Clutch and Clutch Linkage - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72longhornTX · 01-18-2008, 01:17 PM

Does anyone have any suggestions on what to do with the clutch?
I have a 350 and a stock 3 speed transmission with 3 on the column.
We cannot get the clutch to engage even with the linkage adjusted all the way.
We have managed to get the shifter linkage right but cant figure out the clutch.
Any pictures or tips would be great

CCCC · 01-18-2008, 04:42 PM

Without pics or more detailed info on the situation it is difficult to give good ideas, but off the top it sounds as though there is not enough travel in the linkage - when pedal is released there is not enough rod travel to enable the pressure plate/disc/flywheel to mate. If it is not a rod travel or rod length issue, then it is probably internal to the clutch mechanism/fork/release bearing aspects. This is just a WAG with the info available.

dznucks · 01-18-2008, 10:31 PM

your problem might be with the clutch fork pivot ball. you can adjust it on the bell housing. it will be located on the upper drivers side of the bellhousing, on the flat surface that the tranny/bellhousing mate. it might be partially covered by the transmission mounting flanges.

did you replace the clutch or flywheel or anything eles?

Eichorst69 · 01-19-2008, 07:14 AM

There are two style throwout bearings, a "short" one and a "tall" one which would make a difference in the travel ???

Rob

JimKshortstep4x4 · 01-19-2008, 07:33 AM

The throwout bearings are matched to the pressure plate. The long one if installed where a short one is needed will keep the clutch from engaging.

The short one if installed where a long one is needed will keep the clutch from releasing.

Jim

Jim_PA · 01-19-2008, 08:22 AM

I suppose you mean that you can't get the clutch to dis-engage?

Do you have the right clutch fork?

72longhornTX · 01-19-2008, 09:31 AM

well we bought a new fork and it matches the old one perfect and we have a whole new clutch.
The clutch wont engage at all. We can get it in neutral but if we put it in gear and press the clutch in the truck wont move.

From talking to the auto tech teacher he thinks its the throw out bearing.

My friend is going to check that today as i have come down with the flu.

454_72_4X4 · 01-19-2008, 09:47 AM

Quote:

Originally Posted by 72longhornTX

but if we put it in gear and press the clutch in the truck wont move.

I'm thinkin this is a typo but that's the way a clutch is supposed to work!LOL

I think Eichorst69 and JimKshortstep4x4 are on the right track. Hard to explain without pics though.

There's 2 different styles of throwout bearings and 2 different styles of pressureplates that match them. (Assuming we're talking about diaphramn pressure plates)
A long style throwout bearing mates to a flat style pressure plate, and a short stlye throwout bearing mates to an extended finger style pressureplate.

Assuming a new clutch installed?

I've also seen the clutch disc installed backwards. Wrong side facing the flywheel. But this causes the clutch to not release.

01-18-2008, 01:17 PM	#1
72longhornTX Registered User Join Date: Sep 2007 Location: Houston, TX Posts: 115	Clutch and Clutch Linkage Does anyone have any suggestions on what to do with the clutch? I have a 350 and a stock 3 speed transmission with 3 on the column. We cannot get the clutch to engage even with the linkage adjusted all the way. We have managed to get the shifter linkage right but cant figure out the clutch. Any pictures or tips would be great

01-18-2008, 04:42 PM	#2
CCCC Registered User Join Date: Mar 2007 Location: San Pedro River, SE Arizona Posts: 734	Re: Clutch and Clutch Linkage Without pics or more detailed info on the situation it is difficult to give good ideas, but off the top it sounds as though there is not enough travel in the linkage - when pedal is released there is not enough rod travel to enable the pressure plate/disc/flywheel to mate. If it is not a rod travel or rod length issue, then it is probably internal to the clutch mechanism/fork/release bearing aspects. This is just a WAG with the info available. __________________ CCCC 67 Sting Ray Coupe 327 4sp; 68 K10 Suburban 327 4sp; 69 K20 Lifted 383 4sp; 69 C80 Fire Truck 478 V6 5sp/2sp; 69 C20 Longhorn 327 4sp; 70 C30 Wrecker 350 4sp; 70 C30 Flat Bed 350 4sp; 71 C20 LWB 350 4sp; 72 K5 Blazer 350 4sp; 72 C30 Flat Bed Gooseneck Hauler with sleeper 350/TH400; 72 C20 Longhorn 402 4sp; 52 Mack LTL Supercharged Cummins 5sp x 3sp; 01 Dodge 5.9 HO Cummins 6spd; 02 Safari Trek 2430 8.1 Vortec on Workhorse Chassis; 03 Silverado 2500 HD 4wd Duramax/Allison Moved but still in the family 70 C20 Custom Camper 350/TH350; 72 K5 Blazer CST Highlander 350/TH350 Recently sent to new homes 72 C30 MoHome 402 4sp; 72 K5 Blazer Conv 350 4sp; 75 GMC 6000 Aerial 350 w Allison; 72 GMC 3500 Utility 350 4sp; 70 GMC 3500, 350 4sp

01-18-2008, 10:31 PM	#3
dznucks Registered User Join Date: Feb 2006 Location: Smyrna, Ga Posts: 1,647	Re: Clutch and Clutch Linkage your problem might be with the clutch fork pivot ball. you can adjust it on the bell housing. it will be located on the upper drivers side of the bellhousing, on the flat surface that the tranny/bellhousing mate. it might be partially covered by the transmission mounting flanges. did you replace the clutch or flywheel or anything eles?

01-19-2008, 07:14 AM	#4
Eichorst69 Registered User Join Date: Jan 2007 Location: South Florida Posts: 158	Re: Clutch and Clutch Linkage There are two style throwout bearings, a "short" one and a "tall" one which would make a difference in the travel ??? Rob

01-19-2008, 07:33 AM	#5
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: Clutch and Clutch Linkage The throwout bearings are matched to the pressure plate. The long one if installed where a short one is needed will keep the clutch from engaging. The short one if installed where a long one is needed will keep the clutch from releasing. Jim __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC

01-19-2008, 08:22 AM	#6
Jim_PA Registered User Join Date: May 2005 Location: PA Posts: 2,696	Re: Clutch and Clutch Linkage I suppose you mean that you can't get the clutch to dis-engage? Do you have the right clutch fork?

01-19-2008, 09:31 AM	#7
72longhornTX Registered User Join Date: Sep 2007 Location: Houston, TX Posts: 115	Re: Clutch and Clutch Linkage well we bought a new fork and it matches the old one perfect and we have a whole new clutch. The clutch wont engage at all. We can get it in neutral but if we put it in gear and press the clutch in the truck wont move. From talking to the auto tech teacher he thinks its the throw out bearing. My friend is going to check that today as i have come down with the flu.

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