Dual Mass Flywheel
Thread Starter
Racer
Joined: Sep 2005
Posts: 385
Likes: 8
From: north branford ct
Dual Mass Flywheel
I have a 1990 with the stock 245hp engine and a six speed. With my car up on jack stands and running in neutral --no noise--When I put it in any gear and let out the clutch It starts clanging and banging. I have the tranny and clutch and pressure plate out the clutch looks fine(I was hopeing it was that) today I am taking off the flywheel. Is this a dual mass flywheel? What is a dmf ? I had a 69 camaro with normal 4 speed stuff this car is a different story. Can a dmf cause that clanging or do you think it is the tranny?
Thanks for your help--Walter
Thanks for your help--Walter
Melting Slicks
Joined: Dec 2004
Posts: 3,219
Likes: 1
From: Somerset Co, NJ
Actually, the dual mass flywheel was intended to alleviate noise, especially in Nueutral, which is not your problem. It consists of a primary wheel, and a secondary flywheel. The secondary wheel is mounted on the primary and it rides on ball bearings, and has dampening springs which quiets any gear rattle between the mainshaft and countershaft gears.
Sounds like the problem might be in the gearbox. Good Luck!
BTW Yes, 1990 has a dmf, ZF 6 speed trans.
Sounds like the problem might be in the gearbox. Good Luck!
BTW Yes, 1990 has a dmf, ZF 6 speed trans.
Last edited by C4Jimmy; Sep 18, 2005 at 09:37 AM.
Pro
Joined: Feb 2005
Posts: 658
Likes: 1
From: Centerville OH
Originally Posted by mudslide
I just got it off and I can turn the clutch surface back and forth about an inch --like its mounted in rubber--is this normal 
Pro
Joined: Feb 2005
Posts: 658
Likes: 1
From: Centerville OH
I looked in my service manual before I replied to the message. It doesn't list a test procedure. From what I remember when I tested mine 12 years ago, you apply x amount of torque and measure the displacement between the inner and outer rings. I don't remember now what the torque spec was but I do remember thinking at the time that it was pretty low.
I responded that the movement was normal based on what I remember of the test procedure. It didn't occur to me that the inch movement mudslide referred to might be by hand. If he was moving it by hand, then I agree with Bogus.
At any rate, though, I doubt the DM is the source of the noise since it doesn't rattle in neutral.
I responded that the movement was normal based on what I remember of the test procedure. It didn't occur to me that the inch movement mudslide referred to might be by hand. If he was moving it by hand, then I agree with Bogus.
At any rate, though, I doubt the DM is the source of the noise since it doesn't rattle in neutral.
Thread Starter
Racer
Joined: Sep 2005
Posts: 385
Likes: 8
From: north branford ct
dmf
Yes I can move it by hand and allthough its hard I can move it till it clicks and stops --must be the end of the spring travel--I was wondering if that could get rocking back and forth at an idle cause a noise --the noise was not there when the car was under power . 
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Intermediate
Joined: Mar 2005
Posts: 33
Likes: 0
The sevice manual includes a method to determine if you have too much movement between the dual mass plates. I was having noises when the transmission was in nuetral and the car had warmed up, so I decided to go with a solid flywheel when I replace the clutch.
Racer
Joined: Apr 2001
Posts: 309
Likes: 5
From: La Crosse,WI,USA
How do you know when the Flywheel needs to be replaced? My '93 has 90K and a noisy clutch so I am replacing it. Many guys are getting 120-135K from their flywheels and I plan on driving 2-3K a summer why should I replace the flywheel? How do I know its on its last legs? I have NO VIBRATION just a noisy throwout bearing and no slippage?
-Thanks,
Charlie
-Thanks,
Charlie