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John Deere Tractors Discussion Forum
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Re: 730 D crankshaft

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Author  [Modern View]

04-09-2013 06:47:52

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I'd never put one of these two cylinders together without AT LEAST .004 clearance. I don't recall the exact numbers from the book but I'm positive they don't call out .002 (at least not for 80's, 820's, 830's, 840's) These things aren't Swiss watches and they need some extra room.

The allowance for out of round on the crank journals is .001. I'm almost certain the main bearing clearance "shoot for" numbers are .004 to .006 and I'll assure you that you are better off shooting for the high side.
If you crank is clean and round just measure it and have Manitowoc make you bearings with a hole about .005 + over your measurement. If the 730's have a center main (99% sure they do) better check it for ovality. Pull the center bearing halves out and torque the cap back on. Then measure at several places. Odds are pretty good you'll have some ovality. You need to take this into consideration when sizing the center mains. There's stuff you can do to compensate for this. If you have issue and want to discuss let me know. I'm not an expert by any means but I've been there and done that...

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Scott 730

04-09-2013 15:29:39

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 Re: 730 D crankshaft in reply to Rwolfejr, 04-09-2013 06:47:52  
My mistake. I was looking at cam clearance instead of crank. :? Crank clearances.
Right and left mains .006-.008
Center main .0021-.0055

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