Bad Valve????????????????????????
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Bad Valve????????????????????????
I have a 460 in a 1972 Ford Condor. The engine was rebuilt prior to me buying it. On the way back from a road trip I noticed a slit drop in performance and the exhaust sounded muffled. I pulled the plugs and all are normal but #4 was dry fouled. Also I put a vacume gage on it and I was getting a 3-5 inch needle ***. How do I tell if I have a bad valve???
Hotshot
Joined: Dec 2003
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From: iowa
squirt a little oil in the cylinder and rerun the comp test if it comes up it's rings if it stays about the same it's valves. But with it bieng dry and not oil fouled my money is on valves or atleast valve train (could still be bend pushrod or flat cam lobe) you can check those real easy pull that vavle cover and look at the pushrod spin it with you finger if it's bend it will wobble if it's missing even easier, and if the cam lobe is bad you just need to crank it over and watch the rocker if it doesn't move the lobe is gone.
Last edited by monsterbaby; Aug 22, 2006 at 04:06 PM.
Post Fiend
Joined: Mar 2004
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From: Union, Washington
I would think if it isn't clacking away when running that driving it won't make it worse. You're gonna have to pull the head to really tell what is going on anyway.
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Ok, Valve update, I did a wet pressure check on the cylender in question and
to my delight it is not the rings. Also the cam and rod seem to be in working order. As I may have mentioned the engine was rebuilt 5 years ago and is clean with low miles. One thing I did notice even prior to adding oil to the cylender is that 1 out of 8 tries I would get a reading of 140lbs. Is the valve getting hung up on something? Anything I could do without pulling the head to lossen or knock it back into working order?
to my delight it is not the rings. Also the cam and rod seem to be in working order. As I may have mentioned the engine was rebuilt 5 years ago and is clean with low miles. One thing I did notice even prior to adding oil to the cylender is that 1 out of 8 tries I would get a reading of 140lbs. Is the valve getting hung up on something? Anything I could do without pulling the head to lossen or knock it back into working order?
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Post Fiend
Joined: Mar 2004
Posts: 6,056
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From: Union, Washington
You can always put some SeaFoam in your crankcase. I have used an old mechanics (even older than me and I'm OLD!!!!) trick a few times (probably more like a 100 or so times) that has worked pretty good, but if you get stupid while doing it you can wipe your bearings.
Post Fiend
Joined: Mar 2004
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From: Union, Washington
I wasn't saying you were stupid. But everyone does stupid things once in awhile and if you don't do the old proceedure just right, the bearings are gone. Carb cleaner in the oil is a bad thing, so after you spray it, you will need to change the oil. Go with a really good detergent oil too. It will clean this kind of stuff out of your motor. Some SeaFoam in the gas never hurt anything either.
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