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06-30-2010, 04:30 PM | #1 |
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Frozen Intake Valves
I local buddy picked up a "Barn Fresh" Model A recently. the intake valves are SERIOUSLY stuck! He managed to get one to move enough to remove with considerable force and several hours work. He had soaked them with Kroil assuming it was a rust problem. What he found was what appears to be carbon buildup in the valve and guides.
I've never heard of anything quite like this. The rest of the engine looks quite good with the head off. Any ideas on something that may get in there and soften the carbon enough to make a difference? He did what seemed to be the easiest valve! I have a couple thoughts but don't yet want to influence the feedback. Thanks...
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06-30-2010, 04:49 PM | #2 |
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Re: Frozen Intake Valves
I heard of someone soaking with oven cleaner.
No first hand experience with it, so cannot recommend.
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06-30-2010, 04:52 PM | #3 |
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Re: Frozen Intake Valves
Water softens carbon
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06-30-2010, 04:58 PM | #4 |
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Re: Frozen Intake Valves
just athought from a couch idea, could you go in with a portable glass or baking soda ,low pressure , and blast a little carbon away?..but then, it would not clean the stuck area?..oh well..this make this site interesting..we get to think..thank you..charles..)..
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06-30-2010, 05:05 PM | #5 |
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Re: Frozen Intake Valves
There are several old recipes involving nasty chemicals that are generally unobtainable except to chemists but the gun shops sell barrel cleaners to remove powder residues that are baked carbon to a large extent.
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06-30-2010, 07:05 PM | #6 |
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Re: Frozen Intake Valves
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06-30-2010, 07:36 PM | #7 |
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Re: Frozen Intake Valves
I would be supprised if spray Carburator Cleaner would not work. Some of the penetrating oils will desolve rust and corrosion but they may not do anything to carbon.
Just a thought. Chris |
06-30-2010, 07:44 PM | #8 |
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Re: Frozen Intake Valves
Flood the valve stems with carbon disulfide. If you can't get them up enough to squirt it under the valve heads, remove the intake manifold to get at the stems. Stuff a rag soaked with it in the port against the stems and let it soak several hours. Diethyl Ether with top cyl lube (Diesel starting fluid in a spray can) works too, but it evaporates a bit too fast, requiring multiple applications, and it will knock you out in a garage.
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06-30-2010, 07:56 PM | #9 |
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Re: Frozen Intake Valves
Just to play the devil's advocate here, how could this be? To build up carbon enough to stick the valves to that extent the engine would have to run. If the valves stick the engine won't run hence no carbon. This means before the valves could seize the engine would stop running. I am of the opinion that you have a serious rust problem but carbon will make the job harder.
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06-30-2010, 10:40 PM | #10 |
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Re: Frozen Intake Valves
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06-30-2010, 10:53 PM | #11 | |
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Re: Frozen Intake Valves
Quote:
I think oil softens carbon, but Kroil or Sea-Foam may work quicker. I would always pick out chunks of carbon with an old screwdriver to get the bulk of it out. If you look at an oil burning engine with worn rings you will see that the oil getting past the rings has cleaned the carbon off the outside edge of the pistons. |
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06-30-2010, 11:45 PM | #12 |
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Re: Frozen Intake Valves
Could you use a propane torch and burn the carbon off?
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