ok good ol boys, chevy clutch

ericlb · Jun 17, 2016

i got a interesting problem, and its annoying, the clutch on my 83 c-30 is sticky, just the first inch or so of travel from the floor, which makes it hard to fully depress it and also more annoying makes for a jumpy start, no feathering under load to start rolling its either dissengauged or its mostly engaged, now over the past year this clutch has been replaced, all of it and i mean from the engine crank, with a new flywheel to the peddle pad and everything under the dash, every bushing bolt and plastic washer, i use this truck a lot and it would be nice if it didnt use me, now one thing which does not exist is that big spring which goes between the stob under the dash to the pedal, is this the problem? what exactly does that missing garage door size spring do?

tiresntracks · Jun 17, 2016

That big spring should be your return spring and it will definitely affect the way the clutch engages. Another thing to check on those old Chevys is the cab mounts, if they're shot, they can put the clutch linkage in a bind.

Allan in NE · Jun 17, 2016

Did you replace the fork and the pivot ball?

Allan

old · Jun 17, 2016

I have some problems with the clutch in my 1980 Chev heavy half and it is caused by the fact the cab is very rusty and when you push the clutch down you can see the cab move just a little bit

ericlb · Jun 17, 2016

it may be that spring then [ i ordered one a bit ago simply because its the only piece i havent worked on yet lol ]the cab mounts on this truck are good they were replaced about 4 years ago this thing has a flatbed dump which i just went thru including the cylinder the truck has a great body, 1 year old paint too if i can just get this 1 last thing working, well the radio dont work but i dont use that anyway

D Slater · Jun 17, 2016

If I remember correct the big spring under dash makes it easier to hold the clutch pedal down and push it after the pedal gets down so far.

Goose · Jun 17, 2016

Is your main bearing seal leaking? I had that happen once, it made the clutch disc sticky.

Janicholson · Jun 17, 2016

The spring is an overcenter design that assists pushing the pedal own as the freeplay is used up in the first 1.5 inches of travel. It is not strong enough to overcome the pressure plate primary springs, but it keeps the pedal pressure under control. It does nothing when the pedal is all the way up, because it is over center. The free play should be as above. If much more, the pedal may travel so far that the clutch doesn't disengage. The throwout bearing should be clear of the fingers by at least 1/16" with the pedal all the way up. When pushing the pedal, the cab must not move, nor should the engine move forward! If they move, the pedal travel will be way out of specification because the movement will take up intended linkage motion. That is why many vehicles are now either hydraulic, or cable operated. Neither of which apply force to the cab or clutch housing. Jim

gajack · Jun 17, 2016

Check the engine motor mounts when engaging clutch, see a lot of movement?

ericlb · Jun 17, 2016

yes both of them , while i was in there i pulled the engine and tranny out as 1 piece and did it all while i could out on the floor

ok good ol boys, chevy clutch

ericlb

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tiresntracks

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Allan in NE

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old

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ericlb

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D Slater

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Goose

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Janicholson

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gajack

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ericlb

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