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Old 04-19-2001, 10:44 AM   #1
Jon Bogert
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Member#: 1133
Join Date: Mar 2000
Location: SE PA
Vehicle:
09 GTR, 02 996 C4S
95 993 C4, 71 911, 04 STI

Lightbulb Crank pulley out of round!

While preparing to install the turbo, my mechanic (Bert Arano at Union 7) was chasing down a strange engine vibration that I've been noticing for the past 1000 miles or so. He'd given it a quick look before, with no success. This time he really started tearing things apart, since we didn't want to install the turbo if everything wasn't perfect.

Basically the vibration was in time with the motor, but it was only audible at certain RPMS--it appeared to resonate most at 2500-3000. It disappeared completely when the A/C clutch was engaged.

The only thing Bert found was that the crank pulley was out of round with about .020 or radial runout. This would have the effect of making the belt slightly tighter or looser with each revolution. I have no idea what the tolerances are, but he ordered a new pulley to compare. We'll see if that solves it.

Any comments?
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Old 04-19-2001, 01:17 PM   #2
Jon Bogert
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95 993 C4, 71 911, 04 STI

Post

Stock pulley.
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Old 04-19-2001, 01:54 PM   #3
gavin
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That's quite a bit for a high RPM pulley, especially since our engines don't use an intertial dampener.
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Old 04-20-2001, 12:59 AM   #4
John2.5RS
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Question

Is this an aftermarket or a stock pulley?
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Old 04-20-2001, 01:44 PM   #5
t.rod
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2000 Impreza
2001 Dodge 2500

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On a stock pulley? That's crazy. I thought you had an after market pulley like Unorthodox pulley.
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Old 04-20-2001, 01:48 PM   #6
Frank
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i just sold a barely used UR pulley for 130 with belts shipped. Not sure about warranty issues but $110 for the stocker sounds like a stroke job.
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Old 04-20-2001, 02:07 PM   #7
Jon Bogert
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Join Date: Mar 2000
Location: SE PA
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09 GTR, 02 996 C4S
95 993 C4, 71 911, 04 STI

Post

Of course it's a stroke job--it's from the dealer! I'm sure it would have been cheaper via mail order, but understand the car is in the shop taking up a bay, waiting for a turbo install. Saving a few bucks was not my primary concern here, and the local dealer had it in stock.
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Old 04-20-2001, 02:25 PM   #8
mpaone
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and 71' VW Gulf Beetle

Have a Nice Day?

Jon,

I wish I'd seen this post earlier. I would've sent you my stock pulley for shipping costs.

-Mike.
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Old 04-21-2001, 12:10 AM   #9
Jon Bogert
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Member#: 1133
Join Date: Mar 2000
Location: SE PA
Vehicle:
09 GTR, 02 996 C4S
95 993 C4, 71 911, 04 STI

Post

Got the new one just now. It's less than .005 from perfect. We'll see if it gets rid of the vibration.

Now that I think about it, this should be covered under warranty (car has 11k miles). The problem is, no dealer on the planet would spend the 5 hours checking everything that moves under the hood, looking for the source of the vibration. Plus the pulley is ~$110. Can a non-dealer repair shop do warranty work? Maybe I should submit a bill...
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Old 04-21-2001, 12:27 AM   #10
ColinL
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'01 Erion CBR 929

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You're hosed unless a friendly dealer wants to process the warranty claim on it for you.
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