1
Overheated, replaced thermostat, changed oil and plugs. Plugs all looked just burnt, no water in cylinders and oil looks fine.. Any ideas. Appreciate your time..
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
51,943
time to perform a leak down test to determine if the issue is valves, head gasket, or piston/rings
 

tpenfield

Moderator
Staff member
Joined
Jul 18, 2011
Messages
18,874
Let us know what the other cylinders were for compression. 0 psi is not good. :eek: Tell us a little more about how the engine was running, etc. before the overheat and anything that may have caused it to overheat.
 
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