What's the whistle ?

**gmhowe** · 10-25-12, 03:47 PM

Hi again, have 85 z51 with 4+3 Tranny and wondering what is the whistle I hear as I drive and gets louder the faster I go but put in the clutch and it goes away and goes away after warming up, seems to be coming from the passenger side. Sounds like a normal human whistlng.

Thanx
Gordon

**roger longman** · 10-25-12, 05:20 PM

Hi Gordon, sounds like the thrust bearing, to me but, I'm sure someone, with more knowledge, will have an answer......Roger.

**roger longman** · 10-28-12, 07:53 PM

Hi all, someone who knows more than me, please !........Roger.

**tmkassin** · 10-28-12, 08:36 PM

When it's whistling slightly push on the clutch until it just starts to make contact with the throwout bearing. If it stops whistling as it engages then the bearing is where the noise is coming from. It might be that it is out of adjustment and the bearing is not disengaging with the pedal all the way up.

**roger longman** · 10-30-12, 03:43 PM

Originally Posted by tmkassin

When it's whistling slightly push on the clutch until it just starts to make contact with the throwout bearing. If it stops whistling as it engages then the bearing is where the noise is coming from. It might be that it is out of adjustment and the bearing is not disengaging with the pedal all the way up.

That's what I call a thrust bearing......Roger.

**vigman** · 10-30-12, 11:12 PM

Well your almost correct... the function is similar
Thrust bearing - Wikipedia, the free encyclopedia

Throwout bearing aka Clutch release bearing

The "throw-out bearing" is the heart of clutch operation. When the clutch pedal is depressed, the throw-out bearing moves toward the flywheel, pushing in the pressure plate's release fingers and moving the pressure plate fingers or levers against pressure plate spring force. This action moves the pressure plate away from the clutch disc, thus interrupting power flow.
Clutch Release Mechanism Explained - Xtreme Import Performance
Clutch

**roger longman** · 10-31-12, 04:01 PM

Originally Posted by vigman

Well your almost correct... the function is similar
Thrust bearing - Wikipedia, the free encyclopedia

Throwout bearing aka Clutch release bearing

The "throw-out bearing" is the heart of clutch operation. When the clutch pedal is depressed, the throw-out bearing moves toward the flywheel, pushing in the pressure plate's release fingers and moving the pressure plate fingers or levers against pressure plate spring force. This action moves the pressure plate away from the clutch disc, thus interrupting power flow.
Clutch Release Mechanism Explained - Xtreme Import Performance
Clutch

Wikipedia states: 'One specific thrust bearing in an automobile is the clutch "throwout bearing"sometimes called the clutch release bearing'. I think that makes me correct, not almost correct........Roger.

**vigman** · 10-31-12, 07:35 PM

Sorry

Mike

**gmhowe** · 11-01-12, 09:51 AM

Ok so what would cause it, I don't drive this one as much as my 96 and the tranny only has about 3k miles on it since it was rebuilt. Could it just be lack of use ? Maybe I need to drive it more ?

G

**roger longman** · 11-01-12, 04:30 PM

Originally Posted by vigman

Sorry

Mike

Hi Mike, Hey, don't mention it. It's the old 'divided by a common language' thing and I cant help being a Brit.......Roger..

**roger longman** · 11-01-12, 04:36 PM

Originally Posted by gmhowe

Ok so what would cause it, I don't drive this one as much as my 96 and the tranny only has about 3k miles on it since it was rebuilt. Could it just be lack of use ? Maybe I need to drive it more ?

G

Normally it means a replacement is needed. I would take it back to the people who rebuilt the transmission because, surely they checked out the clutch before reinstalling!.....Roger.

**Low drag - High speed** · 11-02-12, 10:51 AM

But the Thrust Bearing is a small brass colored bushing pressed into the rear center of the crankshaft. It's purpose is the keep the spline shaft from wobbling and is very important despite its minor appearance.
If the whistle doesn't adjust out and you need a new Throwout Bearing, make sure the Thrust Bearing is also replaced. And be sure to put a dollop of axle grease in it's center.

**BigJimZ16** · 11-02-12, 03:18 PM

Originally Posted by Low drag - High speed

But the Thrust Bearing is a small brass colored bushing pressed into the rear center of the crankshaft. It's purpose is the keep the spline shaft from wobbling and is very important despite its minor appearance.
If the whistle doesn't adjust out and you need a new Throwout Bearing, make sure the Thrust Bearing is also replaced. And be sure to put a dollop of axle grease in it's center.

...and that is actually called the PILOT BEARING or BUSHING depending on installation...

**roger longman** · 11-02-12, 03:49 PM

Originally Posted by Low drag - High speed

But the Thrust Bearing is a small brass colored bushing pressed into the rear center of the crankshaft. It's purpose is the keep the spline shaft from wobbling and is very important despite its minor appearance.
If the whistle doesn't adjust out and you need a new Throwout Bearing, make sure the Thrust Bearing is also replaced. And be sure to put a dollop of axle grease in it's center.

Throwout bearing / clutch release bearing = thrust bearing....