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Allis Chalmers D-17 Throttle/Governor


 
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aaronknodel
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PostPosted: Fri Feb 12, 2021 1:52 pm    Post subject: Allis Chalmers D-17 Throttle/Governor Reply to specific post Reply with quote

Hi all, so after a governor weight came free and chewed up the timing gears I've got my D-17 back together and running, but the throttle is all out of whack. It idles way too fast almost close to wide open, and the throttle lever has only about half an inch of movement to wide open. It looks like the linkage is hardly moving after the governor so it seems like the problem is in there, anything I should be looking for when I take it apart again? Thanks
 
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DrAllis
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PostPosted: Fri Feb 12, 2021 3:48 pm    Post subject: Re: Allis Chalmers D-17 Throttle/Governor Reply to specific post Reply with quote

Are you absolutely sure you have the sliding sleeve on the governor assembly installed correctly?? The ball bearing goes towards the radiator. The largest diameter goes towards the rear. Until you KNOW that this correct, nothing else matters at this point. With the engine OFF and hand throttle half-way down, you should be able to grab the vertical governor arm behind the generator and move it forward (against spring force) and let go of it and it should spring backwards. Total movement is just an inch or so. If this is free to move, then the next step is synchronizing the governor to the carburetor. Leave the hand throttle half-open. Remove the cotter pin at the top of the vertical governor arm. Pull out the carb link rod. The governor arm should not move rearwards one bit. If it does move rearward, bend the link rod down in the middle to shorten it. Make it so it will just slide back into the arm hole. Now, when you place the hand throttle clear UP, the carb throttle shaft should be clear shut against the adjustable idle speed screw, so the engine will idle. If this is OK, fire it up and see what you've got.
 
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aaronknodel
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PostPosted: Thu Feb 18, 2021 1:07 pm    Post subject: Re: Allis Chalmers D-17 Throttle/Governor Reply to specific post Reply with quote

Thanks for the quick response! So I can confirm that the governor assembly sliding sleeve is put in correctly. To your second point the vertical arm does move forward against spring pressure about and inch and spring back. To your third point, when I remove the carb link the vertical arm does move back a little, (towards the rear of the tractor). However I'm not sure that the carb link is the issue, I am thinking it may be the horizontal shaft in the timing case. The reason I think this is when the vertical arm is free from the carb link I can see the little forked piece (which makes contact with the thrust bearing on the governor shaft) move back and forth when I move the hand throttle up and down, however when I re-attach the carb link and the vertical arm, this forked piece barely moves a quarter inch, am I correct in assuming this shouldn't be the case? It's clearly not engaging the way it should be.
 
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DrAllis
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PostPosted: Thu Feb 18, 2021 4:23 pm    Post subject: Re: Allis Chalmers D-17 Throttle/Governor Reply to specific post Reply with quote

Shorten (bend) the link rod like I said to do and try it !!! 1/4" too long makes a HUGE difference how the governor works.
 
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aaronknodel
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PostPosted: Fri Apr 23, 2021 12:12 pm    Post subject: Re: Allis Chalmers D-17 Throttle/Governor Reply to specific post Reply with quote

DrAllis wrote:
(quoted from post at 17:23:40 02/18/21) Shorten (bend) the link rod like I said to do and try it !!! 1/4" too long makes a HUGE difference how the governor works.


Hi there, sorry for the hiatus, lots of things on the go, finally getting back to the Allis and I just need to clarify, when testing for backwards movement on the vertical arm, is this with the governor in place or not? when it is in place it now has no backwards movement, when not in place and the hand throttle at half the vertical arm is so far back the carb link rod would have to be several inches shorter which doesn't seem quite right, so it appears that going back to your first response that there is no backwards movement in the arm, any ideas what to try next?
 
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DrAllis
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PostPosted: Fri Apr 23, 2021 5:55 pm    Post subject: Re: Allis Chalmers D-17 Throttle/Governor Reply to specific post Reply with quote

The governor assembly has to be assembled completely to check for this arm movement. Re-read and follow my steps and retest engine performance.
 
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DrAllis
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PostPosted: Sat Apr 24, 2021 3:33 am    Post subject: Re: Allis Chalmers D-17 Throttle/Governor Reply to specific post Reply with quote

Also, when you place the hand throttle UP as far as it will go, the carb throttle shaft MUST be closed tightly against the low idle speed adjustment screw. You should not be able to move the vertical arm at all because it is forced forward. This is adjustment under the fuel tank if it isn't idling 100% down, not really a governor issue, but a hand throttle issue via the governor to the carb.
 
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