Crankcase pressure issues
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Crankcase pressure issues
I have a 1977 f250 with a 400m. i keep having issues with blowing out my valve cover gaskets every couple hundred miles, ive tried cork, and rubber gaskets, ive been able have the cork last a little longer than the rubber gaskets though
Postmaster
Joined: Mar 2011
Posts: 2,698
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From: Taxachusetts
First, and no offence, it's a 400, plain Jane 400... not 400m....you have a 351M, 351C and the 400.
Onto the issue at hand: Do you have a clean PVC unit hooked up, and a clean valve cover breather?
Are your valve cover bolts just a little tighter than finger tight? I think 5 -7 inch lbs.
If they're too tight, they'll disform the valve cover and crush the gasket too much, allowing leakage.
Do you have any kind of oil spew from the dipstick?
Onto the issue at hand: Do you have a clean PVC unit hooked up, and a clean valve cover breather?
Are your valve cover bolts just a little tighter than finger tight? I think 5 -7 inch lbs.
If they're too tight, they'll disform the valve cover and crush the gasket too much, allowing leakage.
Do you have any kind of oil spew from the dipstick?
Postmaster
Joined: Mar 2011
Posts: 2,698
Likes: 7
From: Taxachusetts
Do you still have the EGR hooked up/workable? Is it free of that hardened carbon buildup in the plate?
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Postmaster
Joined: Nov 2011
Posts: 2,553
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First, and no offence, it's a 400, plain Jane 400... not 400m....you have a 351M, 351C and the 400.
Onto the issue at hand: Do you have a clean PVC unit hooked up, and a clean valve cover breather?
Are your valve cover bolts just a little tighter than finger tight? I think 5 -7 inch lbs.
If they're too tight, they'll disform the valve cover and crush the gasket too much, allowing leakage.
Do you have any kind of oil spew from the dipstick?
Onto the issue at hand: Do you have a clean PVC unit hooked up, and a clean valve cover breather?
Are your valve cover bolts just a little tighter than finger tight? I think 5 -7 inch lbs.
If they're too tight, they'll disform the valve cover and crush the gasket too much, allowing leakage.
Do you have any kind of oil spew from the dipstick?
The VC is tricky to seal... best case you just have an issue with fit or flatness of the valvecovers or gasket.
If there is a ring seal problem, it would usually also show up as excess oil consumption and maybe fast "blackening" of the oil. Is there any of that going on? Also low or uneven results on compression test.
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