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post #1 of (permalink) Old 06-09-2003, 11:23 AM
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Engine question

I have a 78 Ford Bronco with a 351M motor. I am getting alot of air and smoke blowing out of the passenger side valve cover where the tube goes into it that hooks to the breather. You would probably never notice it if you didn't unhook the hose from the breather. It doesn't smoke out of the exhaust. I am told that this means that my rings are bad and I am getting alot of blow by. Any suggestions?
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post #2 of (permalink) Old 06-09-2003, 02:50 PM
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Re: Engine question

I would think that this could be verified through a quick compression test. Any auto store sells a hand compression test you screw into the spark plug hole so you can crank it and check what presssure each cylinder is holding. I am wondering if you are having valve troubles.
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post #3 of (permalink) Old 06-09-2003, 08:35 PM
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Re: Engine question

A leakdown tester would be a more accurate way of determining if its blow-by. Its basically two pressure guages that you attach to a compressed air source on one end and screw into the plug holes like a compression testor to determine at what rate pressure is leaking past your rings, its a little more accurate than a compression tester as you can listen for air hissing (with the engine off )through the intake (bad intake valve seating) or the exhaust side also. Not sure if any parts stores rent them though.
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