D 15 governor
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=209155
Printed Date: 04 Feb 2026 at 5:18am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: D 15 governor
Posted By: ACinSC
Subject: D 15 governor
Date Posted: 30 Nov 2025 at 4:48am
| Pulling the disc and the engine over revved. Throttle lever also moves on its own. Have tractor in my little shop now. Pulled dist yesterday, gov shaft has a lot of play. Book says remove rad next,then gov. Anything else I need to do while I'm in there? Thanks |
Replies:
Posted By: DrAllis
Date Posted: 30 Nov 2025 at 10:45am
| Inspect for timing gear damage. Fix whatever is broken. |
Posted By: SteveM C/IL
Date Posted: 30 Nov 2025 at 11:27am
| ....and I remember MACK saying a nicked or slightly distorted timing gear tooth will cause bad harmonics and lead to another failure....sounds reasonable. Don't cut a corner? |
Posted By: ACinSC
Date Posted: 30 Nov 2025 at 12:50pm
|
Thanks Dr Allis and Steve M Probably just buy a new governor and be done with it. |
Posted By: SteveM C/IL
Date Posted: 01 Dec 2025 at 12:14am
| Oh but wait....you have to inspect the cam and crank gear for damage also! |
Posted By: ACinSC
Date Posted: 01 Dec 2025 at 3:37am
| Haven't got it off yet, but I hope for minimal damage. Only ran engine a few minutes. Thanks |
Posted By: ACinSC
Date Posted: 01 Dec 2025 at 3:02pm
| Have the gov off. Ears? on the weights have been hitting the inside of the housing. Guess something is missing or broken ? I'll try to get some pics posted. Thanks |
Posted By: steve(ill)
Date Posted: 01 Dec 2025 at 4:08pm
|
teardown... https://www.youtube.com/watch?v=aMzTrJO2gDw" rel="nofollow - https://www.youtube.com/watch?v=aMzTrJO2gDw ------------- Like them all, but love the "B"s. |
Posted By: ACinSC
Date Posted: 01 Dec 2025 at 5:19pm
| Thanks Steve! |
Posted By: steve(ill)
Date Posted: 01 Dec 2025 at 5:24pm
|
i have not reviewed all the you tube movie... Not saying the guy is 100% right.. but its a good base line for disassembly and repairs.. ------------- Like them all, but love the "B"s. |
Posted By: ACinSC
Date Posted: 01 Dec 2025 at 6:12pm
| I watched it, learned a couple things. Thanks! |
Posted By: WeisAC2
Date Posted: 01 Dec 2025 at 7:12pm
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Posted By: DrAllis
Date Posted: 01 Dec 2025 at 9:46pm
| For the record, a D-15 does not have a spring connected to the carburetor linkage. None. Just another old wives tale. |
Posted By: ACinSC
Date Posted: 02 Dec 2025 at 4:02am
| Thanks Dr Allis. Any thoughts on what happened to my governor? My plan is to replace it and also the larger bushing. Not sure how to pull the small one. Thanks again everyone! |
Posted By: DrAllis
Date Posted: 02 Dec 2025 at 6:29am
| Probably a bad plan when you have zero tooling to do so. I've OH'd 5 or 6 of those in the last 50 years and never replaced either bushing. The failure ?? 60 or 70 years of no one replacing the weights with new ones I'd imagine. Same old story with the 201/226 being far worse. |
Posted By: ACinSC
Date Posted: 02 Dec 2025 at 8:19am
| Thanks again Dr Allis.There's a lot of play at that larger bushing and it looks easy enough to replace.A new governor should outlast me easy enough. |
Posted By: ACinSC
Date Posted: 04 Dec 2025 at 10:53am
|
Now I see the weights have a inside ear? that keeps it from hitting the inside of the housing. One of mine is missing. Wonder where it is? Bottom of the oil pan would be good . Thanks |
Posted By: ACinSC
Date Posted: 05 Dec 2025 at 4:03pm
| Have center in window with #1 on the compression stroke. If I bar the engine over so the crank gear turns 2 full revolutions will it be in the same place? Thanks |
Posted By: steve(ill)
Date Posted: 05 Dec 2025 at 4:36pm
|
YES... every 2 revolutions you get on the COMPRESSION stroke... and you should see TDC #1.
