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Model R won't slow idle

L

Lyndon - AB

Member
I'm working on an early model R (SN 1531) and I'm having an issue with it not idling properly. It runs fine at higher RPM, and seems to pull well, but won't idle below around 900 or 1000 rpm. It just seems to slowly coast down until it dies. I'm checking all the rack and governor settings, but a pointer in the right direction would be great.

Also, with setting the rack spring, what do they mean in the manual by "10-rack" position?
 
(quoted from post at 13:12:31 03/22/16) I'm working on an early model R (SN 1531) and I'm having an issue with it not idling properly. It runs fine at higher RPM, and seems to pull well, but won't idle below around 900 or 1000 rpm. It just seems to slowly coast down until it dies. I'm checking all the rack and governor settings, but a pointer in the right direction would be great.

Also, with setting the rack spring, what do they mean in the manual by "10-rack" position?
Click to expand...

The rack is the rod that the governor moves from side to side. It rotates the fuel pump Pistons to control the amount of fuel delivered to the injectors.
If you take the fuel pump cover off you will see the rack, it should be free enough for you to move by hand, rotating the Pistons.
At one side, not sure which, it will have some lines across it. The 10 rack position is the tenth mark.
I think the service manual has some good photos and description on governor setting.

No doubt Gary Power will be able to help you more!..
 
Thanks for the pointer, I'll try to find those marks. That's what was really hanging me up with setting the rack spring, I couldn't tell exactly where the rack had to be.
 
Well, now I'm stumped. Checked rack setting, it's good. Moves freely. Took timing cover off and checked governor. Everything looks good in there. Could it be something in the pumps themselves?
 
(quoted from post at 11:57:11 03/23/16)
Can't help you there.
Could the governor weights be sticking?
Click to expand...

Weights move freely, and all the settings are correct. Just finished setting valves, they weren't far out. Timing and injection timing are correct. Pretty much all that's left is the pumps themselves, I'm thinking.
 
If the tractor has been sitting for awhile the pumps could be gummed up . set throttle wide open tractor not running , move the rack back and forth several times to free up the pumps . It will help if you let fuel bleed thru. the pumps while doing it . If that doesn't work the pumps and nozzles need to be run .
 
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