C4 Offset Clutch Throwout Bearing? Help!
Thread Starter
Cruising
Joined: Dec 2012
Posts: 12
Likes: 0
From: Clarksville, MD
C4 Offset Clutch Throwout Bearing? Help!
Hey there... I'm new to the forum. I'm in the process of installing a SBC into an old Porsche 928 using a C4 clutch set-up. Just a quick question for you C4 guys - have you ever seen an offset throw out bearing? I have ordered two of them and they both look the same way. These bearings look like they going to wear against the pressure plate fingers. I can't figure out if they are both defective or if there is some mechanical reason for them to be offset. Both bearings are for C4 corvette. Picture attached with measurements for reference. Theories and opinions welcomed. Thanks, Bill
Melting Slicks
Joined: Jan 2009
Posts: 3,482
Likes: 196
From: folsom california
love thinking out side the box.
"Both bearings are for the C4 Corvettes"
don't know if this is of help, but as to the pull type clutches used 92 to through 96, the earlier "black tag" ZF trans/ clutch combo's used a throw out bearing with a larger I.D. than the late "blue tag" combo's did; mixups here are common.
"Both bearings are for the C4 Corvettes"
don't know if this is of help, but as to the pull type clutches used 92 to through 96, the earlier "black tag" ZF trans/ clutch combo's used a throw out bearing with a larger I.D. than the late "blue tag" combo's did; mixups here are common.
Race Director
Joined: Sep 2001
Posts: 14,674
Likes: 751
From: NEwhere Ohio
Also be aware that oem quality throwout bearings are near impossible to find.
The newer throwout bearings are made in china and are sloppy with lots of off axis play in them.
Its very frustrating
The newer throwout bearings are made in china and are sloppy with lots of off axis play in them.
Its very frustrating
Thread Starter
Cruising
Joined: Dec 2012
Posts: 12
Likes: 0
From: Clarksville, MD
love thinking out side the box.
"Both bearings are for the C4 Corvettes"
don't know if this is of help, but as to the pull type clutches used 92 to through 96, the earlier "black tag" ZF trans/ clutch combo's used a throw out bearing with a larger I.D. than the late "blue tag" combo's did; mixups here are common.
"Both bearings are for the C4 Corvettes"
don't know if this is of help, but as to the pull type clutches used 92 to through 96, the earlier "black tag" ZF trans/ clutch combo's used a throw out bearing with a larger I.D. than the late "blue tag" combo's did; mixups here are common.
Race Director
Joined: Sep 2001
Posts: 14,674
Likes: 751
From: NEwhere Ohio
btw:
the TO bearing you post in that above picture looks nothing like the TO bearing in the corvette
heres a throwout bearing for a ZF black tag (89 thru half of 93)
Even the chinese ones 'mimic' the overall shape/construction of this one. They just arent as tight (sloppy with more off-axis play between the parts)
the TO bearing you post in that above picture looks nothing like the TO bearing in the corvette
heres a throwout bearing for a ZF black tag (89 thru half of 93)
Even the chinese ones 'mimic' the overall shape/construction of this one. They just arent as tight (sloppy with more off-axis play between the parts)
Team Owner
Joined: Sep 2003
Posts: 25,389
Likes: 2,741
btw:
the TO bearing you post in that above picture looks nothing like the TO bearing in the corvette
heres a throwout bearing for a ZF black tag (89 thru half of 93)
Even the chinese ones 'mimic' the overall shape/construction of this one. They just arent as tight (sloppy with more off-axis play between the parts)
the TO bearing you post in that above picture looks nothing like the TO bearing in the corvette
heres a throwout bearing for a ZF black tag (89 thru half of 93)
Even the chinese ones 'mimic' the overall shape/construction of this one. They just arent as tight (sloppy with more off-axis play between the parts)
