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adjusting the F-20 rod bearing

S

SDE

Well-known Member
I made a shaft that is .003 larger than the crankshaft journals. I put the connecting rod in a vise and then removed shims until the shaft was tight in the bearing. I then turned the shaft with a pipe wrench. After removing the shaft, I would scrape the bearing. I did this until the shaft showed that it was making contact on at least half the bearing surface. Some had two more shims on one side than the other. I put them back so that each side had the same amount. This is my first time working with babbit bearings. Am I doing it OK so far? I saw in the archives that you install them onto the crank so that they are tight and then add a shim to each side until they are loose. Will the way I did it work OK?.
Thank you
Steve
 
I would much rather see you adjust the bearings to fit the actual crankshaft journal. Here is what I have done in the past on F20/Regular engines. With the piston/rod assemblies out of the engine, I take one by one and fit them to the crankshaft until I have found that with X number of shims on each side the crankshaft will not turn but with X+1 shims on each side of the rod the crankshaft will turn freely. Follow this procedure with each rod bearing in turn, once this is done, THEN install the pistons/rods into the engine and bolt them to the crankshaft. I have followed this procedure on two Regular engines that I have rebuilt and have found it to work the best.
 
SDE, your way might work if every journal on the crank was exactly the same, but the method Nebraska Kirk describes is preferred for variances in rods and cranks.
 
I will definitely do it as you gentlemen have discribed. I think the crank has been ground, but it has sat for so long that they are not shiny or bright any more.
thank you
Steve
 
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