I believe Chas is correct and yes, this can be done with the engine still in
the car. If and when you do this, make sure that the shaped end of the 'key'
goes in first and that the shape of the 'key' matches pretty well with the
shape of the slot. I also think part of the problem is that the key is
simply too short which may allow it to migrate all the way to one end of the
slot where it's more likely to get itself into trouble. A simple bit of
liquid steel in the outer portion of the slot will work as a shim / spacer,
to keep that key from wandering later.

Is the mileage near timing belt time, cause the work greatly overlaps and
could be done together.

Good luck,
Chris
99BBB

"Chas Hurst" > wrote in message
...
>
> > wrote in message
> ups.com...
>>I recently purchased a super low mileage 1990 miata with short crank.
>> It's really beautiful and looks like new. I'd like to have the skinny
>> crank installed for a personal feeling of security when I'm driving
>> through the desert at night. At his point I don't have a handle on the
>> possible cost of the replacement.
>>
>> Can it be installed without pulling the engine? Does anyone know
>> whether it's the kind of job a local import shop could do or should I
>> go to the mazda dealer?
>>
>> Thanks for your help.
>>
>> Ralph
>
> In theory it could be done. In practice it would be much easier to remove
> the engine. It is a task that should be done by a very experienced shop,
> which may exclude your local dealer.
> But, I b'lieve all that really need be done is to replace the bolt holding
> the pulley to the crankshaft with the upgraded bolt and properly tighten
> it, using thread locker.
>