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Timing a D Question

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John T

02-02-2006 19:31:24

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Okay gang, as yall may know Im just NOT a D man, I dont even like the heavy bulky things. I wanna ask about timing the ones that INSTEAD of the Left Hand Impulse flywheel timing mark at 3 o clock, some have markings something like Left Spark or Left Advance or somethign different PLUS its in a different angle location on the flywheel. My guess is that concerns the type of mags (Dixie or Edison or Splitdorf??) that have that adjustable manual spark advance where one sets it at retard to start then manually sets it up for advance after shes running.

Please talk to me about what D's or what mags etc have that different flywheel timing mark etc. Is it you manually set the mag to retard and then do its start timing so it snaps at that Spark or Advance mark on those D flywheels?????

John T

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Mike M

02-03-2006 06:06:52

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Re: Timing a D Question in reply to John T, 02-02-2006 19:31:24

I'm haven't worked on many D's either.

I read through Glen's post and for some reason it doesn't match up to what I remember when I timed a 1927 D with a solid keyed flywheel ? I seem to remember that when at #1 TDC my mark on the fylwheel was even with the top of the tranny case not like the 3 o'clock I have always encountered on other Deere's. So I think I just observed the piston position to make sure it was at TDC or a hair after when the spark occured.

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Glen in TX

02-03-2006 08:38:27

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Re: Timing a D Question in reply to Mike M, 02-03-2006 06:06:52

Mike, The one you did probably had the governor shaft off time or the camshaft out of time some. Also the mag drive pieces having severe wear in them make for one hard to start D. The early Ds had a sheet metal cover on the LH trans spline bearing with a mark or arrow to align with at about the 3 o'clock position. If you want the info from D manual later email me. I've had the early and late D flywheels sitting side by side before and there is a bit of difference in where the marks are at on flywheel. Most D parts books show you 4 different flywheels and crankshafts used on the Ds but there were more flywheels used because of the spoker and nickel hole types. Early Wico mag manuals tell you to set the impulse up at 37 degrees for the Ds with later Wico conversion but later they changed it to 35 degrees.

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Mike M

02-03-2006 09:42:01

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Re: Timing a D Question in reply to Glen in TX, 02-03-2006 08:38:27

I don't have that tractor anymore. It was along time ago I got it running. I think it may of had a newer style replacement Fairbanks Mag. on it. I don't remember the exact details except I do know that something was screwy and I just set it to fire by piston position and kinda ignored those marks because they seemed way off.My marks must of been for an advanced setting ? for an old mag. It did actually start pretty good. It also had a screwy spring loaded choke shaft and I had a wire made up to hold it closed for starting.

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Glen in TX

02-03-2006 11:51:30

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Re: Timing a D Question in reply to Mike M, 02-03-2006 09:42:01

Yeah, sometimes it just takes patience to time those old Ds. We had a 28 with governor worn real bad and finally rebuilt one off a 30 model and it had the later FM-J2 mag on it too and took some tinkering to get it timed right. Finally ended up putting a new impulse & dist. disc on the mag because it was worn throwing things off. Then it would fire right on that timing mark and start with just a few pulls.

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Glen in TX

02-02-2006 20:25:21

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Re: Timing a D Question in reply to John T, 02-02-2006 19:31:24

On Ds 30400-109943, 24-30 year, you will find the mark "L H Retard Spark" on flywheel. On Ds 109944 and up, 31-53 you will find the mark "L H Impulse" on flyweel. You have 3 different sets of instructions for timing Ds because of early ones with base mount mag with variable spark, base mount w/o variable spark, and later flange mount mag. Yes, you want them all to have LH cylinder spark on TDC LH compression when the marks on flywheel and cover align at 3 o'clock position.

D 30400-109943 with variable spark mag:

On early Ds you have to understand with the base mount mag there is a variable adjusting metal drive disk clamped with two bolts on the governor to mag drive. You loosen those bolts to loosen the disk allowing mag and engine to turn independent of each other when mounting and timing a mag. After that is loose go ahead and mount the mag and then turn engine to where LH Retard Spark mark on flywheel aligns with mark on tractor at 3 o'clock mark and LH cylinder on compression stroke. Leave engine there and now that engine and mag can turn independent of each other you remove the dist cap. Then on one with the Dixie-Aero or Splitdorf mag set spark lever clear back, fully retarded. Then turn mag same direction flywheel runs to where brass segment of dist. disc it in upper right hand corner and breaker points just beginning to open. Then tighten screws on variable drive flange disk. On those mag the forward terminal on cap goes to LH cylinder and rear terminal goes to RH cylinder. John, I can email you the other instructions easier later. Seems like I posted all this one here before too? lol.

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Glen in TX

02-02-2006 21:56:33

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Re: Timing a D Question in reply to Glen in TX, 02-02-2006 20:25:21

Before you time as above, first be sure points on those older mags are set at .020"

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John T

02-03-2006 06:54:52

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Re: Timing a D Question in reply to Glen in TX, 02-02-2006 21:56:33

Thanks Glen, As always your answers go "above and beyond" the call of duty. Im gonna save this for future reference.

John T

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