Miata Mailing List: May 1996, Message #113


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   From: Sean Archer 
Subject: Re: The crank problem with 90s
   Date: Thu, 2 May 1996 14:46:20 -0400


At 10:33 PM 4/24/96 -0400, you wrote:
>On Thu, 18 Apr 1996, Gus Harris wrote:
>
>> Just had another thought about the crank problem.  Any of you folks with 91s
>> on...have you looked at your "outer pulley" with the engine idling.  Is it
>> spinning perfectly concentric?
>> 
>> Gus
>> GHARRIS@UWF.EDU
>
>
>I looked at mine last week when it came out of storage. No perceptable 
>wobble at 49000 km. (30448 miles)
>
>
>
The crank pully on my 1990 didn't appear to have a perceptable wobble until
I installed an outer pully to run the supercharger about 10000 kms ago.  The
car now has (77000 kms, 48000 miles).  I disassemlbed the unit and
reassembled it to make sure the installation was not faulty, and still the
wobble.  The outer crank pully is of a very high quality, low weight
aluminum and precisely concentric.

Am I to worry?  I've driven the car for 10000 kms with 50% more horsepower
and no change is evident. Should I attempt to torque the crank bolt to the
80-87lbs to make sure the bolt won't break?  I'm sure if my crank breaks,
Mazda will attribute it to the supercharger (but I'm off warranty anyway).
Or should I replace the bolt for preventative maintenance?



Drive Careful Fast ...

Sean N. Archer                  P.O. Box 61143
President,                      Kensington Postal Station
CDN Rockies Chapter             Calgary, Alberta
Miata Club of America           Canada T2N-4S6

1990 Mariner Blue Sebring Supercharged MX-5 Miata "MAX" (short for Maximum
Headroom)
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