Farm Equipment - D 15 Dwell and Rpm

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D 15 Dwell and Rpm

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=194751
Printed Date: 04 Nov 2025 at 7:46am
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Topic: D 15 Dwell and Rpm

Posted By: ACinSC
Subject: D 15 Dwell and Rpm
Date Posted: 21 Apr 2023 at 12:24pm

According to my 50 year old hand held meter , the dwell is 34 at idle and 32 wide open . Rpm is 800 idle and 1800 WOT . Runs good , so I'm guessing this is ok ? Any thoughts ? Thanks !

Replies:

Posted By: DrAllis
Date Posted: 21 Apr 2023 at 1:02pm

Wide open throttle is to be 2,200 RPM on a D-15.

Posted By: ACinSC
Date Posted: 21 Apr 2023 at 1:41pm

Okay, sounds like something ain't quite right? Plan B . Thanks Dr Allis

Posted By: DrAllis
Date Posted: 21 Apr 2023 at 10:20pm

On the right side of the engine, there is a stop bolt that the governor spring lever hits when at the wide open position. Remove this bolt and adjust linkage to gain RPM's at the full throttle position. The governor spring lever can only rotate CCW so far and it will hit the vertical governor cross arm. That is the maximum RPM you can achieve with that spring. A new spring/plunger assembly is usually stiffer than an old one and will increase RPM's.

Posted By: ACinSC
Date Posted: 22 Apr 2023 at 6:45am

Thanks Dr Allis . I noticed this gov lever had a good bit of wiggle . Took it off and cleaned it up and found it had been brazed . Guess it broke years ago , before I bought it . Someone also wrapped teflon tape around the vertical nipple it goes on . Guess it's worn and needs a bushing ? Don't see one on the Agco site . Says new arm comes with bushing . Should say this Governor lever arm is #70234113 . Thanks again !

Posted By: ACinSC
Date Posted: 24 Apr 2023 at 2:35pm

Have a #70234113 governor lever arm on the way . Nice to be able to get parts for my 60 year old tractor . When it arrives I'll install it and go from there . Would like to get the RPM up to 2,200 . Thanks !

Posted By: DrAllis
Date Posted: 24 Apr 2023 at 2:38pm

New governor spring/plunger would be good.

Posted By: ACinSC
Date Posted: 24 Apr 2023 at 4:42pm

Is that the short spring with the metal piece inside? Thanks!

Posted By: DrAllis
Date Posted: 24 Apr 2023 at 5:22pm

YES. That spring controls your speed and especially top speed.

Posted By: ACinSC
Date Posted: 24 Apr 2023 at 6:20pm

Okay thanks Dr Allis. I'll see if I can get them.

Posted By: ACinSC
Date Posted: 02 May 2023 at 1:34pm

Test run today with new #70234113 governor lever arm . WOT is still 1,800 rpm . Idle rpm is down from 800 to 600 . Plan to replace the #7022316 plunger and spring and re-test . Thanks !

Posted By: DrAllis
Date Posted: 02 May 2023 at 2:10pm

Did you remove the stop bolt and readjust the linkage so it cranks the lever all the way around ?????????????

Posted By: ACinSC
Date Posted: 02 May 2023 at 3:21pm

Stop bolt doesn't touch this new lever arm unless I hold throttle lever all the way down . Thanks DR Allis !

Posted By: steve(ill)
Date Posted: 02 May 2023 at 3:40pm

if you disconnect the carburetor rod on the left side of the tractor where it attaches to the governor cross arm.... will the throttle go to wide open and touch the Stop ?

make sure that cross arm is not dragging on the thermostat housing or hose when at WIDE open.

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Like them all, but love the "B"s.

Posted By: DrAllis
Date Posted: 02 May 2023 at 3:53pm

I told you to remove the stop bolt and then adjust the linkage so the governor spring lever is rotated as far as it can go !! That's how you increase RPM's

Posted By: ACinSC
Date Posted: 02 May 2023 at 4:24pm

No Steve , makes no difference with carb rod off . Thanks !

Posted By: ACinSC
Date Posted: 02 May 2023 at 4:26pm

I'm not understanding , Dr Allis . Adjust/bend the linkage behind the rad , or something else ? Thanks !

Posted By: DrAllis
Date Posted: 02 May 2023 at 4:59pm

Step #1. Remove the governor spring lever stop bolt and throw it away. Step #2. Remove the right side panel under the fuel tank. Step #3. Find the throttle rod that activates the governor spring arm. Loosen the setscrew and adjust this rod so it is LONGER. Make it long enough to make that governor spring arm swing around as far as it can go, with the hand throttle still going clear DOWN horizontal. Recheck and make sure you can still reach slow idle speed.

Posted By: ACinSC
Date Posted: 02 May 2023 at 5:53pm

Got it! Thanks Dr Allis. I'll see how it goes tomorrow. Thanks again!

Posted By: ACinSC
Date Posted: 03 May 2023 at 11:25am

Lengthened throttle rod about 1/2" , just about to the very end of rod . WOT is up from 1800 to 1900 . Pulled gov arm back by hand and that's as far as it goes . Gonna see if I can borrow another meter , maybe mine's not reading right ? THANKS !!

Posted By: steve(ill)
Date Posted: 03 May 2023 at 12:22pm

what stops the arm from moving further ?? Or are you saying its hitting Internal ?

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Like them all, but love the "B"s.

Posted By: DrAllis
Date Posted: 03 May 2023 at 12:50pm

The governor spring arm can only swing so far and it hits the governor cross arm that goes in front of the engine. That's as far as it can go. I often times put a twist in the end of the gov spring arm to get a little more RPM out of it and a new spring usually helps s little too. I question the accuracy of his RPM meter.

Posted By: ACinSC
Date Posted: 03 May 2023 at 1:11pm

Not sure what's hitting Steve, but it's sure far as it'll go. Have a line on another meter and I'll retest. Thanks

Posted By: ACinSC
Date Posted: 03 May 2023 at 3:08pm

Dr Allis is right ! Gov arm hits the linkage behind the rad and that's far as it will go . Wonder if a new plunger and spring would increase the RPM ? Thanks !!

Posted By: ACinSC
Date Posted: 09 May 2023 at 11:13am

Installed new #70223516 spring/plunger today . WOT is now right at 2,220 rpm . Guess my old spring was weak and not opening the governor enough ? Idle is still 600 rpm . THANKS DR Allis and Steve !!

Posted By: ACinSC
Date Posted: 14 May 2024 at 11:28am

Here's the old post I was talking about Madcow.

Posted By: ACinSC
Date Posted: 25 Mar 2025 at 5:06am

Lots of good info on this old post. Good luck Tom!