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37 B timing marks

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Rob in Mi

05-29-2007 06:40:15

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I am taking my B apart for restoration, and I found the timing marks on the gear on the end of the governor gear, but couldn"t find any on the gear off the cam. When I took the governor off I found the timing mark on the cam gear, but it isn"t close to the mark I made when I took the governor off. Is there any way possible the tractor ran fine with the timing marks off like that? The guy I got the tractor from said he ran it for many years and he finally got too disabled to start the tractor and parked it in a garage for 17 years until I got it out, he had his son in law turn it over all the time so it wouldn"t get stuck on him, but it didn"t have any compression when I dug it out of the garage. He said it was a really good running tractor!

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John T

05-29-2007 07:15:56

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Re: 37 B timing marks in reply to Rob in Mi, 05-29-2007 06:40:15

Rob, Assuming the Flywheel is on the correct crankshaft spline and the cam is timed correct to the crank, its possible to correcttly time the governor to the cam and it makes no difference if its 180 out from any cam and governor gear marks, if timed as follows:

When the Flywheels Left Hand Impulse Timing mark is in the 3 o clock position lined up with the flat mark on the tractors side (left piston ought to be at TDC then) time the governor gear down on the cam so its open female drive slot (where mag mates into) is flat horizontal fore n aft.

Once thats done, the Mags Lag Angle and Impulse Start Timing and run time advance can be set proper.

Check for stuck valves as far as that no compression problem, if any are stuck I would loosen n remove the rocker arm assembly so turning the flywheel n cam dont bend any pushrods. The rings may be carboned n stuck causing low compression, but even if so and the valves arent stuck, some oil squirted in the cylinders ought to give you at least some low compression.

A good crankcase n cylinder flush and fluid change sounds to be in order and insure no stuck valves before you proceed.

John T

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Swood

06-04-2007 08:35:43

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Re: 37 B timing marks in reply to John T, 05-29-2007 07:15:56

Hi, I am working on a 36 A and was wondering if it would time the same as the 37 B. Got it as a basket case so I didn't get to check any marks. Thanks

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Rob in MI

05-29-2007 14:23:54

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Re: 37 B timing marks in reply to John T, 05-29-2007 07:15:56

Hey John,

Thanks for the info. I have the tractor pretty much torn apart. When I bought the tractor I could turn the flywheel with no resistance what so ever, I did put oil in the spark plug holes, and for alittle while I did have some compression. One valve was stuck. Since then, I had new rings,valves,guides,springs,push rod tubes put in and I had the cylinders honed and the block cleaned.Yesterday I took the flywheel and governor off. I took off the cover by the flywheel on the governor and marked the gears, I couldn"t see the mark on the cam gear, I did find it when I turned the gear and it is about 1/4 turn past the marks I made. When I put it together should I retime everything or put it back the way it was? I suppose it would save alot of trouble just leaving it, as long as it will run. If you think I should retime everything, could you walk me through the steps?? Thank You Rob

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John T

05-29-2007 15:06:27

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Re: 37 B timing marks in reply to Rob in MI, 05-29-2007 14:23:54

I just wouldnt feel comfortable UNLESS when the flywheels Left Hand Impulse is at 3 o clock lined up with the flat mark the governor gears female drive slot (where mag mates) was flat horizontal fore n aft. Once thats the situation all the standard Mag timing procedures can be followed like they should be buttttt tt it can still run fine if that governor were off a few teeth cuz you can counteract that to a certain degree with the other mag rotational flange timing and impulse stop plate adjustments up to a certain point.

Mag timing isnt rocket science, myself or FIT or Duane or Glen and many other gents can guide you through that if needed.

Best wishes

John T

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Rob in MI

05-29-2007 18:24:16

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Re: 37 B timing marks in reply to John T, 05-29-2007 15:06:27

I have timed a mag for my D, but I have never timed the cam and crankshaft before, that is what I am kinda wondering about, I have no manual for this tractor, but I have one for the styled B, should almost be the same hey. Thanks for your help, it"s greatly appreciated

Rob

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Mike M

05-29-2007 07:57:57

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Re: 37 B timing marks in reply to John T, 05-29-2007 07:15:56

You should be able to make a quick check of the cam timing by using the LH EXH. mark

I'm trying to remember ? I think once you go to TDC then go on past to the LH exh. mark that LH ex. valve will just have it's free play gone and start to open. I think the mark can maybe ? be off by a little and still be fine.

You should be able to look into the spark plug hole and verify the piston is actually at TDC when the mark is too.

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