Clutch Fork Grinding - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Trakter · 11-21-2017, 08:24 PM

Hey guys,
I've lurked around here for he last few years and have always been able to find a thread regarding the problem I had... until recently. So I figured I'd join up and ask away.

I have a 1977 K10 that was originally a 350/SM465/205. I have since swapped a 6.2 diesel from an 83 K5, as well as converted to hydro clutch. I have used a factory hydro bell housing, factory pedals and oem replacement slave and master cylinders. I used a flywheel, clutch fork and clutch set from Oreilly's for a 1985 k10 6.2 diesel. Master cylinder placement was eyeballed from pictures as I had nothing in person get measurements on.

The issue I am having is that the clutch fork is grinding on the pressure plate. When I apply pressure to the clutch pedal the grinding stops. I think it may be as little as 1/4 inch of movement that silences the noise, it doesn't take much.

I am trying to figure out what is out of whack. I remember having some issues with the pilot bushing at first, and I did not do any sort of bench bleeding to the slave or master cylinders. Could it be the master cylinder placement?
Open to all thoughts and ideas.
thanks,
John

4x4k30 · 11-21-2017, 08:35 PM

did you use a new ball stud and new clutch fork ? if not that's probably your problem they wear and get sloopy and noisy

Trakter · 11-21-2017, 08:42 PM

Quote:

Originally Posted by 4x4k30

did you use a new ball stud and new clutch fork ? if not that's probably your problem they wear and get sloopy and noisy

New clutch fork yes. New ball stud no. I can definitely try that.

sweetk30 · 11-22-2017, 08:57 AM

had the same problem years ago .

1984-older is 1 clutch fork for mech linkage . pic = old rusty one.

1985-up is hydraulic fork for hydro style . pic = new shinny one .

there both bent in different ways and also depending on the style of clutch can rub the fork . if using 1985-up hydro fork you cant use 3 finger clutch cause it rubs the fork with the deeper pressure plate design . i had to use a oem style multi finger pressure plate and problem solved .

here is a few pics of the difference i found after pulling my trans/tcase for a second time.

Trakter · 11-23-2017, 02:26 AM

Very interesting, my fork is grinding in the exact location as in your picture and I'm using the "3 finger" style clutch. I'll swap in a diaphragm style clutch and see if that does the trick. Thanks!

sweetk30 · 11-23-2017, 09:44 AM

yep 3 finder is taller than diaphragm = hits the fork .

11-21-2017, 08:24 PM	#1
Trakter Registered User Join Date: Nov 2017 Location: Cen CAL Posts: 3	Clutch Fork Grinding Hey guys, I've lurked around here for he last few years and have always been able to find a thread regarding the problem I had... until recently. So I figured I'd join up and ask away. I have a 1977 K10 that was originally a 350/SM465/205. I have since swapped a 6.2 diesel from an 83 K5, as well as converted to hydro clutch. I have used a factory hydro bell housing, factory pedals and oem replacement slave and master cylinders. I used a flywheel, clutch fork and clutch set from Oreilly's for a 1985 k10 6.2 diesel. Master cylinder placement was eyeballed from pictures as I had nothing in person get measurements on. The issue I am having is that the clutch fork is grinding on the pressure plate. When I apply pressure to the clutch pedal the grinding stops. I think it may be as little as 1/4 inch of movement that silences the noise, it doesn't take much. I am trying to figure out what is out of whack. I remember having some issues with the pilot bushing at first, and I did not do any sort of bench bleeding to the slave or master cylinders. Could it be the master cylinder placement? Open to all thoughts and ideas. thanks, John

11-21-2017, 08:35 PM	#2
4x4k30 Registered User Join Date: Jun 2003 Location: ga Posts: 630	Re: Clutch Fork Grinding did you use a new ball stud and new clutch fork ? if not that's probably your problem they wear and get sloopy and noisy __________________ 4x4k30 if trouble was money i would have plenty

11-22-2017, 08:57 AM	#4
sweetk30 Registered User Join Date: May 2012 Location: horseheads,ny rust belt Posts: 2,794	Re: Clutch Fork Grinding had the same problem years ago . 1984-older is 1 clutch fork for mech linkage . pic = old rusty one. 1985-up is hydraulic fork for hydro style . pic = new shinny one . there both bent in different ways and also depending on the style of clutch can rub the fork . if using 1985-up hydro fork you cant use 3 finger clutch cause it rubs the fork with the deeper pressure plate design . i had to use a oem style multi finger pressure plate and problem solved . here is a few pics of the difference i found after pulling my trans/tcase for a second time. Attached Images __________________ 77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great.

11-23-2017, 02:26 AM	#5
Trakter Registered User Join Date: Nov 2017 Location: Cen CAL Posts: 3	Re: Clutch Fork Grinding Very interesting, my fork is grinding in the exact location as in your picture and I'm using the "3 finger" style clutch. I'll swap in a diaphragm style clutch and see if that does the trick. Thanks!

11-23-2017, 09:44 AM	#6
sweetk30 Registered User Join Date: May 2012 Location: horseheads,ny rust belt Posts: 2,794	Re: Clutch Fork Grinding yep 3 finder is taller than diaphragm = hits the fork . __________________ 77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great.



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