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How can i get my motor to stop over heating? why am i having blowback out my valve covers. do i need a egr valve
i have 1980 ford 302 with a 4 barrel intake and carb. i hav replaced the water pump with a reverse pump cause it has a serpiteen belt. i pulled the thermostate and by passed the heatercore still over heating. the motor is gaining so much back pressure it has blew the rear main seal. if you start driving it will blow the pcv valve out. when you pull the oil fil cap or the dip stickyou can watch a whitish blue smoke blow out.

Asked by: alspaughsean

User type: Enthusiast

Asked on: April 21, 2009 22:59

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den1320
User type: Enthusiast
Posted: 10 months ago
Well sounds like your camshaft is worn out and it is not opening the valves. This will cause the presure in the engine to be very high I would replace the cam and lifters. I would also replace the valve guides in the heads. Also run a 180 degree thermostat. this should fix your engine heating problems.I hope this helps you out.
Amv12front
TheRipper
User type: Enthusiast
Posted: 10 months ago
Sounds like a bunch of things, bad rings, bad valves, bad head gaskets. A motor should not have that much blow by and usually when it does it is time to start pulling it apart. You can do a few things like check compression, and related blown head gasket tests, but a worn out cam is likely the least probable cause of overheating, blue smoke, sound much worse then that sorry to say. BTW this is all speculation you really need to spend some time and start with simple diagnostics like compression, leak down if you have the gear, radiator pressure check can show head gasket and other leaks if not holding pressure, check oil for white-ness (water in oil), etc. Pull the valve cover and see if things are working as they should. Pulling the thermostat is NOT a good idea you need a restriction in the cooling systems where the T-Stat is, and a 180degree should be used in any case, but it sounds like other bad things are going on.
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joeljenkins
User type: Enthusiast
Posted: 2 months ago
It sounds like you have some severe issues with blow-by and/or head gasket seal:
an easy way to check for possible blown head gaskets is to remove the rad cap with
the engine running. You could get anything from bubbling coolant to actual expulsion of the coolant out of the rad neck under pressure (even without excessive engine temps). And of course, a compression check/leakdown check would also be in order.
As already mentioned , not running a thermostat is a bad idea, but your other issues
need to be addressed immediately 'cause without correcting them, presence or lack
of a thermostat is a moot point.

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