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-   -   351w head gasket leak (http://www.mastercraft.com/teamtalk/showthread.php?t=57496)

mondos829 09-20-2013 08:13 AM

351w head gasket leak
 
Boat is a 1976 SS with a 351w. That boat sound like it has a cylinder missing. But when that boat gets upto temp and the thermostat opens steam is coming out if the PCV valve. Would this typically be a head gasket leak?


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j.mccreight@hotmail.com 09-20-2013 09:23 PM

Anything is possible. I would start with a compression test followed by a cylinder leakdown test, loads of info on diagnose.

CantRepeat 09-21-2013 06:26 AM

Is the oil milky looking?

mondos829 09-21-2013 03:43 PM

It just started. So it's hard to tell if the oil is milky


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CantRepeat 09-21-2013 03:56 PM

Quote:

Originally Posted by mondos829 (Post 980068)
It just started. So it's hard to tell if the oil is milky


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Drain the oil and cut open the filter. You'll know if there is water getting into the oil.

If there is no signs of water in the oil and you say you have steam coming out the PVC valve I'm gonna say that it's probably not steam. Its more then likely oil passing up past a piston.

mikeg205 09-21-2013 04:28 PM

did it look like this?? sorry to bring this memory back Too_Tall--- https://www.facebook.com/photo.php?v...type=3&theater

CantRepeat 09-21-2013 06:00 PM

Quote:

Originally Posted by mikeg205 (Post 980073)
did it look like this?? sorry to bring this memory back Too_Tall--- https://www.facebook.com/photo.php?v...type=3&theater

Yup, after the compression check he'll see that one or more is low and I'd bet the top of the piston in that cylinder is missing.

CantRepeat 09-22-2013 09:53 AM

A thread you might find helpful.

http://www.mastercraft.com/teamtalk/...ad.php?t=44049


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