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Tractor Pulling Discussion Forum

Need Torque Values on 49' G.

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Miller49G

01-19-2006 00:51:12




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What is the proper torque for the main bearings on a John Deere G 1949? Can"t find it in the I&T manual any were at all. All it said was vary the number of shims to obtain not less than .002 and not more than .006 clearance on the main bearings. Also just want to check to make shore the head studs torque is 208 ft.-lbs. and the connecting rods are 62.5 ft.-lbs. Also what is the proper torque for the block to the main case and rear axle housing to the main case I"m getting ready to start putting my John Deere G back together?

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Miller49G

01-19-2006 11:32:55




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 Re: Need Torque Values on 49' G. in reply to Miller49G, 01-19-2006 00:51:12  
Thanks guys for the input. I just wanted to make shore every thing was going to be torqued right.



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G/MAN

01-19-2006 07:34:58




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 Re: Need Torque Values on 49' G. in reply to Miller49G, 01-19-2006 00:51:12  
I don't believe Deere made an actual "service manual" for the "G", so I&T specs may be all you can get. In situations where you can't find a specific spec, you'll likely have to resort to using standard specs for the size of fastener you're dealing with and the thread pitch. For instance, I think those bolts or studs holding the rear-axle housing to the main case are 5/8", so you're going to be looking at around 150 lb.-ft. And you may not be able to get a socket on all of them, so if you use a crow's foot or adapter, you'll have to adjust your torque reading accordingly. Myself, I'd just use some blue Loctite and get them good and tight. You also want to be careful swapping shims around on main-bearing housings, as you can end up getting the bearing out of round if you go looking for a specified clearance. Usually, you install the new bearing halves and shim for a certain diameter, and then have the bearing bored out to the proper clearance for the main journal. JD used to sell rebuilt main-bearing housings that way, as a matter of fact. Using plastigauge is pretty impractical, as you'll have to have the main bearing and crankshaft immobile while you assemble it all with both removed from the main case. You're better off using a telescoping gauge and micrometer to get an inside diameter reading from the main bearing, and an outside diameter from the crank journal, and derive your clearance from that. But based on the engine speed and how much it will probably be used, if the bearings and journals look good, I wouldn't worry much about an extra thousandth of clearance or two.

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Trkr

01-19-2006 07:19:23




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 Re: Need Torque Values on 49' G. in reply to Miller49G, 01-19-2006 00:51:12  
I imagine you would use plasti guage and get the clearences stated.



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buickanddeere

01-19-2006 02:53:44




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 Re: Need Torque Values on 49' G. in reply to Miller49G, 01-19-2006 00:51:12  
1-800-522-7448
All an IT manual is good for is holding the door open or as a paper weight.



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luckydog

01-19-2006 09:24:57




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 Re: Need Torque Values on 49' G. in reply to buickanddeere, 01-19-2006 02:53:44  
I some what agree with your statement on I&T mans. but I do not agree that they are only good for door jams. They are not as good as teck. mans. but I have several of the I&T mans and find them quite usefull. Not for a novice but a person that has a working knowledge!! luckydog



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