Posted by FarmallCT on January 03, 2017 at 11:28:54 from (69.113.240.233):
Hi Everyone,
As some of you may remember from posts awhile back, I have a 1938 Farmall F-20 I bought that spun the rod bearings. Over the past few weeks I have been cleaning up the crankshaft and working on properly shimming the rod caps. The crankshaft is clean now and has been properly sanded and is smooth. I got all the shims to where I think is about right, and this last time going through checking I did plastiguage it to make sure they are at least somewhat near the proper clearance. If I remember correctly 3 of them are around .005-.006 and one is around .004 which I think is pretty good.
My problem right now is when I torque down the nuts, I get them to about 45-50 lbs (according to a post from a few years ago is what most here people go by for torque) and some of the holes to put the cotter pins through don't line up.
In the past I was always told just tighten it to the next time the hole lines up which usually works without increasing torque too much. For some reason in that little amount of space to line it up, I am going from 45-50 lbs to 60-70ish pounds, if not a little more. This, to me, seems way too high of a torque to comfortably leave it at, especially since the original problem was spun bearings, and the cause of which is still unknown.
My question is pretty much what do I do in this situation? Is it okay for the torque to be that much higher as long as I still have the clearance between the bearings and the crankshaft? Right now I can move 3 of them back and forth just fine on the crankshaft so I know there is enough space that they are still moving freely. The only one that I cant shift forward/back a little is #4 which was the worst one when it spun and it has a clearance of .006 ish on the plastiguage. I can still turn the engine over by had just fine with them all torqued down.
So what would you guys do/have you done on these older tractors in this situation? And is it okay that they shift back and forth easily or that the #4 doesn't but still turns fine? (I would assume its fine since it means they aren't too tight on the crank and they aren't too loose). My apologies for the long winded explanation and questions, just trying to figure out everything I need to get this wrapped up without having to tear into it again due to not torquing it right.
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