Is this a dual mass problem? - Ford Powerstroke Diesel Forum
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Old 10-05-2009, 08:53 AM
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Is this a dual mass problem?

I'm still new to the whole diesel thing but I have learned a lot of stuff from this site and the links on this site. I have spent a lot of time trying to learn everything I can about the 7.3 Powerstroke.
I think I may have a problem with the dual mass flywheel.
I hope some of you can help me. From what I have read it seems to be the DM

My concern is I only get the shaking after the engine is warmed up. It usually takes about fifteen minutes of driving before I notice anything.

Does that sound right? Should it not do it upon start up?

I took off the plate on the bell housing and inspected the flywheel and I could not budge it at all. I could rotate the other disk toward the trans about one inch. I,m not sure what its called.

I have had the truck for three weeks and have changed the oil and fuel filter. The fuel filter was very dark.

Thanks in advance.
Matt.
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Old 10-05-2009, 09:12 AM
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Does it continue to turn over after shutdown? If so, that's the flywheel. When replaced, you'll notice a pretty significant change in seat-of-the-pants feel.
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Old 10-05-2009, 09:22 AM
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There is a clanking sound upon shutdown.
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Old 10-05-2009, 07:29 PM
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Please, is it normal to be able to move any of the parts by hand under the trans plate? I'm about to spend $1,300 on the repair tomarrow. The mechanic says he is pretty sure that the problem is in the clutch area.

I just don't want to make a $1,300 mistake.

Thanks,
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Old 10-05-2009, 08:04 PM
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Your flywheel is trashed. Mine went at 130,000 miles. The friction plate was fine, but there was almost a quarter turn of play in the flywheel. Knew it was the flywheel because the truck would kick out of cruise control going uphill. And no, you can't use a dual mass friction plate on a single mass flywheel. When I replaced mine, I upsized to a 13" clutch. Also, check your hydraulics and also the clutch pedal bushing.
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Old 10-05-2009, 08:25 PM
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Thanks Bronco. How does the $1,300 price sound? It will be a Luk upgrade kit for a manual trans.
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Old 10-05-2009, 08:59 PM
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Sounds OK to me for a new clutch and flywheel installed. Don't forget the master slave. Nine times out of ten they get hosed up in the clutch replacement and you'll have to replace it at an inopportune moment. Best to do it at the same time. Money well spent.
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Old 10-06-2009, 12:40 AM
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Sounds a little steep, but I'm also from a small town where I knew both the parts guy and the mechanic, so they cut me a deal and I did it all for about $800.
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Old 10-06-2009, 02:06 AM
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its about 500bucks or so for a single mass conversion from LUK. Then labour todo so.
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Old 10-06-2009, 01:57 PM
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Thanks for all of the replies. It's in the shop right now. I got a call saying that the rear main seal is leaking a little. They said they can put one in for $77, so I told them to go ahead. Better now while it's apart.
I'm looking forward to NOT having that (drive me crazy) rattle.

I told the mechanic that I wanted to keep the parts that are being replaced so I can take pictures and to educate myself as to the failing part. I only wish I would have recorded some audio of the problem as it was happening. I will never forget that sound. It was embarresing to come to a stop with other drivers around. I coundn't even go through the drive-through for a bite to eat.

I'll keep you informed of the change.
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