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I have a real head-scratcher of a clutch problem,
#687127 Mon Oct 18 2010 05:57 AM
Joined: Dec 2008
Posts: 15
A
New Guy
I have a 64 Chevy Short Bed Fleetside truck running a 94 Z28 T-56. Ive come to you guys looking for help because this is such a sweet tranny, I can't believe I'm the first one to try this swap, and Im at my wits end!

The truck has all the stock clutch, pressure plate, flywheel, TO bearing, and slave that is correct for the Z. In order to fit up cleanly to the firewall and easily attach to the clutch pedal linkage, Im using a stock 64 Chevy manual brake master for a clutch master. I believe this MC has a 1 bore, and the slave has a bore. But Ive got several issues. There is about 6 of pedal travel in total from the top of the travel to the floor. When I depress the clutch, for the first 3-1/2 or 4, it feels like it isnt even hooked up, like it is just return spring pressure. Then it comes up firm, like it is building pressure, and in only about -3/4, I can finally shift it into gear. I continue to slowly depress the clutch, and in another , I get the most God-awful racket it sounds like the forks are into the pressure plate and I still have an inch of pedal left!

So my questions what do I need to do to get a decent pedal? Id like 1-1/2 or so of free play at the top, and full disengagement 2-3 below that, if possible. This would give me about 2-3 of functional working stroke. Is this attainable with a hydraulic clutch? And what is causing the horrendous racket? Is the master over-extending the slave somehow? How do I troubleshoot this thing?

I sure need some advice here, guys Im about to pull my hair out! Thanks! Bill


1964 Chevy Custom Fleetside Shortbed

Experience allows you to recognize a mistake when you make it again.
Re: I have a real head-scratcher of a clutch problem,
Albuquerque Bill #687135 Mon Oct 18 2010 07:18 AM
Joined: Mar 2009
Posts: 786
P
Shop Shark
did you bleed the air out
ron

Re: I have a real head-scratcher of a clutch problem,
padresag #687251 Mon Oct 18 2010 08:12 PM
Joined: Dec 2008
Posts: 15
A
New Guy
There doesn't seem to be any air in it, Ron, but there is no bleedewr valve n the slave s I can't confirm it. I'm going to go get one of those Mi-T-Vac contraptions and try it - see if I can suck a bubble or two out. I'll let you know... Thanks for the reply.

Bill


1964 Chevy Custom Fleetside Shortbed

Experience allows you to recognize a mistake when you make it again.
Re: I have a real head-scratcher of a clutch problem,
Albuquerque Bill #687265 Mon Oct 18 2010 09:26 PM
Joined: Jun 2004
Posts: 8,287
W
Master Gabster
Watch the slave cyl. rod as you push in the pedal to see where it starts to move. If it starts moveing as soon as you move the pedal then the rod length off the slave cyl. needs adj. or modifiing. If it doesn't move then you have air in the system. Find out what size the MC was on the Camero. There may be too much difference in sizes causeing too much motion in the clutch fork.


They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.

1972 Chevy c10 Cheyenne Super
Re: I have a real head-scratcher of a clutch problem,
Wrenchbender Ret. #687271 Mon Oct 18 2010 09:59 PM
Joined: Oct 2003
Posts: 5,161
O
Cruising in the Passing Lane
The hydraulic clutch I drive most often doesn't feel any different than the mechanical linkage type.

I agree with Wrenchbender, you may need to change the master cylinder to match what was in the Camaro.


Its true, I really don't do anything but browse the Internet looking for trouble...
Steve@OldSub.com . www.OldSub.com . www.MaxwellGarage.com . www.OldGasTowRigs.com
'55 1st GMC Suburban . '54 GMC 250 trailer puller project. '54 GMC 250 Hydra-Matic . '54 Chevy 3100 . '47 Chevy COE . and more...
Re: I have a real head-scratcher of a clutch problem,
OldSub #687292 Mon Oct 18 2010 11:33 PM
Joined: Jun 2004
Posts: 8,287
W
Master Gabster
If the slave cyl. is like the ones in the trucks in that era, the bleeder is an allen scrwe on top of the cyl. near the closed end.


They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.

1972 Chevy c10 Cheyenne Super
Re: I have a real head-scratcher of a clutch problem,
Wrenchbender Ret. #687350 Tue Oct 19 2010 04:15 AM
Joined: Mar 2004
Posts: 3,095
Shop Shark
you might be pushing the pressure plate fingers into the disc's springs because there's too much travel. Check it with a helper,
Scott


Scott Ward

2 1948 1.5-ton Loadmasters
The red one [stovebolt.com] and The snow pusher [stovebolt.com]
1 1950 3100
1 1955.1 Chevy 6500 [stovebolt.com]
1 1954 Chevy 6500 2-Ton [stovebolt.com]
1 1955 1st Series COE 5700 [stovebolt.com]
1 1963 K20 [stovebolt.com] (454)
1 1964 C10 (350)
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1953 and a 1956 Ford F800 [stovebolt.com]

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Re: I have a real head-scratcher of a clutch problem,
48bigtrucks #687605 Wed Oct 20 2010 01:04 AM
Joined: Dec 2005
Posts: 540
A
Shop Shark
I just have to say that your not the first to do this swap. My brother has the same tranny in his 66' C10. I can talk to him about your problem and see what he did.


58' 3200 235 3-speed/OD

Re: I have a real head-scratcher of a clutch problem,
ApacheFiend #694737 Sun Nov 14 2010 05:10 AM
Joined: Apr 2008
Posts: 256
B
Shop Shark
I have a clutch ? / problem i recently bought a 49 suburban stock 6cly 3 on the tree just got it running today when to put it in gear to see if it would move and NODDA felt like the trans or atleast the linkage was going in and out of every gear but it wont move attempt to move make any different noises even in gear clutch pedal out reving it up no movment or noise?? any advice im new to clutch driven them before never worked on them LOL

Last edited by bigtony55; Sun Nov 14 2010 07:24 AM.
Re: I have a real head-scratcher of a clutch problem,
bigtony55 #694752 Sun Nov 14 2010 05:49 AM
Joined: Nov 2001
Posts: 1,747
D
Shop Shark
This is just a possibility... The closed driveline front u-joints are kind famous for being the weak point. If its snapped, you wont go anywhere in any gear, all youll hear is clunking,,or no noise. You also wont be able to see it from underneath, as youll have to slide the "bell" back to expose the u-joint assembly.

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