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Allis Chalmers Discussion Forum

D17 Timing

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Author  [Modern View]

11-23-2016 13:04:29

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Having a heck of a time with timing on my D17.

Bought it last year had points ran great.
Couple months ago i left the ignition on and fried the points.

Its a 12v positive generator.

Decided to switch to electric ignition.
Had to adjust the timing a hair to get it running but nothing drastic.

Then after sitting a couple weeks it wouldnt start kept backfiring. Had to turn the distributer probably a quarter turn but then it ran good and strong.

Now, a couple weeks later, it wont start again and backfires.

So it seems that it keeps jumping out of time.

The previous ownervsaid the owner before had gone through the engine with the intention of making it a pulling tractor if that would have anything to do with anything.

Any guesses would be appreciated!!!!

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11-26-2016 17:39:52

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 Re: D17 Timing in reply to luke470, 11-23-2016 13:04:29  
Thanks much for the replies!
Can the gear at the bottom of the distributer be removed?
And any tips on where to get one?

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11-24-2016 08:09:34

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 Re: D17 Timing in reply to luke470, 11-23-2016 13:04:29  
This situation only involves the older D-17 tractors that had the power steering pump as part of the governor drive. Newer models that had the belt driven pump above the generator are not affected by this. Any of those older models that have the tachometer cable, usually leak the oil out over time. If one checks the oil regularly and refills it, no problem. I have packed a few in gun grease for the owner who I knew would never check the oil.

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Brian G. NY

11-23-2016 19:23:30

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 Re: D17 Timing in reply to luke470, 11-23-2016 13:04:29  
Quoting Removed, click Modern View to see

Doc, as usual you got it!

When I first got my D-17 I discovered the dist. gear was worn badly and I replaced it.

After going thru the manual, I found the section relating to keeping oil in that cavity. There is an 1/8" plug around behind the distributor housing and the level is supposed to be maintained at 1-5/8" from the top with 20W oil. Shortly after that, I had to fix a "blown" governor and replaced all the bearings and seals in the P.S. pump at the same time. I suspect oil had been somehow been leaking out of a bad seal.

Since that time I check the oil in there every now and again and so far I have not had to add any.

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11-23-2016 14:24:02

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 Re: D17 Timing in reply to luke470, 11-23-2016 13:04:29  
Remove the distributer cap and make note of exactly where the rotor tip is pointing. Remove the dist from the engine and check the drive gear teeth on the bottom of it. Old D-17's have to have oil in that gear cavity to lube the gears. Seems like after all these years everyone has forgotten that. That's where I'd be looking first.

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11-24-2016 07:21:00

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 Re: D17 Timing in reply to DrAllis, 11-23-2016 14:24:02  
I have had several distributor drives apart and they have had grease in them. Sometimes old dry grease which I have cleaned out and replaced with fresh grease. In fact one Farmall A was dry and rusty and the gear teeth were worn out and it would skip time but it had the remains of grease. The D-17 is different? I have oiled the distributor bushings through the 1/8 npt plug in the side of the distributor and lubed the bushings in the drive with oil through the 1/8 npt plug in that, but as I said the actual gear boxes have had grease. But I haven't worked on anything new like a D-17. Just for general knowledge I would be interested to know. Thanks.

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11-23-2016 18:46:43

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 Re: D17 Timing in reply to DrAllis, 11-23-2016 14:24:02  
Doctor, I hate to butt in on Luke's thread, but I have always been very impressed with your extensive knowledge of "ALL" AC products. Were you a dealer mechanic, or a dealership owner? Once again, "hats off" to your contributions to this particular section of YT.

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