This is a longshot:
For whatever reason the crank sleeve on the front of the engine is not exerting enough pressure onto the fromt of the timing gear. This is usually caused by a NOT properly torqued crank bolt or the crank snout protruding beyond the dampner.
For whatever reason the crank sleeve on the front of the engine is not exerting enough pressure onto the fromt of the timing gear. This is usually caused by a NOT properly torqued crank bolt or the crank snout protruding beyond the dampner.