On all 90s and the early 91 cars Mazda used a crankshaft that had a narrow
cranksnout which is susceptable to cracking if the crank pulley nut is not
torqued exactly right.
Unfortunately this is a common occurance and usually is evident by the car
running poorly for unexplained reasons. In mid 91 and later cars they used a
thicker, shorter cranksnout which solved the problem.
The cheapest way to remedy the problem is to replace the motor in its
entirety rather than to buy a new crank. Although a 1.8 motor fits it
requires extensive modifications to the wiring and other items to get it to
work. The heads are not interchangeable between the 2.
BTW, the Miata battery would be great in a Roadster and they last a long
time!!!!!!
Mike
----- Original Message -----
From: "snyler" <marc@animalfirm.com>
To: "Roadster list" <datsun-roadsters@autox.team.net>
Sent: Tuesday, March 13, 2001 7:15 PM
Subject: <OT> Miata Meltdown
> My brother related a death in the family today, their 1990 Miata Is
> getting a new motor. Apparently the timing pulley spun on the crankshaft
> enough that it runs, but terribly. Is this common? is it fatal?
>
> Roadster content: who has used smaller batteries in the 1600s? How has
> it worked for you?
>
> -Marc T
>
> ==========================================================================
> Marc Tyler
> TDROC
> 1970 1600 #SPL311-31016
> 1965 L-320 #L320 013642 (the misspent ute)
> 1965 L-320 (Still in CA)
> http://datsun_marc.tripod.com/cgi-bin/Datsun_homepage.html
> Sisterdale TX
|