New rod for dc today

jon f mn

Well-known Member
Had a knock in my dc motor for a while. This spring i took some shims out of the rods and it was better, but the front one was still loose with no shims. So I finally got a rod to replace it with. I was surprised how much worse it got with just a few hours of use. I doubt if I put 5 hours on it since I took the shims out. Putting it back together is this evening's project.
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Yes, that bearing was in the process of welding itself to the crankshaft, and it'll do it again. You might as well start splitting the tractor now, that crank has to come out.
 
Hey Jon do you feel like me. If it weren t for bad luck I d have no luck at all. I feel that way to often. RB
 
The rod in the picture with 5 hours since install,did you ever feel the engine start to tighten up? Maybe you were not the operator for all of the 5 hours.
 
No, never noticed it get tight. The babbit had an air pocket in it and I think that is what started it. I hope so anyway.
 
Jon, These old slow running engines are very forgiving about a lot of things.
I have switched rods around from one engine to another when needed. I have done a bunch of rod work on LA Cases. The secret is to get about one half of the bearing almost tight on the rod. I do that by shims and getting at least half a shiny bearing surface when rotating it back and forth on the crank.
I have poured quite a few bearings for Model Ts also.
Nice thing about the old LAs and Ds is being able to check them through the hand holes after running them for a while.
Good luck and let us know how it turns out.
Richard in NW SC
 

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