In the process of tightening the fan belt and some rotational freeplay (about +/-10 to 12 degrees) in the damper / big crankshaft end nut was observed - early BJ-7. There is little to no "lash" or thrust - back and forth movement, only this rotational movement. The nut is secure and damper pressed fit nicely to crankshaft with no leaking oil from seal. Also, there is no movement of the distributor that corresponds the degree of freeplay. Other than this, the engine runs smoothly through RPM range.
So the question: Is there an acceptable tolerance for crankshaft rotational freeplay? What's going on here with the engine?
So the question: Is there an acceptable tolerance for crankshaft rotational freeplay? What's going on here with the engine?