ZF Transmission issue
Thread Starter
Team Owner
Joined: Aug 1999
Posts: 24,017
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St. Jude Donor '10
ZF Transmission issue
What does it mean when you get a whining sound when the tranny is in neutral but goes away when the clutch pedal is depressed? ive been told the noise is intermittent.
Is this the pilot bushing going out?
Is this the pilot bushing going out?
Team Owner
Joined: May 2002
Posts: 24,337
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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Usually it just means that you have a ZF transmission. I take it this isn't your car.
Does it only happen when the tranny is up to temp?
A bad throwout bearing on these will tend to make noise all the time since it's always rotating with the motor. The noise could get better or worse as you push the clutch in and load up the bearing, but I don't see how it'd ever be intermittent.
Does it only happen when the tranny is up to temp?
A bad throwout bearing on these will tend to make noise all the time since it's always rotating with the motor. The noise could get better or worse as you push the clutch in and load up the bearing, but I don't see how it'd ever be intermittent.
Instructor
Joined: Apr 2007
Posts: 136
Likes: 0
From: Fountain CO
My Z06 had a bad throw out bearing and it did it intermittently. Usually when it warmed up after 15 minutes on the road. Luckily it was covered by the warranty. I'm not trying to be disrespectful, just trying to help.
Le Mans Master
Joined: Dec 2002
Posts: 5,270
Likes: 3
From: Seattle Area WA
4+3 started doing this, I dropped the whole thing and put it back together two nights after work. I rushed...I only replaced the pilot bushing. Its still there, its the throwout bearing... 
If this noise wasn't there before and now it is, it is the throwout bearing.
If this noise wasn't there before and now it is, it is the throwout bearing.
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
ZF and 4+3 throwout bearing are quite different. ZF bearing is attached to pressure plate and always spins.
ZF rattles in neutral, that's just how it is.
ZF rattles in neutral, that's just how it is.
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Thread Starter
Team Owner
Joined: Aug 1999
Posts: 24,017
Likes: 634
St. Jude Donor '10
Yes its not my car.Does it only happen when the tranny is up to temp?
but I don't see how it'd ever be intermittent.
Im guessing by the replies its normal and nothing to worry about.
Last edited by SurfnSun; Apr 26, 2007 at 06:28 AM.
Melting Slicks
Joined: Apr 2007
Posts: 2,616
Likes: 111
That's right. The ZF is even worse if you have a single mass, alum. FW like I do; I have a new ZF, new clutch pressure plate, etc. and mine (with the clutch disengaged in neutral) rattles extremely loud at low RPM (idle); not to worry; did the same thing with the other ZF (black tag) I had
Race Director
Joined: Dec 2002
Posts: 13,348
Likes: 233
From: SCMR Rat Pack'r Charter Member..Great Bend KS
Doesn't sound like a throwout bearing.
Doesn't sound like a pilot bushing.
Does sound like a gearbox thing.
Whether it's normal or not depends on the noise.
(How ya' doin', Surfie...?
Your turbo project 'bout done yet?)
Larry
code5coupe
___________
I ain't easily impressed....
Doesn't sound like a pilot bushing.
Does sound like a gearbox thing.
Whether it's normal or not depends on the noise.
(How ya' doin', Surfie...?
Your turbo project 'bout done yet?)Larry
code5coupe
___________
I ain't easily impressed....
Le Mans Master
Joined: Jun 2006
Posts: 5,642
Likes: 5
From: One day you're a Comet...the next day you're dust... Arkansas
I guess I'm lucky, my ZF6 1989 black tag doesn't whir loudly or rattle hot or cold in nuetral with the clutch out. Things that make you go....... Hmmmm?
Thread Starter
Team Owner
Joined: Aug 1999
Posts: 24,017
Likes: 634
St. Jude Donor '10
Doesn't sound like a throwout bearing.
Doesn't sound like a pilot bushing.
Does sound like a gearbox thing.
Whether it's normal or not depends on the noise.
(How ya' doin', Surfie...? Your turbo project 'bout done yet?)
Larry
code5coupe
___________
I ain't easily impressed....
Doesn't sound like a pilot bushing.
Does sound like a gearbox thing.
Whether it's normal or not depends on the noise.
(How ya' doin', Surfie...?
Your turbo project 'bout done yet?)Larry
code5coupe
___________
I ain't easily impressed....
Race Director
Joined: Dec 2002
Posts: 13,348
Likes: 233
From: SCMR Rat Pack'r Charter Member..Great Bend KS
Maybe there's a cat caught in the clutch, and when the owner presses on the clutch pedal it chokes the cat?
Larry
code5coupe
__________
I ain't easily impressed....
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
True for most cars. But on the ZF clutch, the throwout bearing always spins. It is clipped to the pressure plate on one end, and clipped to the clutch fork on the other. Although it won't be loaded up.