XJS ( X27 ) 1975 - 1996 3.6 4.0 5.3 6.0

V-12 Clutch to Flywheel Bolt part numbers

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Old May 2, 2025 | 08:23 AM
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Cool V-12 Clutch to Flywheel Bolt part numbers

Manual transmission Conversion. Have a new V-12 Flywheel from The Driven Man. I need bolt part numbers for the clutch pressure plate to flywheel. Unusual tapped holes in flywheel. The first 1/4"is 3/8”-24 UNF the remainder of depth of the hole is threaded 5/16”-24. Could this be a mistake? I read on line somewhere that the bolts are sold as six sets of two, but not part numbers listed. Any help appreciated. Speedster in Michigan
 
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Old May 2, 2025 | 08:26 PM
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Originally Posted by Speedster
Manual transmission Conversion. Have a new V-12 Flywheel from The Driven Man. I need bolt part numbers for the clutch pressure plate to flywheel. Unusual tapped holes in flywheel. The first 1/4"is 3/8”-24 UNF the remainder of depth of the hole is threaded 5/16”-24. Could this be a mistake? I read on line somewhere that the bolts are sold as six sets of two, but not part numbers listed. Any help appreciated. Speedster in Michigan
i have the Drivenman aluminum flywheel on my tkx swapped xjs.

i used these. Also, you need longer flywheel to crank bolts(i got mine from moss). Also, you dont need the dowels, leave those out.


 

Last edited by nickr76; May 2, 2025 at 08:27 PM.
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Old May 3, 2025 | 03:45 PM
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Default Flywheel to Crankshaft Bolts

Thank you Nick76. Info is priceless. Forums are worth there weight in gold! The longer Flywheel bolts is the second bit of very good information. Went on Moss catalog on line and could not find the longer bolts. Do you happen to have any information on these 10 bolts? Part number from Moss or just the length?
 

Last edited by Speedster; May 4, 2025 at 08:10 AM. Reason: Additional Information needed
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Old May 4, 2025 | 10:21 AM
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Part #C4855

you dont need the dowels from the flex plate either, the Drivenman(Holley) flywheel is a friction fit on the end of the crank, it will align itself.

put it in the oven to heat it up and it will slide right on, then bolt it up. Once it cools it will be on there tight so make sure you get the bolts on before it cools.

also, very important, the pressure plate to flywheel bolt torque is quite low, the aluminum flywheel wont take much to strip.

If you need any more advice, let me know. I changed/improved a few things when i did my swap.



 

Last edited by nickr76; May 4, 2025 at 10:23 AM.
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Old May 4, 2025 | 11:58 AM
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Nickr I'm usually pretty good at finding these items but not this one. Was afraid of ordering the wrong ones and have another part in the spare draw! The reminder of the torque in aluminum is appreciated. Overlooked that item. The fold over tabs help.
Thanks again
Al Ruckey
Michigan
 
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Old May 4, 2025 | 01:32 PM
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The torque of the flywheel to crank bolts should be factory spec. Its the pressure plate to flywheel you need to be careful with.

how far along on the conversion are you?
 
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