Thread: Too much crankcase pressure, novice engine builder

Tweet

which two cylinders had the low pressure??????? Please post a list of all 8 cylinders--------

Originally Posted by jerry clayton

which two cylinders had the low pressure??????? Please post a list of all 8 cylinders--------

WOW Jerry, I totally misread two cylinders! If they are adjacent each other you are correct, it would most likely be a blown head gasket, GREAT CATCH!! It would explain everything, and SBC are especially prone to the center two cylinders with their exhaust ports so close.

Might be an easy fix after all..

oil was completely clean when I drained it, and smoke was oil smoke. I'd be surprised of a bad gasket

Originally Posted by NegativeZero

oil was completely clean when I drained it, and smoke was oil smoke. I'd be surprised of a bad gasket

You can blow a head gasket between cylinders but not compromise the coolant passages. What 36 sedan and Jerry are telling you is that by not checking all cylinders and also doing the leakdown test you may be overlooking an easy fix that saves you money. Remember 36's second rule?

Originally Posted by 36 sedan

TROUBLESHOOTING - Test, test, test, SPEND less, less, less

Of course you may have already pulled the engine by now..... Hope you find your problem, and that you share what you find.

Originally Posted by jerry clayton

which two cylinders had the low pressure??????? Please post a list of all 8 cylinders--------

cyl.....1st test......2nd test
1.......135............didnt test
2.......130............100
3.......139............70
4.......132............133
5.......133............didnt test
6.......137............didnt test
7.......125............didnt test
8.......144............134

Once I saw 2 of the 8 cylinders as low as they were, I was cracking this open and didn't even bother with the rest of the cylinders. The engine bay has already been torn down, I just have to lift it out of the car tomorrow.