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41 B john deere

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Jim Bob

01-02-2003 15:32:19




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Ok here it goes. I have a (41) B that I suspected that the cam shaft gear is off time with the cam. When I tried to time the mag I couldn't. The dots on the cam shaft and the governer gear does not match. When I rotate the fly wheel to LH impulse the dot is at the top on the cam gear BUT the LH cylinder is going into intake stroke not power stroke. When I rotate the fly wheel to compression stoke and LH impulse there is no dot. Clear as mudd!! It seems to me that it is half off. So a person cant time the governer gear with out the dot on top on compression stoke (TDC). Please Expain if I'm wrong. Does this even make a differance being that the governer shaft and mag has a slotted drive in that you just have to switch the plug wires just as long as the dots match on the cam and gov. gears? Boy am I confused!!

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Will P

01-02-2003 16:09:12




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 Re: 41 B john deere in reply to Jim Bob, 01-02-2003 15:32:19  
OK, Your statement of (When I rotate the fly wheel to LH impulse the dot is at the top on the cam gear BUT the LH cylinder is going into intake stroke not power stroke. ) That right there tells me that the flywheel is on wrong. Open up the crankcase. Put #1, left hand cylinder at top dead center. Make sure your flywheel is on right.
If it is take your valve cover off. Rotate your flywheel to "left hand exhaust open" Make sure that your exhaust valve starts opening right when you roll it past the mark. If ok, line the left hand impulse up. Set the mag slot to horizontal. If any more questions, just holler.

Will P

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Bob

01-03-2003 06:48:12




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 Re: Re: 41 B john deere in reply to Will P, 01-02-2003 16:09:12  
Will, the LH Impulse mark on the flywheel will be in approximately the same place on both the intake stroke and the power stroke. Two crankshaft revolutions to complete the full four cycles of operation.....



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Will P

01-03-2003 18:52:38




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 Re: Re: Re: 41 B john deere in reply to Bob, 01-03-2003 06:48:12  
When the LHI mark on the flywheel is lined up with the mark on the 5-6th gear cover. The piston should be all the way forward. Is it?

Will P



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Clooney

01-02-2003 16:05:42




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 Re: 41 B john deere in reply to Jim Bob, 01-02-2003 15:32:19  
Jim Bob, if it runs, the cam isn't 180° out of time. ~If you suspect the cam is out of time, set the L/H exhaust valve lash, then rotate the flywheel until the L/H exhaust valve is just starting to open [0 lash], if the cam is timed correctly the L/H exhaust mark on the flywheel will be within an inch or so of the case mark [at 3 o'clock on the case behind flywheel].
~Don't worry about that darn mark on the governor gear [it can be used but will be straight up & not lineup with the cam gear]..Just turn the flywheel until the L/H impulse is lined up with the case mark & at that time the governor drive flange for the mag should have the slots running fore & aft [parallel with the ground]. Or, when the slot in the flywheel is parallel with the ground, the slot in the governor drive flange is also parallel with the ground. It makes NO difference if the governor gear dot is up or down as long as the mag drive flange slot is parallel with the ground when the L/H impulse mark on the flywheel is lined up with the case mark... Make sure the flywheel is on the crankshaft correctly before using it to time anything.
~If the mag is a Wico C or X it can be installed either way & the wires swapped top to bottom until it runs. If you want to get it correct so the top wire fires the L/H spark plug you can turn the flywheel until the L/H cylinder is on compression & the L/H impulse on the flywheel lines up with the case mark, then insert a wire in the mag top tower & bend within 1/8" of the case then turn the mag drive cup until it sparks the top tower, then install the mag & set the impulse to trip at L/H impulse to case mark up. Or just install the mag & try it, if it fires the top tower for the L/H plug it is correct, if it fires the bottom tower then just pull the mag & give the drive cup a 1/2 turn & reinstall it.

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John T (Yo Clooney and Missouri Mike)

01-02-2003 16:18:54




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 Re: Re: 41 B john deere in reply to Clooney, 01-02-2003 16:05:42  
Hi Ya Clooney Man, As we know (looks like we answered this question at exact same time), if the Wico C or X mag is 180 out, you can swap the top and bottom plug wires to make her run. If its in corect, of course, that leading rotor tip fires the top plug and the lagging tip the bottome one. Soooo me and my old buddy Mike Aylward from Missouri (the stubborn show me state) have a running argument with me saying "electrically" it doesnt make any difference if its in backwards and you reverse the plugs to make her run, but Ol Mike insists they dont run as good in that situation??? Sooooo whats the official clooney opinion on that question????? I hope you get to the next gaTHERING OF TEH GREEN OR eXPO so we can swap a few lies. Ol John T

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Clooney

01-02-2003 16:52:57




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 Re: Re: Re: 41 B john deere in reply to John T (Yo Clooney and Missouri Mike), 01-02-2003 16:18:54  
John, I have to agree with you in theory. That mag fires every 180° so everything inside [except the rotor & points ] lines up the same to fire either cylinder. I suppose that Mike could have found a few over the years that do make a difference due to wear on the points cam or cap contacts that could have a slightly different timed or intensity spark going to the weaker R/H or stronger L/H cylinder. But then the same could be said that some could run better with the mag reversed. I haven't ever seen any difference either way, but usually install the mag with the top wire to the left so all my tractors are the same as production.

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John T

01-02-2003 16:00:56




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 Re: 41 B john deere in reply to Jim Bob, 01-02-2003 15:32:19  
Being an old fan of the Waltons TV show, I like that Jim Bob name. OK, the cam, of course, has to be timed to the crank so the valves open and close according to where the piston is. Then, since the governor drives the mag or delco distributor, it has to be in time with the cam gear. When left piston is at TDC on its compression stroke (ready to fire), thats when the flywheel LH impulse is at 3 o Clock in line with the mark on the side of the tractor. Also at that same time to time the mag, the governors gear must be timed so that the female drive cog slot is HORIZONTAL. It doesnt matter which horizontal it is, it could be 180 either way and still work. Its the cam that has to be in time with the crank for proper valve timing, and then so long as at TDC on left power stroke (LH Impulse at 3 O Clock) the cam/crank timing is ok, so all you have to do is get the governors shaft in time with the cam gear so the slot is then horizontal. Is this clear as mud ??? lol Are you sure the dot you're referring to isnt for the cam to crank gear timing and nothing to do with the cam to governor??? That cog slot in the end of the governor is gonna be horizontal at both piston TDC's compression and exhaust. The mag (most Wicoss at least) fires at TDC on both power and exhaust remember. Its when you get the mag in 180 out that you can reverse the top and bottom plug wires to make her run. Hope this has helped and NOT added to the confusion. Ol John T Nordhoff in Indiana

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