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1929 JD “D” Setting Correct RPM


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  #1  
Old 07-14-2018, 11:08:06 AM
bmklawt bmklawt is offline
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Default 1929 JD “D” Setting Correct RPM

I have a 1929 JD D with a newly rebuilt engine, splitdorf magneto, and DLTX 3 carb. I can not get this thing to run any faster than 650 RPM’s, there is a new spring on the governor shaft and the spring is set back as far a possible I also lengthend the rod a bit and got the tractor to go from 550 RPM to 650 RPM but lengthening the rod more doesn’t increase the RPM’s.
What else can I do?
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Old 07-14-2018, 01:32:43 PM
bmklawt bmklawt is offline
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Default Re: 1929 JD “D” setting Correct RPM

Also the book says to have magneto trip at TDC when “L.H. RETARD SPARK” Mark lines up at the 3 o’clock position, I put a bore scope in the cylinder and the piston actually hits TDC about 12 degrees after the “L. H. RETARD SPARK” mark. I have the impulse spark set to trip at the actual TDC.
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Old 07-14-2018, 02:59:00 PM
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Default Re: 1929 JD “D” Setting Correct RPM

Over tightening the spring will cause it to not govern at all.
IF I recall correctly, with the governor arm fully open, the link should be a half hole short of the hole in the carburetor throttle hole.
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Old 07-14-2018, 05:07:33 PM
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Default Re: 1929 JD “D” setting Correct RPM

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Originally Posted by bmklawt View Post
Also the book says to have magneto trip at TDC when “L.H. RETARD SPARK” Mark lines up at the 3 o’clock position, I put a bore scope in the cylinder and the piston actually hits TDC about 12 degrees after the “L. H. RETARD SPARK” mark. I have the impulse spark set to trip at the actual TDC.
I think you will want the impuls to trip after tdc so it will not kick back when starting. If it trips at 12 degrees after tdc on impulse and has 20 degrees of impulse then when running will fire at 8 degrees before tdc or so.
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Old 07-14-2018, 06:27:42 PM
bmklawt bmklawt is offline
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Default Re: 1929 JD “D” Setting Correct RPM

I should also mention I put new bearings in the governor, is it possible I put the governor back together wrong?

I have a Wico X magneto so I put that on today, tractor runs better on the low RPM end with this mag but I still couldn't get it up past 600 RPM's
With either the Wico or Splitdorf mag on the tractor and impulse spark set at TDC or a degree or 2 past TDC it randomly will backfire, I can't really hear it but it blows the air cleaner out of the housing sometimes.
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Old 07-14-2018, 09:27:29 PM
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Default Re: 1929 JD “D” Setting Correct RPM

What is your butterfly doing at full throtte is it opening up or if you manually open it will the rpm increase. Timing and carb adjustments could also be part of the problem
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Old 07-15-2018, 12:08:47 AM
bmklawt bmklawt is offline
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Default Re: 1929 JD “D” Setting Correct RPM

At full throttle the governor is hunting, the butterfly goes from full open to about close, here is a short video, https://youtu.be/_lWU59myz20
I can manually hold the butterfly open and get it to run at full speed in fact if I hold the throttle fully open I can get tractor to run up to 1200 RPMs
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Old 07-15-2018, 09:47:52 AM
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Default Re: 1929 JD “D” Setting Correct RPM

If the governor is hunting, the idle circuit in the carb is plugged. It goes lean, tries to die, the governor catches it & opens the throttle. Repeats over & over.
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Old 07-15-2018, 02:22:06 PM
bmklawt bmklawt is offline
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Default Re: 1929 JD “D” Setting Correct RPM

The carb a DLTX 3 was rebuilt by Roberts carburetor 10 to 15 years ago but has only been used a few hours sense the rebuild, I had the carb apart more than a few times and have visually checked all the passages. I can not find anything on the web that tells where the passages are and what size they should be so I’m just assuming I’ve checked them all.
Another short video showing the governor hunting, throttle lever is full forward, it’s only running at 500 RPMs
https://youtu.be/yTMAGB6bFpw
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Old 07-15-2018, 04:21:26 PM
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Default Re: 1929 JD “D” Setting Correct RPM

