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41B Crankshaft Movement

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MattG in WI

04-10-2003 09:39:44




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I am about 75% redone rebuliding my B. I have put the hand starting flywheel on, and put the clutch on and back together. I have noticed though that the crankshaft can move about 1/8 sideways. Do I need to move the flywheel in so that it is closer to the tractor and the crankshaft cannot move side to side? With the movement, when I engage the clutch the clutch pully actually slides out then engages. It does not have the "snap" like it should. Sorry for my lack of technical terms. I have not yet started the tractor. I did not take the crankshaft out of the tractor, but I did re-do the pistons as the cylnders needed reboring. The crankshaft was measured and it was withing specs.

Thanks.
Matt

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Clooney

04-10-2003 11:17:20




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 Re: 41B Crankshaft Movement in reply to MattG in WI, 04-10-2003 09:39:44  
Matt, .125" is an awful lot of crankshaft endplay for that "B". The spec is .005"-.010".
~Pull the clutch cover off & wedge a small jack of piece of wood between the R/H end of the crankshaft & the rear tire [or have someone hold the crank over with a big weight or block of wood. Make sure the crankshaft is over to the left [flywheel side] as far as it will go, then slide or drive the flywheel on as far as it will go [that should give you 0 end play], then remove the block or jack & give the crankshaft [flywheel side] a little swat to slightly drive the crank back in through the flywheel a little [don�t hit it too hard unless you need to]. Then lightly tighten the flywheel bolts, then grab the flywheel & move it in & out as hard as you can. If you get just the lightest of movements with a light tunk it is probably close, if you feel much movement, or the noise in more like a clunk it is probably too loose. If you have a dial indicator clamp it on the block & zero the pointer on the flywheel rim then the move the flywheel within it's movement, you need .005"-.010" to be correct. Once set, tighten the flywheel bolts & re-check�����.

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John T

04-10-2003 09:59:23




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 Re: 41B Crankshaft Movement in reply to MattG in WI, 04-10-2003 09:39:44  
Matt, it indeed sounds like you dont have the crankshaft in far enough yet and it needs to be moved in closer until theres hardly any side to side play. I dont have the actual spec, but it moves in to within something like 0.010 clearance. We usually take it in until we get no side to side free play. We do it by having one guy hold a sledge tight against the big bolt on the clutch end center as the other guy brings the flywheel home to her milk. CAUTION did you install BOTH the clutch drive disk AND the flywheel in time on their correct crankshaft splines????? They have V marks and/or dots indicating what spline they go on. If they are not in time, you will get a serious vibration problem plus it may be difficult to get the ignition timing correct. ANOTHER CAUTION the inside of the flywheel down near the crank should have a tiny tip protuding and it has to be where it fits and goes into the lil notch which turns the oil slinger inside that D shaped seal/bearing housing behind the flywheel.

Good Luck n God Bless the USA

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MattG in WI

04-10-2003 10:23:49




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 Re: Re: 41B Crankshaft Movement in reply to John T, 04-10-2003 09:59:23  
I did line up the flywheel and clutch with the timing marks. My driving disk does not have the V's it has a rivet on one spline that needs to go on a certain way. I figured that one out the hardway. So you are saying the Flywheel should be about 0.010 away from the side of the tractor? I do have little tip going into the notch, but it is just barely started. I will try moving the flywheel in closer to the tractor to see if that causes the side to side motion to stop.

Thanks.
Matt

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