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Old 07-01-2012, 11:30 AM   #1 (permalink)
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Default Sammi clutch issue?

New to the forum so hello to all. I just got a 88 JX Sammi and the clutch assy was making noise so I figured. Here's what was happening:
1. Let out on the clutch pedal in neutral and the vehicle felt like it bumped slightly forward.
2. The noise would go away when pedal was pushed in.
3. Shifted fine when still or moving.
4. Developed a quick scratching or scraping sound while moving forward or rolling down the road but, was intermitant sounded sorta like the parking brake pad was lightly rubbing a rotor but not constant.
5. Moved the vehicle a short distance and heard the short scratch and then made a hard bang sound and didn't want to move in gear or lurched when attempted.
6. Placed in neutral and could pushed it off the trail.
7. Looked underneath at the driveline and all was tight and secure I.E. drive shafts and u joints. Nothing leaking.
8. Vehicle was not in 4x4 use.
9. Engine runs great no issues there.
10. Brakes were released or park brake was off.

I'm guessing the clutch came apart in pieces. Pedal was not real stiff or hard to start. Any ideas?

Thank you in advance.

Last edited by GHOSTMAN; 07-01-2012 at 11:38 AM. Reason: missed some key points
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Old 07-03-2012, 12:45 AM   #2 (permalink)
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throw out bearing
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Old 07-06-2012, 11:23 AM   #3 (permalink)
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Quote:
Originally Posted by rey0176 View Post
throw out bearing
A throw out bearing would make that hard bang noise? I was thinking it might be inside the transmission. Just saying.
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Old 07-06-2012, 12:04 PM   #4 (permalink)
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Quote:
2. The noise would go away when pedal was pushed in.
It's not the release (throw-out) bearing. It's the tranny.
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Old 07-06-2012, 10:00 PM   #5 (permalink)
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Quote:
Originally Posted by Max View Post
It's not the release (throw-out) bearing. It's the tranny.
I enquired about this issue with a trans mechanic at a GMC dealer and was really reputable. In fact I see him every Friday. He said if it was making noise when the clutch pedal is up it's most likely the tranny. The action of the clutch assy when pushed in would make a noise. He believes it's in the front of the tranny and not the ouput end.

Well, off to locate a 5 spd tranny w/ clutch assy. that's ready to go and not a shot in the dark one.

Thanks for the response about this situation and will report what findings I run into.
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Old 07-07-2012, 08:19 AM   #6 (permalink)
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that is true.... i didnt read the whole story you had wrote. but either way you have to take it down and repalcing the clutch will be a throw out bearing and pilot bearing to replace. in the same time you can check the tranny too for play on the shafts if you do have play then rebuild the tranny if not it was just the throwout bearing.also change all the ggear oils in the transfer case and diffs while your at it too and the tranny.
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Old 07-07-2012, 11:15 PM   #7 (permalink)
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I'm going to inspect the Sammi again today (visual only). Is it a possibility the transfer could be the culprit too? Just trying to narrow it down before hauling it in to civilization to break it down.
I'm still wondering what the hard bang noise was or where it was coming from directly under the seat area. Some say the bearing on the front trans shaft came loose or broke causing it to hit hard making the noise.

I'm guessing nobody here has ever had that issue before to report on.

Thanks in advance.
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Old 07-09-2012, 10:18 PM   #8 (permalink)
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After detailed investigation I found the issue.
The shaft to the rear chunk was sloppy. I could move the whole axle by lifting and pulling the shaft up or down. The one part of the shaft that should slide in and out where a boot was evidently hasn't been greased and didn't move causing a bind at the chunk thus loosening up the backend. The pinion nut has came loose as it's sloppy when pulled on from the shaft. I'm hoping I can retighten the pinion nut, grease the shaft and tighten all U bolts on the springs. Any idea what the torque in inch lbs the pinion nut needs to be? Any other helpful ideas on this major adjustment I'm about to perform?
Thanks in advance.
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Old 07-10-2012, 09:11 AM   #9 (permalink)
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Although you could just tighten down the pinion nut and be done with it, there is probably some damage done already inside. Those gears have to be set precisely to work right without destroying each other. The loose pinion can damage the gears, bearings and seal. If you have driven like this for a while, I would rebuild the diff after checking the gears. The crush sleeve inside is not a reusable item... So once the pinion is torqued down (and the crush sleeve 'crushed') then the setting is good until something happens to that torque. After that the crush sleeve needs to be replaced when setting it up again. If you have never set up a differential before, get someone with experiance (and the right tools) to help you learn - or get it done by a professional.
Sorry, not an easy answer.
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Old 07-10-2012, 09:16 AM   #10 (permalink)
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+1

Bill you are spot on!

I think that the pinion BEARING is shot, thus requiring all that you mentioned for a proper diff set-up and any sort of rear end quiet operation and longevity of repair.
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