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05-18-2023, 03:29 PM | #1 |
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34 Flathead only turns about 45 degrees then catches
I have a 34 Ford Phaeton that I am working to restore. When I turn the crank, it will only turn about 45 degrees then stops with what sounds like a thud in the front left of the engine. The wiring is completely out of the car now, so no use of the starter. Heads are off as I am cleaning all the accumulated gunk out. Cylinders and pistons look good and move freely for the little bit that the engine will turn. Any ideas what might be holding it back?
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05-18-2023, 03:32 PM | #2 |
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Location: Mn
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Re: 34 Flathead only turns about 45 degrees then catches
Could be a stuck valve. Use a real good penetrating spray and
spray the valve stems, guides and lifters real good. .
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05-18-2023, 03:33 PM | #3 |
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Re: 34 Flathead only turns about 45 degrees then catches
connecting rod--what type engine is it-original? 59ab?8ba?
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05-18-2023, 07:00 PM | #4 |
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Re: 34 Flathead only turns about 45 degrees then catches
I would lift the intake and have a look but wouldn't be surprised if its a stuck valve . Nothing beats having a look intakes aren't major surgery and its good to check valve clearance anyway .As for using the starter on a stuck engine NEVER; if it wont turn by hand there's something wrong and that starter just might be the pin in the hand grenade
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05-18-2023, 09:55 PM | #5 |
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Re: 34 Flathead only turns about 45 degrees then catches
did not read all and my comments were useless. sorry
Last edited by David J; 05-19-2023 at 02:53 AM. |
05-19-2023, 07:09 AM | #6 |
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Re: 34 Flathead only turns about 45 degrees then catches
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05-19-2023, 07:14 AM | #7 |
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Re: 34 Flathead only turns about 45 degrees then catches
oops
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05-19-2023, 08:10 AM | #8 |
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Re: 34 Flathead only turns about 45 degrees then catches
I vote for a stuck valve. See if engine will turn backwards and stops indicating a valve stuck partially open.
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05-19-2023, 08:19 AM | #9 |
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Join Date: May 2023
Posts: 8
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Re: 34 Flathead only turns about 45 degrees then catches
Could be a bent rod hitting the bottom of the piston. I just rebuilt a 366 Chevy with that issue.
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05-19-2023, 08:30 AM | #10 |
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Re: 34 Flathead only turns about 45 degrees then catches
"If you hear hoofbeats, think horses, not zebras."
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05-19-2023, 10:37 AM | #11 | |
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Re: 34 Flathead only turns about 45 degrees then catches
Quote:
It could have a stuck but if it sat for a long time and a gasket leaked coolant into the cylinder and then somebody tried to crank it, it could have bent a rod. Before you crank an unknown engine rotate it two turns by hand first before you try the starter. Rotate the crank in the opposite direction. It rotates twice for every time the camshaft rotates once. Since you have the heads off you should be able to see all the valves move except for a stuck one. Like others said, you might as well pull the intake since it's an easy job. |
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05-19-2023, 02:42 PM | #12 |
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Join Date: Nov 2022
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Re: 34 Flathead only turns about 45 degrees then catches
Thanks everyone
Stuck Valve(s) was the issue... Marvel mystery Oil and a tiny shot of PB Blaster in each valve was the solution. (along with a little patience) |
05-19-2023, 06:12 PM | #13 |
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Join Date: May 2010
Location: Solihull, England.
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Re: 34 Flathead only turns about 45 degrees then catches
Thanks for feeding back. Often we are left wondering. Glad you got it freed up.
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05-21-2023, 09:28 AM | #14 |
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Location: Central Ohio
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Re: 34 Flathead only turns about 45 degrees then catches
Good news! Much appreciate you coming back on the Barn - it helps when folks see that "solutions" worked. Best of luck!
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05-21-2023, 09:28 AM | #15 |
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Location: Central Ohio
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Re: 34 Flathead only turns about 45 degrees then catches
BTW, post some pics of your project - we're always interested in looking at what others are working on.
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