Re: More crank bearings

Posted by riverbend on January 11, 2005 at 19:37:02 from (208.160.33.179):

In Reply to: More crank bearings posted by CNKS on January 11, 2005 at 18:19:12:

How about one more opinion ? It ran with the worn bearings. It will run fine with new bearings, and it will have better oil pressure.

I foolishly thought that I had mis-measured the journals on my H when I rebuilt it. They were only a thou or so undersized.... When I checked it with the new, standard shells, the clearance was 0.004". Pretty disappointing.

I bought a roll of 0.001" copper shim stock from McMaster Carr and shimmed up both sides of the mains and rods. It measured 0.002" all the way across.

When I took it apart, only the lower shell had been shimmed. I know, but I thought that somebody had shimmed up worn shells. It ran like that for 10 years. On the transplanter, it had to run so slow that it would stall out. Other times when the disk went deep in the sand coming up a hill, it lugged down until it died. I took it apart because the valves were shot.

The tractor worked fine this summer. I am a little more careful not to lug it so much anymore. It still has to run at idle to pull the transplanter, but now it makes more power and does it easily. The oil pressure reads half a gauge, hot, at idle with 10W40.

If the journals are smooth, I would not worry about reusing the crank as is. I never had the crank reground on my Norton and it will touch 7000 rpm. It has gone 35,000 miles so far, and if it breaks (knock on wood), I could be 1500 miles from home.

If you need some thin shim stock, let me know, I must have enough to do 5 engines. Be careful when you trim around the oil holes. It worked better to put the shim stock on cap or the block rather than on the back of the bearing.

Greg

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