What? File Bearing Inserts?

Dick L

Well-known Member
For those that are not familiar with filing bearings for fitting bearings on a rod that takes shims. In the picture of the rod that I just picked off my junk pile you will see that with the shims removed and the bearing half ends pressing each other that you have a space where the shims were needed to torque the rod caps to spec. You can also see how the cap bearing half extends past the cap on both sides. Saying the crankshaft has worn to the point that no shims are needed to get the .002 clearance and you torque the cap with the bearing as it is it will have to go somewhere. It can not go out so the only place it can go is in toward the crankshaft. When this happens the crankshaft will not turn by hand.

I only take the time to post this beacuse as helpful and well meaning as some peoples opinions are, bad information only causes confusion to those working on this type of engine.
AllisCRod-vi.jpg
 
Not filing insert bearing shells refers to the non-shimmed type of connecting rod referred to in the previous post. Modern engines do not have shims and will have a slight protrusion of the bearing shell beyond the cap or rod; this is designed by the engineers to force the bearing into the rod/cap combination snugly so the insert cannot move while in service.
I agree that with a shim-type bearing some filing may be needed.
This is an example where there needs to be more information about the style of machinery & parts before suggested remedies are offered. Myself included!
 

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