------------- Like them all, but love the "B"s. |
Posted By: ACinSC
Date Posted: 05 Dec 2025 at 4:40pm
| Thanks Steve! |
Posted By: ACinSC
Date Posted: 07 Dec 2025 at 4:22am
|
Turned engine, have it back up on #1 with center in the window. Crank gear looks good No sign of the governor weight piece. May drain the oil and see if it's in the pan. Thanks |
Posted By: SteveM C/IL
Date Posted: 07 Dec 2025 at 1:45pm
| If it's not visible in or around gear train i wouldn't worry about it. It can do no harm in the pan. Likely hood that it ever makes it to drain hole is slim too. It's not magnetic so fishing for it not happening. |
Posted By: ACinSC
Date Posted: 08 Dec 2025 at 3:03am
| Thanks Steve M . Governor should be here in a few days and I'll put everything back together. |
Posted By: ACinSC
Date Posted: 09 Dec 2025 at 10:24am
| New governor is here. My book says the thrust bearing face goes to the front (radiator) . Is that the bearing end? Old one fell off before I could mark it . New governor has the bearing end to the back. Thanks |
Posted By: Alvin M
Date Posted: 09 Dec 2025 at 2:00pm
| Brg end to the front |
Posted By: ACinSC
Date Posted: 09 Dec 2025 at 2:56pm
| Thanks Alvin! Makes sense that the bearing end goes to the forks in the front. |
Posted By: ACinSC
Date Posted: 11 Dec 2025 at 7:35am
| I'm about done with this job and have another question. Book says at 1750 rpm F 25 should be in the window. Last time I had engine WOT with F 25 up. Which is correct? Think rpm is about 2200 wide open .Thanks |
Posted By: DrAllis
Date Posted: 11 Dec 2025 at 8:07am
| The distributer advance is fully advanced at 1750 RPM if everything in the 60 year old distributer is working correctly. If you do the wide-open-throttle setting it is no different than 1750 and no mistakes are made. You might think you are at 1750, but maybe your tachometer isn't quite accurate. Full throttle is the only way to do it on ANY A-C gas engine. |
Posted By: ACinSC
Date Posted: 11 Dec 2025 at 8:14am
| Thanks Dr Allis!! |
Posted By: ACinSC
Date Posted: 11 Dec 2025 at 2:32pm
|
Have my old D 15 running again Have 2 old dwell meters. One reads 30 and one 32 . Set the timing by ear. When I get some help I'll check it with my light.WOT is a little shy of 2200 .Thanks for the help guys! |
Posted By: ACinSC
Date Posted: 17 Dec 2025 at 11:05am
| Double checking myself and the distributor clamp doesn't look quite right. Anyone know how it goes? Hope to have pictures up soon. This is the clamp on the horizontal piece between the distributor and the governor.Thanks |
Posted By: steve(ill)
Date Posted: 17 Dec 2025 at 4:16pm
?????????? ------------- Like them all, but love the "B"s. |
Posted By: WeisAC2
Date Posted: 17 Dec 2025 at 5:46pm
 |
Posted By: ACinSC
Date Posted: 18 Dec 2025 at 2:22am
| That's it Steve. Right under the governor stop. Kinda hard to see in your picture but it looks like mine is wrong. Thanks |
Posted By: steve(ill)
Date Posted: 18 Dec 2025 at 7:51am
|
rotate the foot part UP... so it sets on the distributor flange and the forms an "L" bracket , similar to my photo..... my photo looks cast, yours is sheet metal, but they should do the same thing. ------------- Like them all, but love the "B"s. |
Posted By: steve(ill)
Date Posted: 18 Dec 2025 at 7:59am
|
not a real good photo, but the EAR goes on top and points back at the distrib. the clamp is just a PINCH fit... if the EAR is too short, youi might have to put the clamp in a vice and bend it back to 90 degrees or a little more so the leg touches the flange... when you tightne the nut it PINCHES down  ------------- Like them all, but love the "B"s. |
Posted By: ACinSC
Date Posted: 18 Dec 2025 at 10:23am
| Thanks a bunch Steve! |
Posted By: WeisAC2
Date Posted: 18 Dec 2025 at 11:14am
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Posted By: ACinSC
Date Posted: 18 Dec 2025 at 11:44am
| That looks better. Thanks again Steve |