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John Deere Tractors Discussion Forum
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Early H John Deere flywheel size..

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BN in MN

07-26-2003 21:33:30




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Hi, I have a question. I have a 1939 H s/n 2992. My problem was that the flywheel was "wobbling" real bad. I tried to push it in all the way and tighten the 2 bolts. The flywheel would work it's way out after running after a little while. Today I put on a different flywheel, the part numbers matched B227R. But the flywheel I put on today was 1" bigger in diameter and it is also 1/2" thicker. I've purchased a flywheel wrench but I have not recieved it yet. I tightened the bolt the best I could with an socket and ran the tractor for about 15 minutes and it seems not to be wobbling as bad as the smaller flywheel did. My question is were the earlier H's supplied with a 16" x 2 1/4" flywheel and later did John Deere change the flywheel to 17" x 2 3/4"? When did JD do this? Would my H be original with the smaller or larger flywheel? Is there anything else that I can do to remove the crankshaft endplay? Any help would be greatly appreciated.
Thanks.. BN in MN

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BN from MN

07-28-2003 14:36:10




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 Re: Early H John Deere flywheel size.. in reply to BN in MN, 07-26-2003 21:33:30  
Thanks guys. As soon as I get my wrench I'll be set to go. I think I'll leave the bigger flywheel on for awhile. Sorry for the typo.. Thanks again!!!
BN from MN



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Clooney -fly wheel size

07-27-2003 17:25:29




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 Re: Early H John Deere flywheel size.. in reply to BN in MN, 07-26-2003 21:33:30  
BN, I finally got around to measuring the flywheel widths. the 39 is 2.4" wide & the 40 up is 2.760" wide. That will probably vary a little between casting runs though.



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Mike M

07-27-2003 15:43:46




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 Re: Early H John Deere flywheel size.. in reply to BN in MN, 07-26-2003 21:33:30  
You better double check that casting #B227R unless you did a typo that B prefix would indicate
a B tractor. I don't have my parts book handy but it should start with a H prefix. Also in setting the end play on an H flywheel there are two relief cuts in outside of flywheel in the slits wide enough to get a big screwdriver or a small rolling wedge bar into the groove cut into crankshaft so you can pry and pull the crank into the flywheel more to set end play.

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Clooney

07-27-2003 17:33:16




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 Re: Re: Early H John Deere flywheel size.. in reply to Mike M, 07-27-2003 15:43:46  
Mike, that is an H-227R. I knew what he was talking about so no need to correct it.
~You have a good point on that crankshaft slot, I have used that method a few times & if careful it will work good. Thanks, I forgot about those shallow slots. That should save him some work...



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Clooney

07-27-2003 06:15:42




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 Re: Early H John Deere flywheel size.. in reply to BN in MN, 07-26-2003 21:33:30  
BN, the 39 "H" did use a slightly narrower flywheel. The 40 & up used the wider flywheel. When Deere changed the flywheel design they kept the same casting number & the parts book shows the same flywheel on all as the later flywheel was the service replacement flywheel for the 39.... I don't have the sizes handy but if I think of it later I will measure them for you & post back [I have both early & late flywheels out back]. Most people don't even notice the size difference but once you know what to look for that flywheel difference can be seen form quite a distance & is a good way to identify an early "H". From the rear you can use the shifter height difference as a 39 identifier. The 39 "H" also used a shorter muffler as well as 3 instead of 4 bolt cam bearing cover. You will also find a slight difference on the inside lip on the front wheel window lips even though the wheels look identical.
~A lot of the early H's have the later wider flywheel installed as it was the service replacement & the engine idles better with the bigger flywheel.
~On the crankshaft end play? That isn't easy to set on the "H" as there is no easy way to hold the crankshaft over to the left. You can either pull the R/H main bearing housing, or pull the crankcase cover to hold [push on] the crankshaft. ~To set the crank end play to the desired .005"-.010" you need to loosen the flywheel pinch bolts, then hold the crankshaft towards the flywheel side as far as possible, then push the flywheel on until it is on as far as it will go, then quit holding the crankshaft over to the L/H side, then use a hammer & block of wood or a brass drift & give the crankshaft a light rap in the center of the flywheel to push it back through the flywheel S-L-I-G-H-T-L-Y. You want .005"-.010" of crank/flywheel lateral movement when the end play is set properly. That is a very light thunk when the flywheel is moved in & out by hand. If you have a clunk or can feel much movement you have too much end play.

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