1950 Model M Questions Again

Danny in CO

Well-known Member
We have the basket case Model M running now. I have a few questions:

1. It it backfiring back through the carb. Valves are set correctly and it is timed correctly (I think). Timing light on #1 plug (closest to radiator) and see DC in the timing window. What would cause it to back fire?

2. How do you set the carb linkage? It was a new carb and I hooked up the governor linkage how I think they go, but I'm not sure.

3. The carb has an idle adjustment screw at the throttle rod area. I set this screw at 1.5 turns out. There is a T valve at an angle on the back bottom. I don't know how to set this. 1.5 turns out too? All the way out? Not sure what it does.

Thanks!
 
(quoted from post at 17:59:22 01/21/17) We have the basket case Model M running now. I have a few questions:

1. It it backfiring back through the carb. Valves are set correctly and it is timed correctly (I think). Timing light on #1 plug (closest to radiator) and see DC in the timing window. What would cause it to back fire?

2. How do you set the carb linkage? It was a new carb and I hooked up the governor linkage how I think they go, but I'm not sure.

3. The carb has an idle adjustment screw at the throttle rod area. I set this screw at 1.5 turns out. There is a T valve at an angle on the back bottom. I don't know how to set this. 1.5 turns out too? All the way out? Not sure what it does.

4. The Hydraulic pump by the fan was off and disconnected when we started. How do you prime it?

Thanks!
 
Look on page 2. There is a post titled my tractor. Problem is about identical to yours. James posted the adjustment procedure along with pics.

When timing DC should show at low idle. SPARK will be centered in the window at full throttle. The idle adjustment screw you referred to sets low idle speed. If it dies when you throttle all the way down screw it in a little until it doesn't. The idle jet is top rear & 1 & 1/2 out is a good starting point - you want smooth at low idle. The T at bottom rear is your load screw. Start at 1 & 1/2 out. Throttle up and play with it till the engine runs the smoothest. I like to back it out till it just starts to roughen up a bit & then back in just a tad. If you aren't working it you can skip the last step.
 
"<font color="#6699ff">[b:654c4848f0][i:654c4848f0]How do you set the carb linkage?[/i:654c4848f0][/b:654c4848f0]</font>"

Reviewed the [b:654c4848f0]John Deere Model ?M? Tractors Service Manual SM2001[/b:654c4848f0] in the [b:654c4848f0]Engine[/b:654c4848f0] section in the [b:654c4848f0]Group 35 Governor[/b:654c4848f0] information under the [b:654c4848f0]Install and Adjust Governor Linkage[/b:654c4848f0] topic on pages 60-35-4 and 60-35-5.

Take a look at the diagram below.

a225034.jpg" width="650"


Note the hex jam nut (Key 8) and set screw (Key 9).

Take s look at the photo below.

a149398.jpg" width="650"


?[i:654c4848f0]Install governor screw and lock nut into fan bracket. Adjust stop screw until there is approximately 3/8-inch of it above lock nut. Do not tighten lock nut.[/i:654c4848f0]?

Take a look at the diagram below.

a225035.jpg" width="650"




Note the speed control lever (Key 1), governor control rod (Key 6), and bracket (Key 12).

?[i:654c4848f0]Pull throttle control rod lever as far downward as possible, that is, until throw on front end of throttle control rod is against stop on throttle rod front bracket.[/i:654c4848f0]?

Note the plain washers (Key 5), governor control rod (Key 15), spring (Key 14), and spring anchor (Key 13).

?[i:654c4848f0]Slip flat washer over front end of throttle control rod, and slip throttle-control-rod-to-governor linkage into place on rod. Install other flat washer, and finally place coil spring into position between throttle control rod and spring anchor pin. Be sure spring is seated in grooves provided for it.[/i:654c4848f0]?

Note the ball joint (Key 18) and governor-to-carburetor connecting rod (Key 19).

Take a look at the photo below.

a149399.jpg" width="650"


Take a look at the diagram below.

a225036.jpg" width="650"


Note the lever and shaft assembly (Key 2).

Take a look at the photo below.

a149400.jpg" width="650"


?[i:654c4848f0]Insert swivel joint of governor-to-carburetor linkage into governor operating shaft lever from outside. Tighten nut and lock washer securely. Move throttle control rod lever to full open position (throttle control lever on instrument panel as far up as possible).[/i:654c4848f0]"

Take a look at the diagram below.

a225037.jpg" width="650"


Note the throttle shaft (Key 8).

Take a look at the photo below.

a149401.jpg" width="650"


?[i:654c4848f0]Move the carburetor throttle fly to full open position (carburetor throttle fly arm as far forward as possible). Adjust rod of governor-to-carburetor linkage until it will fit in carburetor throttle fly assembly arm. Make this adjustment by turning rod of governor-to-carburetor linkage in or out of swivel joint. When linkage is of such length that it will just slip into carburetor throttle fly arm, without moving either the arm or governor lever, [b:654c4848f0]turn rod into swivel joint two complete turns[/b:654c4848f0], or until proper governor action is obtained. Tighten lock nut. Slip free end of rod into carburetor throttle fly arm and insert cotter key.[/i:654c4848f0]?

Note the yoke (Key 25) in the THROTTLE, CHOKE, AND STARTER CONTROLS diagram.

Take a look at the photo below.

a149404.jpg" width="650"


Note the governor lever (Key 3) in the GOVERNOR diagram.

Take a look at the photo below.

a149405.jpg" width="650"


?[i:654c4848f0]Disconnect throttle-control-rod-to-governor linkage yoke from governor lever, and move throttle control lever down as far down as possible.

Push governor lever as far down as possible. Turn adjustable yoke on throttle-control-rod-to-governor linkage until holes in yoke line up with hole in governor lever. [b:654c4848f0]Then unscrew yoke two complete turns[/b:654c4848f0]. This insures that throttle is tight against stop pin when throttle control rod is against stop on throttle control rod front bracket. Tighten lock nut. Insert pin and cotter key to attach yoke to governor lever.[/i:654c4848f0]?

Hope this helps.
 

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