Have you tried holding the throttle at a lower position,to see if you can manually idle the tractor?I know you mentioned 500rpm-1200rpm.But can you manually get it to idle?If not,then my bet is the idle circuit.
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Old 07-15-2018, 06:10:31 PM
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Default Re: 1929 JD “D” Setting Correct RPM

I can hold the throttle and get it to idle lower.
Here is another short video so you can see and hear it idling manually and on its own this is about as slow as I can make it run. https://youtu.be/5WN7jBioZPk
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Old 07-15-2018, 09:53:45 PM
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Default Re: 1929 JD “D” Setting Correct RPM

I checked the governor spring pin location on my '29 D,and it's on the 4th hole back.The first three holes are grouped together,then there is a gap before the 4th hole.I just post this for comparison only.

I'm assuming the tighter you make the spring,the less sensitive it will be,as Craig said earlier.

Have you tried richening the idle circuit a bit?Are you able to get any black smoke?(As a sign that the carb CAN be richened.)
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Old 07-17-2018, 08:33:06 AM
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Default Re: 1929 JD “D” Setting Correct RPM

Have you done the 1/2-hole short thing as Craig mentioned? That takes the slack out of the governor & makes sure the weights are all the way in when the throttle is open. The carb has passages that may need to be reamed out with a wire or long drill bit. Visual won't get it. Open the idle screw way out, like Thresher said, it should get richer, if it doesn't the idle passages are plugged.
Spring tension is what sets the high idle speed. You need more tension on the spring to make it run faster...
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Old 07-17-2018, 09:39:36 AM
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Default Re: 1929 JD “D” Setting Correct RPM

Quote:
Originally Posted by ronm View Post
Have you done the 1/2-hole short thing as Craig mentioned? That takes the slack out of the governor & makes sure the weights are all the way in when the throttle is open. The carb has passages that may need to be reamed out with a wire or long drill bit. Visual won't get it. Open the idle screw way out, like Thresher said, it should get richer, if it doesn't the idle passages are plugged.
Spring tension is what sets the high idle speed. You need more tension on the spring to make it run faster...
Yes, a friend took my carb and cleaned out ALL the passages, made a huge difference somewhere.
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Old 07-18-2018, 10:29:08 PM
bmklawt bmklawt is offline
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Default Re: 1929 JD “D” Setting Correct RPM

Craig A wrote "IF I recall correctly, with the governor arm fully open, the link should be a half hole short of the hole in the carburetor throttle hole."

Fully open? Do you mean the governor arm should be as far toward the front of the tractor as possible, is the governor arm the linkage with the spring on it. If so I can not shorten it that much.

All passages on the carb are clear
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Old 07-18-2018, 11:58:01 PM
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Default Re: 1929 JD “D” Setting Correct RPM

With the engine not running push the throttle lever fully forward and adjust.
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Old 07-19-2018, 09:54:34 PM
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Default Re: 1929 JD “D” Setting Correct RPM

Craig A wrote I should be half hole short, I can only adjust it to half hole longer, I can not make the governor rod any shorter.
See photo in post #15
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Old 07-19-2018, 10:31:31 PM
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Default Re: 1929 JD “D” Setting Correct RPM

It wouldn't be the first time I had to shorten a governor rod.
The slightest amount of wear here and there adds up.
I had a Minny R in the shop with a hunting governor problem.
I had to cut a 1/2" out of the governor link to make it work properly.
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Old 07-29-2018, 02:23:21 PM
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I adjusted the throttle rod as Craig A suggested, no change that I could tell although it did feel harder to fight against the governor when I manually controlling the throttle.
Burrey's Carburetor rebuilt the carb back in 2011, and I just had a guy locally look at the carb and tell it looks good and all passages are clean.
after reinstalling the card and warming up the tractor I can close the load and idle needle and the tractor will still run.
New video of that: https://youtu.be/oYoNyLbixKE
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Old 07-29-2018, 03:08:59 PM
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Default Re: 1929 JD “D” Setting Correct RPM

In the beginning of your latest video,it was running REAL good.Any D owner would be proud of that.

If your friend didn't have the proper size drill bits,to check the passages,then you still can't be sure they're clean.You can't go by sight.Period.


That being said,i'm gonna let the experts take over.
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