[Miata] Amount of wobble for 1990 shortnose?

[Keith Tanner]

You're not looking at the crank. You're looking at the harmonic
damper, which has a much higher failure rate than the crank does as
time goes on.

Step 1: check the alignment of the timing marks. Pull the #1 spark
plug, drop your dipstick down the hole and rotate the engine (21mm
socket on the crank bolt) until it's at TDC. You'll know you're there
when the dipstick stops moving up and is about to start moving down.
Now, is your timing mark lined up with the T?

Bad dampers tend to have the timing mark rotated.

Keith

On Wed, May 7, 2008 at 5:05 AM, Larry Alster <Larry at miata.net> wrote:
> Agreed, if you can see it it's too much and you need to deal with it while
>  you still have a chance of saving the crank.
>
>
>
>  Larry
>
>  White Knight      1991 Crystal White   #99 CSP
>  Silver Bullet        1992 Silverstone     #17 SM2  FM I+ Turbo
>  Honey B             1992 Sunburst Yellow #99 SM2L  JR Supercharger
>  Whooosh           2004 Titanium Mazdaspeed MX-5
>
>  LowCountry Miata  http://www.lowcountrymiataclub.net
>  Masters Miata
>  RAGS 074
>
>
>
>
>  -----Original Message-----
>  From: miata-bounces at realbig.com [mailto:miata-bounces at realbig.com] On Behalf
>  Of Ken Bogart
>  Sent: Wednesday, May 07, 2008 6:41 AM
>  To: David Ralph
>  Cc: miata at realbig.com
>  Subject: Re: [Miata] Amount of wobble for 1990 shortnose?
>
>  That sounds like a lot of wobble to me. If you can see it, it sounds like a
>  lot.
>
>  Have you had the timing belt done? When it was last done, who did it
>  and did they know the proper procedure?
>
>  I would disassemble and inspect, replacing the key and crank bolt.
>  Possible crank repair.
>
>  KEN
>
>
>
>  On Wed, May 7, 2008 at 12:21 AM, David Ralph <dralph at stny.rr.com> wrote:
>  > I must have springtime paranoia or something.
>  >
>  > When eyeballing the harmonic balancer and other pulleys on my early
>  > 1990, the crank pulley has something like 1/8" wobble at the lip,
>  > while all of the other pulleys seem to be dead perfect.
>  >
>  > Should I be doing something or just continuing to watch?
>  >
>  > 72,000 miles on the clock.
>  >
>  > Thanks
>  > Dave Ralph
>  >
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