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08-09-2020 | #1 |
Join Date: Jun 2020
Location: Houston, TX
Posts: 183
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Are new throwout bearings available?
Looks like I have a very intermittent squeal from the pilot bearing. May wait till it gets a bit more repeatable / frequent but am reading up on parts alternatives and what R&R involves.
A common piece of advice is to replace the clutch, PP, and throwout/release bearing when everything is apart. With only 13K miles the clutch action feels fine and I am loathe to replace it unless it really looks bad upon removal. But the TOB may be a good idea. Not sure where to find a new TOB though! Jerry does not carry it. Rockauto and O'Reilly both list the AC Delco 614018 which seems to have the correct inside dia for the black label ZFs but sure doesn't look like the ZR-1 TOBs that I have seen. https://www.rockauto.com/en/moreinfo...sn=632&jsn=632 Any ideas? Edit: my car is a 1991. TIA. |
08-09-2020 | #2 |
Join Date: Aug 2006
Location: McLean, VA
Posts: 3,713
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Re: Are new throwout bearings available?
Below link is the correct throw out bearing for 90 to 92 (?). However, I am not sure of country of manufacture. Chinese version has been known to fail after the install. OEM versions come up for sale between $200 to 250 occasionally.
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08-09-2020 | #3 |
Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
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Re: Are new throwout bearings available?
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90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold. |
08-09-2020 | #4 |
Join Date: Aug 2015
Location: Magnolia, Texas
Posts: 884
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Re: Are new throwout bearings available?
I seriously doubt you have a worn out throw out bearing... I recommend you chat with Bill Boudreau at ZFDOC.. (ZR51 Performance). The TOB, assuming it's original, is a very durable piece. You can certainly blow through the clutch in 13,000 miles if not driven "well". TOB, would not be the weak link though.
Sent from my SM-G950U using ZR-1 Net Registry mobile app |
08-09-2020 | #5 | |
Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
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Re: Are new throwout bearings available?
Quote:
H
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90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold. |
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08-09-2020 | #6 |
Join Date: Jun 2020
Location: Houston, TX
Posts: 183
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Re: Are new throwout bearings available?
Thanks a lot for the article. I do have access to the Registry publications but I haven't read many back issues. Need to fix that omission! Wish I had read this in fact before I replaced my clutch fluid a few days back - (a) I didn't know what to make of the rubber bladder inside so ended up spilling a bunch of brake fluid, and (b) I used DOT 3 brake fluid like the cap said to! Anyway looks like my clutch is working ok, so I'll leave it alone for now.
As for the squeal, it's disappointing that "up to 25%" of the ZR-1s experience the pilot bushing spinning in the pocket, which I'm pretty sure is what mine is doing. It only happens at first start and only for a couple of seconds. I find I can minimize it by starting the car in neutral. Weird. |
08-10-2020 | #7 |
Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
Posts: 6,493
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Re: Are new throwout bearings available?
Couple pointers:
NOTE: I took the opportunity to change the clutch bearings when I changed flywheels "while I was in there", NOT because either had failed. Just sayin!
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Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry |
08-10-2020 | #8 | |
Join Date: Apr 2007
Location: Lake Bluff, IL
Posts: 2,067
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Re: Are new throwout bearings available?
Quote:
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2016 Long Beach Red Z06 #10281 "POPS Z" 1995 Polo Green #409 "WARP TEN"--Haibeck 350/510 package, 4.10s, Hurst, Stock Exhaust with QTP Cutouts --Sold but still running strong 1993 Quasar Blue #161 "HIL KING" --Sold but still running strong, now with more than 120,000 miles 1967 Marlboro Maroon/Saddle Corvette Coupe 300 hp/4-spd --Sold a long time ago ZR-1 Net Registry Founding Member #95 NCM Lifetime Member Favorite Quote--Attributed to Mickey Thompson: "Too Much Horsepower is Almost Enough" |
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08-16-2020 | #9 |
Join Date: Feb 2013
Location: Yakima Washington
Posts: 401
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Re: Are new throwout bearings available?
Additionally, I have always, when slowing down to a light using rpm match, sliped it into neutral without using the clutch.
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Jim 1990 Z # 2441 1959 c-1 230 HP 4 speed frost blue/silver 3 owner 2011 cts-v 556 HP, manual 6 speed 1955 chev 2dr ht PP 265 3 speed w/OD |
08-10-2020 | #10 |
Join Date: Apr 2004
Location: ATL. GA.
Posts: 2,170
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Re: Are new throwout bearings available?
Marc, replaced my pilot bearing about 5 years a go when doing the HP upgrade he installed the roller type at that time (his recommendation), 15k miles later never had any issues with it.
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Steve 1990 Steel Blue/Black #2355 1990 Red/Red #1473 1991 Quasar /Black #118 Sold 1991 Turquoise/Black #766 Parted Out 1993 Yellow/White #179 Sold 1990 Black/Gray #1361 Headers/4:10s Sold |
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