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EFV-8 Club Forum / General Ford Discussion / 36 flathead engine vibration

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Discussion Topic: 36 flathead engine vibration -- page: 1 2

40 Coupe

05-07-2025 @ 4:32 AM

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Posts: 1803
Joined: Oct 2009

Have the flywheel and pressure plate balanced together.

fordv8j

05-05-2025 @ 3:29 PM

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Posts: 194
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Probably should have the flywheel resurfaced

40 Coupe

05-04-2025 @ 4:58 AM

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Change the flywheel, Good question! The bolt pattern does change but I am not sure of what size pressure plate matches the 11" bolt pattern. Some people have had the flywheel redrilled.

fordv8j

05-03-2025 @ 2:50 PM

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To rule out water pumps, remove belt, start it up....easy check

number9

05-03-2025 @ 12:59 PM

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thanks, I will try it

37RAGTOPMAN

05-03-2025 @ 5:58 AM

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Posts: 1992
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vibration
if you think it is the water pumps,
simple fix,
loosen the fan belt and remove,
then run the motor, and see if the vibration is gone,
this vibration, all of a sudden start,
hope this helps 37 Ragtopman.Maine

number9

05-03-2025 @ 5:56 AM

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I guess I should ask if I will need to replace the flywheel also?

number9

05-03-2025 @ 5:43 AM

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I think you are probably right , I will take your advise and put a smaller clutch and pressure plate to see what happens. I have had the engine in and out of the truck enough times , so one more will not be a big deal. Thanks for the advise.

40 Coupe

05-03-2025 @ 5:28 AM

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Most of the Ford type pressure plates (Long style) have weights on the outside which move with engine RPM, this causes increased downward force on the PP to eliminate any clutch slippage. Adding an 11" clutch and pressure plate which your transmission was not designed for may be your problem. The weights on the pressure plate may be hitting the inside of the transmission bell housing as engine RPM increases. This is a very common problem when switching to a much larger PP and clutch. Has the problem always been there after install of the engine? Do check out other possible causes before doing major work to remove the PP

number9

05-02-2025 @ 3:12 PM

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I think I am my own gremlin in this problem. I was thinking the engine came out of a 36 coupe with a 9 inch clutch. I had an 11 inch clutch and pressure plate, and flywheel form another newer engine and I put it on when I installed the engine forgetting to have it checked for balance. I am beginning to think the problem is my poor judgement in to checking the balance on those parts. I would still like your thoughts on this before I pull the engine and check these parts.

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