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05-21-2008, 07:44 PM | #1 |
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Location: Ontario, Canada
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Shutter on clutch release.
I have a 1970 C10 that shutters badly when I back up an incline. It shutters when the clutch grabs and the truck starts to move. I had the clutch replaced and broken motor mounts replaced, but problem is still there. The warped flywheel was also trued up. The truck is a shortened LWB, leaf spring, 3 on the tree. The transmission has no rear mount to the frame, nor does the driveshaft. The truck didn't always shutter this way, so I don't know what the problem may be.
Does anyone have any ideas for me? thanks |
05-21-2008, 07:54 PM | #2 |
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Location: Knoxville Tenn.
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Re: Shutter on clutch release.
Rebuilt clutch-going to a "new" plate and disc will solve it.
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56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
05-21-2008, 08:08 PM | #3 |
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Re: Shutter on clutch release.
x2. sounds like a worn pressure plate
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Rottenwood Garage 1970...71...72 C1500 aka Orange aka Sideshow Bob 540 BB Straub Roller Cam, AFR Magnums, XP 950, TKO 600 2 Tons of Fun |
05-21-2008, 08:24 PM | #4 |
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Re: Shutter on clutch release.
Backing up always seems worse, we have 2 trucks with manuals. However I fought this on our 68 for quite a while, still does it some though. Went through two flywheels, all reground, 3 sets of new pressure plates and disks.
With the inspection cover off, engine runningl carefully look and see if the disk rotates smoothly or goes up and down. Turns out the replacement disks I was getting, the lining was not centered with the hub. A close look at it and even another new one, you could see the gap between the center spring hub and the lining was not centered. They finally let me exchange the new disk in the kit with a rebuilt dsik that was centered. Good thing they warranted all the parts. Parts were from NAPA. Put the 99 dollar special from Norhtern auto parts on our 1970 C10, No problems with that one. I guess you need to inspect the disks real close to be sure they are centered.
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1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0 Last edited by Green Machine; 05-21-2008 at 08:27 PM. |
05-21-2008, 09:59 PM | #5 |
1970 Daily Driver
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Re: Shutter on clutch release.
I put a new clutch and flywheel in from Napa and my truck shutters on clutch release when going from a dead stop into first gear then it is fine after that. Some times it is really bad and some times it is barely noticeable. My motor mounts are new also. If I have the same problem with my clutch plate being offset will I need to change out my flywheel again? It has been like this for 3 years trying to figure this one out I hope it has not ruined it.
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05-21-2008, 10:15 PM | #6 |
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Re: Shutter on clutch release.
Remember,guys, that there is a differance between new and rebuilt.
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56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
05-21-2008, 10:18 PM | #7 |
Keepin it runnin!
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Re: Shutter on clutch release.
I had that exact same problem.....replaced the clutch, pressure plate, pilot shaft bushing, and throw out bearing. Scuffed up the flywheel (It looked beautiful after 200k miles (all my miles) proud to say) and it worked flawlessly ever since.
Frank
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1970 K-5 4X4 Blazer 1970 K-20 4X4 Long Bed "Liberty Means Responsibility, that is why most men dread it" |
05-21-2008, 10:31 PM | #8 |
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Re: Shutter on clutch release.
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Jared 67 C10 CST Short Fleet Big Window 65 C10 Custom Short Fleet Big Window 67 Camaro RS |
05-21-2008, 11:06 PM | #9 |
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Re: Shutter on clutch release.
I'm on my THIRD clutch/pressure plate from NAPA, with two separate re-surfaced flywheels, and still have moderate to severe chatter. I guess I'm going to suck it up and pay for one from RAM or Hayes or someone like that. I've looked at motor mounts, tranny mounts, u-joints, everything. I don't know what else it could be besides poor quality clutch/pressure plate.
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05-21-2008, 11:11 PM | #10 |
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Re: Shutter on clutch release.
Be sure to replace the pilot bushing! Slop in the shaft will amplify any clutch chatter.
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Jared 67 C10 CST Short Fleet Big Window 65 C10 Custom Short Fleet Big Window 67 Camaro RS |
05-21-2008, 11:32 PM | #11 |
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Re: Shutter on clutch release.
Don't know if we are helping Mark B any, but it looks like NAPA has some clutch problems. I think Napa pressure plates are ok but the disks, atleast the 11 inch Chevys suck. I went through three sets under warantee. The NEW disks were out of round. The REBUILT disk I traded them for - and is in there now - actually ran true.
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1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0 Last edited by Green Machine; 05-21-2008 at 11:35 PM. |
05-21-2008, 11:46 PM | #12 |
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Re: Shutter on clutch release.
If the flywheel was badly heat checked and the hard spots go deep enough all the resurfacing in the world won't help. Common things that happen to cause the same problem you had are, the fly wheel is no longer serviceable and the 12 year old cutting it at NAPA doesn't know that it should be replaced. Even the smallest amount of grease on your fingers with cause it to heat check and hard spot the flywheel. Pilot bearing should always be replaced with the clutch disk.. In 40 years and probably 200 clucth jobs I have never had one come back that I replaced the entire assembly. pilot , flywheel, throw out, and clutch and pressure place, AND buy new. A resurfaced pressure plate is as bad as a resurfaced flywheel.
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05-22-2008, 04:25 AM | #13 |
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Re: Shutter on clutch release.
This is all really helpful. I hate to think the new (actually, Ill have to check if they but in a rebuilt) clutch is defective, but it all makes good sense. Thanks everyone. Any more opnions are still welcome.
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05-22-2008, 04:51 AM | #14 |
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Re: Shutter on clutch release.
The reason a rebuilt disc does not work sometimes is that the center springs are not replaced. These springs are what take up the shock when you engage the clutch. If they are weak, they with catch and release to soon so that the disc slips back and forth.
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56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
05-23-2008, 09:45 PM | #15 |
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Re: Shutter on clutch release.
Let me qualify what I put in;
Heavy Duty 12" clutch kit from NAPA. Old Pilot bushing was worn pretty bad, I suspect that was the culprit. Real pain getting old bushing out. Frank
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1970 K-5 4X4 Blazer 1970 K-20 4X4 Long Bed "Liberty Means Responsibility, that is why most men dread it" |
05-23-2008, 10:53 PM | #16 |
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Re: Shutter on clutch release.
"pain"--next time fill hole with heavy grease and take a used front shaft ans insert it in bushing hole and drive out with hammer (add grease as needed).
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56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer Last edited by jhow66; 05-23-2008 at 10:53 PM. Reason: spelling |
05-24-2008, 03:27 AM | #17 |
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Re: Shutter on clutch release.
i just put a new ac delco clutch in ym truck turned the fly wheel no problems. after all ym problems with after market parts everything will be acdelco for my chevy and motor craft for my f-150
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05-24-2008, 01:57 PM | #18 | |
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Re: Shutter on clutch release.
Quote:
Frank
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1970 K-5 4X4 Blazer 1970 K-20 4X4 Long Bed "Liberty Means Responsibility, that is why most men dread it" |
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