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09-06-2020, 07:57 PM | #1 |
Junior Member
Join Date: Sep 2020
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1949 8BA no compression
I am having issues with #2 cylinder. It's not registering any compression. The gentleman who sold me the truck is saying it is a stuck valve.
Any helpful input would be great. Sent from my SM-N960U1 using Tapatalk |
09-06-2020, 08:12 PM | #2 |
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Join Date: May 2010
Location: Coral Springs FL
Posts: 10,879
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Re: 1949 8BA no compression
Can you remove the spark plug and squirt some liquid wrench or Marvel Mystery oil in the cylinder and let it soak for a few days?
I guess next step would be to pull the head. |
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09-06-2020, 08:13 PM | #3 |
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Location: Wichita KS
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Re: 1949 8BA no compression
Zero compression could sure be a stuck valve. Bad rings would more likely be a low reading. If the valve is sticking open there is not going to be any compression at all. Will the engine run at all? With out taking it apart about all you can do is try soaking the valve stem in something to free it up. If that gets you nowhere, then remove the intake manifold and see if you can free it up.
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09-06-2020, 09:09 PM | #4 |
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Join Date: May 2010
Location: Oshkosh, Wi
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Re: 1949 8BA no compression
If the exhaust valve is stuck,you can remove the spark plug and check if it is moving as it is right below the plug. You should be able to see the intake valve off to the side.
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09-07-2020, 03:44 AM | #5 |
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Location: Christchurch New Zealand
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Re: 1949 8BA no compression
Along with above suggestions to perhaps check valve clearances at this cylinder.
Adjuster may have moved. Try the easy bits first. Phil NZ |
09-07-2020, 08:32 AM | #6 |
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Re: 1949 8BA no compression
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09-07-2020, 09:27 AM | #7 |
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Re: 1949 8BA no compression
if it runs, dribble a little brake fluid into the carb, then dribble MMO or ATF this will "fog" the valve guide and loosen stuck valves--sometimes you can free up a stuck exhaust valve by gently tapping on it thru the spark plug hole
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09-07-2020, 05:18 PM | #8 |
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Join Date: Sep 2020
Posts: 4
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Re: 1949 8BA no compression
So I soaked it in MMO. No luck. #2 cyl makes it difficult to see the other valve. The valve beneath the spark plug is moving. I was told thats an exhaust valve but it looks like an intake. Not sure.
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09-07-2020, 06:07 PM | #9 |
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Location: Wichita KS
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Re: 1949 8BA no compression
Blow some air in there at tdc on compression and see where the air comes out.
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09-07-2020, 06:16 PM | #10 |
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Re: 1949 8BA no compression
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09-07-2020, 06:23 PM | #11 |
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Join Date: Sep 2020
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Re: 1949 8BA no compression
Heres a pic
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09-07-2020, 07:08 PM | #12 |
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Re: 1949 8BA no compression
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