Too much blowby
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Junior User
Joined: Apr 2005
Posts: 71
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From: East Tenn.
Too much blowby
83 F100 302 has so much blowby that i have to unhook the blowby hose from my air cleaner because it's saturating the air filter. I've chanbed the pcv valve for the 2nd time to make sure that wasn't it.
Blowby is a good indication that the rings are bad, but I did a compression check and got 135 on all of them. I don't understand how there's so much blowby with that good compression.
Blowby is a good indication that the rings are bad, but I did a compression check and got 135 on all of them. I don't understand how there's so much blowby with that good compression.
Freshman User
Joined: Aug 2005
Posts: 32
Likes: 0
From: Salem, VA
Blowby
I also had a significant blowby problem on my 1986 302.
The compression check was good, but I tore the engine anyway and found all the oil rings frozen, #8 cyl was the worst.
After the rebuild I moved the PCY return to the middle of the intake as recommended by many on this forum.
Problem solved and engine runs stongly.
Good luck.
The compression check was good, but I tore the engine anyway and found all the oil rings frozen, #8 cyl was the worst.
After the rebuild I moved the PCY return to the middle of the intake as recommended by many on this forum.
Problem solved and engine runs stongly.
Good luck.
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