PDA

View Full Version : 351w head gasket leak


mondos829
09-20-2013, 09:13 AM
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?


Sent from my iPhone using Tapatalk - now Free (http://tapatalk.com/m?id=1)

j.mccreight@hotmail.com
09-20-2013, 10:23 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, 07:26 AM
Is the oil milky looking?

mondos829
09-21-2013, 04:43 PM
It just started. So it's hard to tell if the oil is milky


Sent from my iPhone using Tapatalk - now Free (http://tapatalk.com/m?id=1)

CantRepeat
09-21-2013, 04:56 PM
It just started. So it's hard to tell if the oil is milky


Sent from my iPhone using Tapatalk - now Free (http://tapatalk.com/m?id=1)

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, 05:28 PM
did it look like this?? sorry to bring this memory back Too_Tall--- https://www.facebook.com/photo.php?v=1529299169046&set=vb.1731742052&type=3&theater

CantRepeat
09-21-2013, 07:00 PM
did it look like this?? sorry to bring this memory back Too_Tall--- https://www.facebook.com/photo.php?v=1529299169046&set=vb.1731742052&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, 10:53 AM
A thread you might find helpful.

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