The crank pulley bolt is the tightest fastener you will meet on a Miata, and its torque depends on which crank snout you have. Get the year right or you will either under-torque a strong snout or strip a weak one.
Short-nose vs big-nose. The short-nose crank is the early 1.8 (1994 to mid-1995). It has a smaller, weaker snout and is notorious for the keyway wallowing out if the pulley works loose
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