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John Deere Tractors Discussion Forum
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timing

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Jim 52G

05-07-2006 20:06:57




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I can't get my 45 A timed. with mag advanced all the way it still doesn't fire till flywheel impulse mark is about two inches above the cover timing mark. I check the gears on gov. and cam and it is aligned. I don't know if this is related but i do have alot fan play. do i need to start replacing bearings in the govenor? thanks for any help




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Jim 52G

05-08-2006 13:34:49




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 Re: timing in reply to Jim 52G, 05-07-2006 20:06:57  
the drive for the mag is not perfectly horizontal when the impulse mark is at 3oclock timing mark. not sure what mag it is doesn't look like any wico c or x I ever seen. the dots did match up cam and govenor gears. tractor would start fine but would backfire thru exhaust without a load. I had the head rebuilt. I'm going to have remove govenor because one weight is off. i haven't ran it since seeing the weight laying inside the govenor.

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Glen in TX

05-08-2006 22:23:14




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 Re: timing in reply to Jim 52G, 05-08-2006 13:34:49  
Starting to sound like a governor rebuild with bearings and other parts will be necessary first along with new weights and maybe a gear too. Then you can get the slot horizontal with LH cylinder at TDC when reinstalling governor. Maybe you got a Fairbanks Morse FM-J2A6 or FM-X2A6 mag or Edison Splitdorf CD mag or could even be a Edison Splitdorf RM-2 or a Bosch mag or one of the battery distributors that look like a mag too?

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Glen in TX

05-07-2006 22:03:23




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 Re: timing in reply to Jim 52G, 05-07-2006 20:06:57  
Retime and making sure the slots for drive are horizontal as said earlier. Tell us which mag you have and drive cup and where the mark is at in Wico mag for impulse. Witness mark on impulse stop on a Wico C or XH should be about 4 1/2 marks left of center for 25 degrees with 6274 drive cup only OR.. about 2 1/2 marks left of center with other drive cups for 25 degrees or about 4 1/2 marks for 35 degrees with other drive cups. If impulse parts are worn bad it won't be exactly there though either but shouldn't be 2 inches off on the flywheel marks.

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Pappy

05-07-2006 20:52:27




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 Re: timing in reply to Jim 52G, 05-07-2006 20:06:57  
Before you start tearing it down,check the magneto drive slots to see if they are exactly horizontal when the timing marks on the flywheel and cover are exactly aligned. If the slots that drive the magneto are not exactly horizontal, lift the governor and rotate it until they are.
Also, check the lag angle adjustment on the magneto to see if it is turned too far forward causing it to trip too late. Just a couple of things to check before you start buying parts. Hope this helps.

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Bob

05-07-2006 20:40:35




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 Re: timing in reply to Jim 52G, 05-07-2006 20:06:57  
I must not be "following" you, 'cause if the "LH impulse mark is 2" ABOVE the stationary mark when the impulse trips, your mag timing is TOO advanced.



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F-I-T

05-08-2006 04:53:07




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 Re: timing in reply to Bob, 05-07-2006 20:40:35  
Naw....if the timing mark on the flywheel went past the stationary dot and then the mag impulses, the mag tripped late which is retarded. That's what he is saying isn't? That he has the mag fully aft which is fully advanced and the mark is still late. Sounds like a tooth off to me.....

If the mag is rearward all the way and it is still tripping late, then the lag angle must be wrong. Here is what I do. If it is running, even though maybe not well, measure and mark the flywheel the 25* or whatever it is, clamp a timing light on #1, and set the running timing (if you can get it to the running setting) Then when you shut it down and check the timing static, and if the timing is not on the mark, your lag angle is wrong. If you can't get the running timing to set correctly, you probably are off a tooth.

Frank

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Bob

05-08-2006 06:35:43




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 Re: timing in reply to F-I-T, 05-08-2006 04:53:07  
I'm surprised I didn't get a butt-checwing over this one, not stopping to think where the stationary mark is located....

Oh, well, it's the start of another week!



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