Failure Analysis of a 1990 Mazda Miata Crankshaft and Timing Pulley Bolt
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A Mazda Miata crankshaft and timing belt pulley bolt failed in service. This caused extensive damage to the engine. The crankshaft and bolt were analyzed to determine the cause of failure. Using visual examination and other means, it was determined that the crankshaft and bolt failed by fatigue. The crankshaft failure initiated at the keyway, while the timing belt pulley bolt initiated in the threads. Inadequate clamping force during installation of the timing belt pulley bolt is thought to have initiated failure.
KeywordsCasting SEM Shafts Torsion Energy dispersive spectroscopy Failure analysis Fatigue failure
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