Dual-mass flywheel question
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Junior User
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Dual-mass flywheel question
How can i know if my flywheel is going out? It's a '97 F250 5-speed. Someone suggested it but i just wanted to know how you guys can tell if one is going out. I know my symptoms but this isn't something i just want to throw a dart at a wall about!! Thanks for any help
Senior User
Joined: Dec 2006
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The symptoms my truck had that made me aware I needed to replace the DMFW were
1) When I would let the clutch out when the truck was sitting, it would make a "whack whack whack whack" sound at about half second intervals
2) when I shut the truck down, I would get a rattle from the area under the doghouse in the truck
I replaced mine with a LUK clutch and SMFW and those symptoms both went away.
The LUK clutch and SMFW were about 600 bucks and the installation was about 600 bucks (labor rates are pretty high in california where I live).
WR
1) When I would let the clutch out when the truck was sitting, it would make a "whack whack whack whack" sound at about half second intervals
2) when I shut the truck down, I would get a rattle from the area under the doghouse in the truck
I replaced mine with a LUK clutch and SMFW and those symptoms both went away.
The LUK clutch and SMFW were about 600 bucks and the installation was about 600 bucks (labor rates are pretty high in california where I live).
WR
Playing in the Dirt
Joined: Oct 2005
Posts: 2,302
Likes: 1
From: Southwest Georgia
As stated above, a vibration and noise from the bell housing area. A big "THUNK" when you turn the truck off. Hard pedal, clutch engagement about 1" off the floor, lurching at certain speeds while the engine rpms are constant. These are several of the symptoms of a DMF going south. You may not have all of these. It depends on how the DMF is going bad, center bearing seperation & offset, broken spring or springs, etc.
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Originally Posted by immastrokinnow
put it in fifth, let off the clutch like you were in first, if it stalls replace it. at least thats how they taught us in diesel skool
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Senior User
Joined: Mar 2007
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From: Lebanon MO
My clutch is doing something funky also but it doesnt make a clunk or anything its more of a hissing noise when i let out on the clutch in gear or out. any answers for me? also what would be the best clutch to replace it with i will need something more heavy duty than stock of course but dont want to go over board. thanks
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From: Herndon KY
Originally Posted by immastrokinnow
put it in fifth, let off the clutch like you were in first, if it stalls replace it. at least thats how they taught us in diesel skool
New User
Joined: Apr 2010
Posts: 9
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From: south mo.
Hello mklemin. New user Highboy-upgrade here. Have used the wisdom from this site for some repairs and it worked out for me. I also have the hissing sound with clutch engaged but have not figured it out yet. it is quite when pedal is to the floor. I have no slipping or no tob noise. Just wondering if you have got a solution yet. Your input would be greatly appreciated thanks Bryan
Hotshot
Joined: Oct 2003
Posts: 17,799
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From: Ashland City, TN
The DMF is a 40 piece bearing/clutch/spring setup.
You know. I really should count the parts before I keep saying 40 piece.
Anyways, there are 20+ pieces to it.
I wish I had my article finished for you to learn more, but this one will take a few days writing.
Anyways.
The DMF gets slop in it. The smack sound people are talking about is the clutch actually moving on the bearing inside and the clutches are wore out so its not keeping things tight anymore, as well as the springs being worn out.
Biggest tell tale signs are vibrations, odd noises and i'm sure there is a whole other list.
Get under the truck and take off the cover. have somebody push in the clutch. grab the part closest to the clutch, the part without the teeth on it, and see if you can turn it back and fourth.
Please block the tires!
FTE headline
"Member Dun Got Run Over, Talyn To Blame"
haha
If you can move the DMF, then its bad
I believe I have a picture in my DMF for Dummies thread showing how the flywheel turns.
You know. I really should count the parts before I keep saying 40 piece.
Anyways, there are 20+ pieces to it.
I wish I had my article finished for you to learn more, but this one will take a few days writing.
Anyways.
The DMF gets slop in it. The smack sound people are talking about is the clutch actually moving on the bearing inside and the clutches are wore out so its not keeping things tight anymore, as well as the springs being worn out.
Biggest tell tale signs are vibrations, odd noises and i'm sure there is a whole other list.
Get under the truck and take off the cover. have somebody push in the clutch. grab the part closest to the clutch, the part without the teeth on it, and see if you can turn it back and fourth.
Please block the tires!
FTE headline
"Member Dun Got Run Over, Talyn To Blame"
haha
If you can move the DMF, then its bad
I believe I have a picture in my DMF for Dummies thread showing how the flywheel turns.
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