06-02-2021, 12:19 PM
I am in the process of rebuilding a 1935 crankcased engine and am struggling with the Front Bearings. I know this is something that has been discussed many times, I've searched through the forum and all the relevant books but can't seem to find an answer. I would appreciate some help to see if I can get this engine project moving.
A bit of background:
The bearing housing is "full width" and has the original lip. New AC bearings (from a cherished supplier) have been fitted Thrust to Thrust, tight up against the Lip. The crank is tight up against the inner race of the bearing and the outer bearing protudes from the housing by 14 thou.
The timing gear has been fitted and the starter nut tightened up.
The Problem:
When all fitted the crank is stiff to turn around and there is zero end float.
I thought there was something wrong with the bearing setup so I removed them again. Put them together in a vice with sockets pushing the centre races together (as they would be when fitted). The outer races do not turn smoothly, they appear to be pressed together.
It feels like I am missing something but not sure what....
If I fit a makeshift shim in between the inner races (cut up coke can) and then put back in the vice, things are a lot smoother and I can "just" turn the outer bearings individually.
A great reference for the vice trick was:
http://www.da7c.co.uk/technical_torque_a...t%204.html
The thing that concerns me is that in all the reference material I have looked at I havent seen any reference to anyone having to fit shims in between bearings? Any advice greatly appreciated
Thanks
A bit of background:
The bearing housing is "full width" and has the original lip. New AC bearings (from a cherished supplier) have been fitted Thrust to Thrust, tight up against the Lip. The crank is tight up against the inner race of the bearing and the outer bearing protudes from the housing by 14 thou.
The timing gear has been fitted and the starter nut tightened up.
The Problem:
When all fitted the crank is stiff to turn around and there is zero end float.
I thought there was something wrong with the bearing setup so I removed them again. Put them together in a vice with sockets pushing the centre races together (as they would be when fitted). The outer races do not turn smoothly, they appear to be pressed together.
It feels like I am missing something but not sure what....
If I fit a makeshift shim in between the inner races (cut up coke can) and then put back in the vice, things are a lot smoother and I can "just" turn the outer bearings individually.
A great reference for the vice trick was:
http://www.da7c.co.uk/technical_torque_a...t%204.html
The thing that concerns me is that in all the reference material I have looked at I havent seen any reference to anyone having to fit shims in between bearings? Any advice greatly appreciated
Thanks