Flywheel Swap
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Elder User
Joined: Oct 2002
Posts: 743
Likes: 1
Flywheel Swap
I have a dual mass flywheel in my 87 6.9 that is chattering. Can I replace it with a solid flywheel from an earlier 6.9 without changing anything else? If not, what else do I need?
Thanks
Thanks
Senior User
Joined: Jan 2005
Posts: 314
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I have read here that it is a swap. I think you will need the SM clutch, P-plate, and T-bearing. Think the fork is OK.
I'm sure the experts will chime in here to confirm.
I think I read somewhere that you can even retro-swap an old 6.9 SM flywheel into a 7.3 DM. Wondered if this is cheaper or as good as the LUK system? If so, why is it not done more often?
I'm sure the experts will chime in here to confirm.
I think I read somewhere that you can even retro-swap an old 6.9 SM flywheel into a 7.3 DM. Wondered if this is cheaper or as good as the LUK system? If so, why is it not done more often?
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
The Luk system is a 13" clutch that takes the torque much better.
I am running a 6.9 flywheel on my 7.3 turbo with no problems. But I do have to watch how hard I mash the loud pedal or it slips.
I am running a 6.9 flywheel on my 7.3 turbo with no problems. But I do have to watch how hard I mash the loud pedal or it slips.
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Elder User
Joined: Oct 2002
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As long as it's a direct swap, I'm happy. I can always upgrade the clutch , I just hate to shell out several hundred bucks on something that I can fix with factory parts for a lot less $$$.
I'm taking it that you can swap flywheels, do you have to replace the clutch with the earlier style too? What's the cutoff dates for the parts?
I'm taking it that you can swap flywheels, do you have to replace the clutch with the earlier style too? What's the cutoff dates for the parts?
Posting Guru
Joined: Oct 2003
Posts: 2,438
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From: Monroe, WA
You've got a dual mass in an 87? Is that a 5 spd? I didn't think they put those out till 88. Just curious.
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Elder User
Joined: Oct 2002
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Sure looks like it. When you look at the flywheel through a gap in the inspection cover, the flywheel looks strange. There are some levers and springs visible where there should just be a flywheel. I've never seen anything like it, so I was guessing that it was the dreaded dual mass.
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