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05-23-2019
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#1 |
 Join Date: Jan 2004
Location: Portland, OR
Posts: 1,057
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Pulley Failure
So a couple of years ago my tensioner went bad and I rebuilt it using a combination of stuff including some L98 parts and this aluminum pulley from UPR products (the pulley specs as a 85-93 Mustang ultra light tension/idler pulley). I remember I followed the tensioner rebuild project of someone on here, so if you have this pulley I suggest you check it. I can't think of any reason other than poor build quality as the cause, there are actually several holes although you can only see the one in the pic. The belt shows some damage too, I was noticing some odd coolant temp and voltage fluctuations which is why I started poking around. Guess I'll go back to the factory pulley.
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Robert ZR-1 Net Registry Oregon State Director 91 ZR-1 #431 Black/Black LPE 368 |
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05-23-2019
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#2 |
 
Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
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Re: Pulley Failure
Bearing failure?
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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05-23-2019
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#3 | |
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Join Date: Jan 2004
Location: Portland, OR
Posts: 1,057
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Re: Pulley Failure
Quote:
Possibly... I have been noticing a silvery oily residue under the air horn and around the general vicinity of the belt. Although I think that is from a leak in the A/C system which is another area I need to address and that could also account for belt slippage.
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Robert ZR-1 Net Registry Oregon State Director 91 ZR-1 #431 Black/Black LPE 368 |
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05-23-2019
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#4 |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,708
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Re: Pulley Failure
LB,
Looks like it wasn’t worth the extra hp.
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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05-23-2019
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#5 |
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Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
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Re: Pulley Failure
Judging from the hole in the pulley (which is aluminum) looks like it froze and the belt wore a hole in it, might be the source of your silvery residue?
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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05-23-2019
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#6 | |
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Join Date: Jan 2004
Location: Portland, OR
Posts: 1,057
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Re: Pulley Failure
Quote:
Hmmm, that's a good possibility
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Robert ZR-1 Net Registry Oregon State Director 91 ZR-1 #431 Black/Black LPE 368 |
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05-23-2019
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#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: Pulley Failure
Quote:
Bob: I replaced mine with a GM pulley for a C4 LT1. Works no for over 10 years! Also, Jerry's Gaskets has ZR-1 pulleys, IIRC.
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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 |
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05-23-2019
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#8 |
Join Date: Apr 2007
Location: Northern VA
Posts: 2,661
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Re: Pulley Failure
After looking closely at the photo appears it could have started as fatigue crack.
Is the center section of the pulley solid or spoked? Sent from my iPhone using ZR-1 Net Registry
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Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake |
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05-23-2019
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#9 |
 Join Date: Nov 2011
Location: Dunbarton NH
Posts: 7,490
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Re: Pulley Failure
Pretty sure Jim Voter had that exact same pulley fail on the way home from BG
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05-23-2019
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#10 |
Join Date: May 2010
Location: Japan
Posts: 3,582
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Pulley Failure
It’s hard to imagine that billet aluminum is weaker than plastic (stock) and I agree it has to be bearing failure with a seize that heated and burned by the belt friction. It would seem that would be noticeable though. I’m tempted to go back to stock myself. I guess another reminder to make America great again and we need better quality parts overall and stop outsourcing if this is from China.
I can’t remember the Dynomite post. Was it bigger and needed and larger belt too? If same sized belt used it could cause more tension on the pulley than it should have? Thanks for sharing since some of us did this mod. Sent from my iPhone using ZR-1 Net Registry
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Craig "ZR-1 NO KA 'OI" "ZR-1 ICHIBAN" 1995 #228 Black/Black with Dunn Heads ZR-1 owner since September 2003 ZR-1 Net Registry Founding Member #0074 NCM Lifetime Member #2048 
Last edited by HAWAIIZR-1; 05-24-2019 at 06:11 PM. |
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