Throwout Bearing question for the experts - ZR-1 Net Registry Forums

Ccmano · 12-08-2017

Ran across this while doing my clutch recently. Take a look at the attached video I took and tell me which bearing movement is correct or doesn’t it matter. The first one is an original AC Delco I removed from my car. The two other new AC/Delco’s I have functioned identically, one of which I installed in the car. The second one is an aftermarket bearing produced in Brazil.

https://youtu.be/EJMrBs2gbe0

Your input is appreciated.
H

Ccmano · 12-09-2017

So just to clarify, on the AC/Delco units the bearing is held loosely in its framework. (for lack of a better word). This allows the entire bearing, outer race and all, the spin in the frame. All three of the Delco units I have are like this. On the aftermarket bearing the outer race is held tightly in the framework and the bearing only spins as a bearing should within itself. It almost seems like the aftermarket bearing is correct and the Delco is wrong. Is there a reason for this? Doesn’t it even matter?
H

Jagdpanzer · 12-09-2017

Noticed the same thing with the Delcos thrust bearings fitting a little loose. However, I’ve not observed any unusual noise or behavior during operation.

Dynomite · 12-09-2017

Quote:

Originally Posted by Ccmano

So just to clarify, on the AC/Delco units the bearing is held loosely in its framework. (for lack of a better word). This allows the entire bearing, outer race and all, the spin in the frame. All three of the Delco units I have are like this. On the aftermarket bearing the outer race is held tightly in the framework and the bearing only spins as a bearing should within itself. It almost seems like the aftermarket bearing is correct and the Delco is wrong. Is there a reason for this? Doesn’t it even matter?
H

I think both (inside and outside) Throwout bearings spin if you hold one the other is free no matter which one you hold. At least that is the way it is on three that I just checked. When you engage the clutch placing pressure on the Throwout bearing the inside bearing is working/spinning. When you release the clutch, the outside bearing is always spinning.

Ccmano · 12-09-2017

Quote:

Originally Posted by Dynomite

I think both (inside and outside) Throwout bearings spin if you hold one the other is free no matter which one you hold. At least that is the way it is on two that I just checked.

What brand are yours, Cliff? The aftermarket bearing I have does not spin in the frame at all.
H

Dynomite · 12-09-2017

Quote:

Originally Posted by Ccmano

What brand are yours, Cliff? The aftermarket bearing I have does not spin in the frame at all.
H

The standard one

A. When you engage the clutch placing pressure (pulling with the Clutch Fork) on the Throwout bearing the inner bearing is working/spinning.
B. When you release the clutch, the outer bearing is always spinning.
C. The inside collar is prevented from spinning by the Clutch Fork. The Outside collar is always spinning with the Pressure Plate.
D. The Clutch Disk is spinning or not depending on if it is compressed between the Pressure Plate and the Flywheel.

Throwout Bearings and Clutch Forks

12-08-2017	#1
Ccmano Join Date: Jun 2006 Location: Sparks, NV Posts: 2,852	Throwout Bearing question for the experts Ran across this while doing my clutch recently. Take a look at the attached video I took and tell me which bearing movement is correct or doesn’t it matter. The first one is an original AC Delco I removed from my car. The two other new AC/Delco’s I have functioned identically, one of which I installed in the car. The second one is an aftermarket bearing produced in Brazil. https://youtu.be/EJMrBs2gbe0 Your input is appreciated. H __________________ 90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold.

12-09-2017	#2
Ccmano Join Date: Jun 2006 Location: Sparks, NV Posts: 2,852	Re: Throwout Bearing question for the experts So just to clarify, on the AC/Delco units the bearing is held loosely in its framework. (for lack of a better word). This allows the entire bearing, outer race and all, the spin in the frame. All three of the Delco units I have are like this. On the aftermarket bearing the outer race is held tightly in the framework and the bearing only spins as a bearing should within itself. It almost seems like the aftermarket bearing is correct and the Delco is wrong. Is there a reason for this? Doesn’t it even matter? H __________________ 90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold. Last edited by Ccmano; 12-09-2017 at 10:46 AM.

12-09-2017	#3
Jagdpanzer Join Date: Apr 2007 Location: Northern VA Posts: 2,650	Re: Throwout Bearing question for the experts Noticed the same thing with the Delcos thrust bearings fitting a little loose. However, I’ve not observed any unusual noise or behavior during operation. __________________ Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake