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10-07-2020 | #1 |
Join Date: Aug 2005
Location: Cali-rodo
Posts: 270
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Looking for a C4 shop in the Cookville, TN area for basic clutch/exhaust work.
Long story short, After sitting for 10 years, Marcs shop did a great job of getting my parents 91 Quasar ZR-1 back on the road in quick order for my brother. He had a blast driving it back to TN and turning the big 20,000 in the process. The VERY next time he got in for a spin it is producing, using his description, a spinning pilot bushing.... best I can tell.
He works long hours and does not have access to a lift. Should be a basic fix for just about ANY C4 corvette shop, maybe add C-beam plates while they are in there. Any recommendations between Nashville and Knoxville? |
10-07-2020 | #2 |
Join Date: Jul 2020
Location: Nashville TN
Posts: 320
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Re: Looking for a C4 shop in the Cookville, TN area for basic clutch/exhaust work.
The pilot bushing is pressed in. I doubt it is spinning!
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10-08-2020 | #3 |
Join Date: Aug 2005
Location: Cali-rodo
Posts: 270
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Re: Looking for a C4 shop in the Cookville, TN area for basic clutch/exhaust work.
I am aware of how it was installed from the factory. Per Mr. Heibeck, it appears it can spin.
"The Throw Out Bearing. We have never seen a noisy throw out bearing. Every time we have encountered aproblem with noise or high frequency vibration when engaging the clutch it was causedby the pilot bearing. About 25% of the ZR-1 pilot bearings fail in a mode where the bronze bushing spins in the crankshaft. These bearings can be removed with a finger.Sometimes they fall out when the transmission is removed. We have had a problem withreplacement bronze bushing spinning in the crankshaft. GM had a problem with the bronze bushing too. Service bulletin 92-230-6 was issued in June of ?92. It specifies replacement with a fluted bronze bushing. Service bulletin 46-73-02 was issued inOctober of ?94. to specify a roller pilot bearing. GM part number 14061685 AC-Delcopart number CT1078." |
10-10-2020 | #4 |
Join Date: Sep 2020
Location: N. Alabama
Posts: 5
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Re: Looking for a C4 shop in the Cookville, TN area for basic clutch/exhaust work.
I can only relate my experience with the ZF6 in my '96 LT4. At the track I heard a spinning/scraping noise inside the bell housing. It was the clutch arm hitting the clutch because the pivot ball was getting loose and interfering, IIRC. In any case I had to go into the bell housing and tighten the pivot ball bolt. It has a two part bolt system sort of, one on each side of the bell housing wall, that tighten into each other. Again, IIRC. It has been years since I repaired it.
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10-10-2020 | #5 | |
Join Date: Aug 2005
Location: Cali-rodo
Posts: 270
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Re: Looking for a C4 shop in the Cookville, TN area for basic clutch/exhaust work.
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