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Tractor Pulling Discussion Forum

Crankshaft for John Deere G

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TMT Puller

03-06-2006 15:03:41

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How much can I stroke the crank of a 1947 G without having to modify the transmission case cover? I have heard some people say they have to modify the cover with a bell curve in it so the crankshaft can clear it safely. Any input would be appreciated.

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jd b puller

03-08-2006 17:38:18

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Re: Crankshaft for John Deere G in reply to TMT Puller, 03-06-2006 15:03:41

TMT, that's a good question. Depends on your rods. For example, stock stroke on a B is 5.5 and you can stuff a 7" crank in there with the right rods and not even get into the rear case, much less go thru it.

Talk to your guy you are going to use to stroke the crank. If he can't recommend a good rod/stroke combo, talk to someone else. If you're trying to minimize work, and maximize clearance, I'd say A,B,G rods are out of the question. Look for a "hook" type rod, rather than the straight on rod in a 2 cyl Deere.

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jd b puller

03-08-2006 17:39:07

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Re: Crankshaft for John Deere G in reply to TMT Puller, 03-06-2006 15:03:41

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JDGnut

03-06-2006 20:59:35

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Re: Crankshaft for John Deere G in reply to TMT Puller, 03-06-2006 15:03:41

8.375 it about max.. depending on what rods you want to use.. You can probably get 8.5 if you change the studs in the rods.. or cut the nuts down... but you will have to notch the top of the case.. and the cam... Using A Rods... JDGnut

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jdlover

03-06-2006 15:45:41

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Re: Crankshaft for John Deere G in reply to TMT Puller, 03-06-2006 15:03:41

not much;maybe 5/8 or a little more on a g.I know 5/8 on an A is about max without cutting out the cover.

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