01-06-2019, 09:12 PM
My thoughts about the timing gears are that the crank is constantly changing length as it flexes with firing pulses etc and the plain ball or a.c at the front possibly dampens the impacts on timing gears.
My father bought his car in 1940 and although the motor had just been reconditoned something seemed wrong so he repeated much of the exercise.. He could not obtain a new rear bearing so fitted a ball. He reckoned it was unsatisfactory for some reason and replaced a few hundred miles later when he managed to obtain a roller. Despite umpteen dismantlings over the decades the front lip remains. Careful amateurs often do better than "mechanics".
My father bought his car in 1940 and although the motor had just been reconditoned something seemed wrong so he repeated much of the exercise.. He could not obtain a new rear bearing so fitted a ball. He reckoned it was unsatisfactory for some reason and replaced a few hundred miles later when he managed to obtain a roller. Despite umpteen dismantlings over the decades the front lip remains. Careful amateurs often do better than "mechanics".