04-16-2022, 02:09 PM
Not supposed to be any end play on a 45, both bearings are supposed to be press fit on the shaft and in the bearing bore.
That being said, some guys like to have about 0.010" end play achieved by reducing the crank a few tenths where the inner race is normally pressed, this reduces the gyroscopic effect of the flywheel and is supposed to be easier on the crank and may increase performance a bit. This is done more on the 820 but I have done it on a few macs. It does shorten the life of the crank where there is slippage between the bearing inner race and the crank.
Bottom line is that McCulloch designed all it's engines to have zero end play. When things get too loose you end up with cracked and egg shaped bearing bores.
Just my two cents, the green high temp locktite retaining compound does work for awhile if the fits are not too loose.
That being said, some guys like to have about 0.010" end play achieved by reducing the crank a few tenths where the inner race is normally pressed, this reduces the gyroscopic effect of the flywheel and is supposed to be easier on the crank and may increase performance a bit. This is done more on the 820 but I have done it on a few macs. It does shorten the life of the crank where there is slippage between the bearing inner race and the crank.
Bottom line is that McCulloch designed all it's engines to have zero end play. When things get too loose you end up with cracked and egg shaped bearing bores.
Just my two cents, the green high temp locktite retaining compound does work for awhile if the fits are not too loose.