Clutch & Throw out bearing issue - The 1947 - Present Chevrolet & GMC Truck Message Board Network

DangerDan · 08-01-2017, 09:40 AM

1971 C 10 came with 250 (6) cyl and Three speed
Changed to 327 High dome clutch and Muncie (4) speed
Issue is the long throw out bearing is too long and the Throw out bearing supplied with the clutch does not reach the fingers on the high dome clutch whne I depress the clutch pedal!
We have a very good clutch and drive line house here in Fort Wayne (Where i bought the clutch) that insist if the bell housing and clutch fork are stock the short bearing is correct. I don't seem to have enough throw to engage the clutch.
Is there an intermediate bearing length , (clutch house says NO) or do I need a different fork?
HELP! I don't want to pull this transmission a third time!

**LockDoc** · 08-01-2017, 10:20 AM

Quote:

Originally Posted by DangerDan

1971 C 10 came with 250 (6) cyl and Three speed
Changed to 327 High dome clutch and Muncie (4) speed
Issue is the long throw out bearing is too long and the Throw out bearing supplied with the clutch does not reach the fingers on the high dome clutch whne I depress the clutch pedal!
We have a very good clutch and drive line house here in Fort Wayne (Where i bought the clutch) that insist if the bell housing and clutch fork are stock the short bearing is correct. I don't seem to have enough throw to engage the clutch.
Is there an intermediate bearing length , (clutch house says NO) or do I need a different fork?
HELP! I don't want to pull this transmission a third time!

Are you at the end of the adjustment on the clutch rod? Are you sure all of the parts are installed? Make sure you have part #3 in the picture below installed.

LockDoc

DangerDan · 08-01-2017, 01:06 PM

Yes I have that installed. I think I have a deck height issue.

**AussieinNC** · 08-01-2017, 07:06 PM

What cross link do you have in place...the original 6 cylinder one or a V8 one?

There is also a difference in the clutch down rods from pedal to cross bar...also, where did you mount the cross bar on the engine...?

DangerDan · 08-01-2017, 08:24 PM

OK We figured out what was happening we thought the fork was running out of travel when in fact the linkage was bending. It was a 5/16" rod with a bend and evidently the high dome pressure plate requires a lot more pressure to depress. To answer your question I made a bracket that mounts to the block so that it would be in line with the mount that the Six cyl. used all good.... but I had to move one of the lever arms because it was direct interference with the headers. I maintained the same angle. Making a new rod out of 1/2" tubing.

I would like to see a Small Block Z bar if you have a picture.

**AussieinNC** · 08-01-2017, 08:31 PM

http://www.lmctruck.com/icatalog/cb/full.aspx?Page=152

32-6162 Rod End Link Kit...$ 99.95...

Cross link pics are on the board...use search panel and look for V8 cross link...

**AussieinNC** · 08-01-2017, 08:35 PM

There are also some hydraulic conversion kits around...

see this thread

http://67-72chevytrucks.com/vboard/s...d.php?t=668697

Jamar does a nice system...

**'68OrangeSunshine** · 08-01-2017, 10:59 PM

The tube on the V8 Z-Bar is narrower than the L6. Arms are about the same.
On a '71 K/1500 I have, we had to add extra length to the lower clutch push rod. We spliced about 6'' of Squarebody pushrod onto a '71 pushrod with a 3'' section of old gun barrel for a splice reinforcer. We had too short a T/O Bearing and didn't want to drop a Muncie SM 465 and NP205, just to change it out.
Still good, about 18 years later.

08-01-2017, 09:40 AM	#1
DangerDan Registered User Join Date: Aug 2015 Location: Fort Wayne, IN Posts: 39	Clutch & Throw out bearing issue 1971 C 10 came with 250 (6) cyl and Three speed Changed to 327 High dome clutch and Muncie (4) speed Issue is the long throw out bearing is too long and the Throw out bearing supplied with the clutch does not reach the fingers on the high dome clutch whne I depress the clutch pedal! We have a very good clutch and drive line house here in Fort Wayne (Where i bought the clutch) that insist if the bell housing and clutch fork are stock the short bearing is correct. I don't seem to have enough throw to engage the clutch. Is there an intermediate bearing length , (clutch house says NO) or do I need a different fork? HELP! I don't want to pull this transmission a third time!

08-01-2017, 07:06 PM	#4
AussieinNC Moderator Join Date: Jun 2017 Location: Cherryville, NC Posts: 2,170	Re: Clutch & Throw out bearing issue What cross link do you have in place...the original 6 cylinder one or a V8 one? There is also a difference in the clutch down rods from pedal to cross bar...also, where did you mount the cross bar on the engine...?

08-01-2017, 08:24 PM	#5
DangerDan Registered User Join Date: Aug 2015 Location: Fort Wayne, IN Posts: 39	Re: Clutch & Throw out bearing issue OK We figured out what was happening we thought the fork was running out of travel when in fact the linkage was bending. It was a 5/16" rod with a bend and evidently the high dome pressure plate requires a lot more pressure to depress. To answer your question I made a bracket that mounts to the block so that it would be in line with the mount that the Six cyl. used all good.... but I had to move one of the lever arms because it was direct interference with the headers. I maintained the same angle. Making a new rod out of 1/2" tubing. I would like to see a Small Block Z bar if you have a picture. Attached Images

08-01-2017, 08:31 PM	#6
AussieinNC Moderator Join Date: Jun 2017 Location: Cherryville, NC Posts: 2,170	Re: Clutch & Throw out bearing issue http://www.lmctruck.com/icatalog/cb/full.aspx?Page=152 32-6162 Rod End Link Kit...$ 99.95... Cross link pics are on the board...use search panel and look for V8 cross link...

08-01-2017, 08:35 PM	#7
AussieinNC Moderator Join Date: Jun 2017 Location: Cherryville, NC Posts: 2,170	Re: Clutch & Throw out bearing issue There are also some hydraulic conversion kits around... see this thread http://67-72chevytrucks.com/vboard/s...d.php?t=668697 Jamar does a nice system...

08-01-2017, 01:06 PM	#3
DangerDan Registered User Join Date: Aug 2015 Location: Fort Wayne, IN Posts: 39	Re: Clutch & Throw out bearing issue Yes I have that installed. I think I have a deck height issue.

08-01-2017, 10:59 PM	#8
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 7,158	Re: Clutch & Throw out bearing issue The tube on the V8 Z-Bar is narrower than the L6. Arms are about the same. On a '71 K/1500 I have, we had to add extra length to the lower clutch push rod. We spliced about 6'' of Squarebody pushrod onto a '71 pushrod with a 3'' section of old gun barrel for a splice reinforcer. We had too short a T/O Bearing and didn't want to drop a Muncie SM 465 and NP205, just to change it out. Still good, about 18 years later. __________________ Every 25 years I like to rebuild that 292, whether it needs it or not. Last edited by '68OrangeSunshine; 08-01-2017 at 11:08 PM.



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