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1958 801 diesel uneven idle

K

Kscha41

Member
Hello everyone, I have a new problem that I'm hoping someone can help me with. Recently I was trying to fix a few fuel leaks on my tractor so I replaced the fuel shut off valve along with a new line to go to the valve to the filter, a new filter and four new injection lines. Everything for the most part went smoothly but now after bleeding everything and running the tractor, it seems my idle up to about 1200 rpm isn't smooth. It seems like a cylinder isn't firing or timing is off. Even though I didn't take the pump off, so the timing should still be good, I tried adjusting the timing both ways with the same miss at idle. You can hear it in the exhaust and see the exhaust cap flap every time the cylinder misses. As soon as you throttle up past 1200 rpm, it smooths out and you would never know. There is no excess smoke at idle and I had both the injectors and pump rebuilt a year ago. I dont want to do any damage to the motor, so I would like to fix this issue. Thanks for your help.
 
Ok thanks. I will try to tighten it up
tomorrow and see if it will help. Could
it possibly suck air at any of the
injection lines if they are not leaking
externally?
 
(quoted from post at 23:08:21 01/12/20) Ok thanks. I will try to tighten it up
tomorrow and see if it will help. Could
it possibly suck air at any of the
injection lines if they are not leaking
externally?
Click to expand...

The lines from the pump to the injectors are under pressure not suction, so no, they should not be sucking air if they are leaking. If they leak, it would be fuel leaking out, not air leaking in. The lines from the tank to and through the filter and on to the injection pump itself are the only ones that are under suction, and therefore the only places where it could be sucking air, or there could be leak in the fuel intake end of the pump itself.
 
Thanks everyone for the help. I just
tried to tighten the filter alittle and I
still have the same result. It seems most
noticeable around 700 to 900 rpm. I also
checked and even tightened both the
incoming line to the filter and to the
pump and neither changed anything. I
wonder if the filter can be defective and
if I should just change it out?
 
If it was running good before you made those initial changes then I would double check everything on the suction/supply side of the pump that you changed. Since you say that you tightened the filter some more, I would recommend that you double check the connections at both ends of the new line between the shut off valve and the filter housing, as it could be sucking air at either of those locations.
 
(quoted from post at 09:08:54 01/13/20) Thanks everyone for the help. I just
tried to tighten the filter alittle and I
still have the same result. It seems most
noticeable around 700 to 900 rpm. I also
checked and even tightened both the
incoming line to the filter and to the
pump and neither changed anything. I
wonder if the filter can be defective and
if I should just change it out?
Click to expand...

I would remove the filter and check the positioning of the two gaskets.
 
Yes everything ran great before I changed
the valve, lines and filter. I did
tighten the line going into the filter a
little though it was not leaking when the
tractor is off. I will take the filter
off and check and see if I notice anything
obvious. Thanks
 
Ok, I decided to just buy a new filter. So tomorrow I will install and give a update. Another quick question, will this hurt a injector or the motor if I run it this way for a period of time? Thanks
 
Well this morning I changed out the filter and bled the filter and I have the same results. It starts up great and runs great at high rpm but still sounds like it has a cam in it between the certain rpm range. I also made sure again the fuel lines where tight and not leaking.
 
(quoted from post at 06:59:51 01/14/20) Well this morning I changed out the filter and bled the filter and I have the same results. It starts up great and runs great at high rpm but still sounds like it has a cam in it between the certain rpm range. I also made sure again the fuel lines where tight and not leaking.
Click to expand...

Did you check the positioning of the two gaskets? This is the usual cause of your problem.
 
Nothing stood out about the gaskets being
in the wrong spot. Both the upper and
lower both seemed to be located at the
edge all the way around.
 

cvphoto2197.jpg


cvphoto2198.jpg


Hopefully my pics will load. This is the
filter I took off this morning.
 
Just a thought, is the injection pump an early 4C or 5C model? The early Ford pumps did not have a delivery valve in the rotor like the later pumps do, and sometimes did not run as smooth as the late pumps did. I still see some of the older pumps in for repair that were never exchanged for the later pump.
 
The pump model number is dbgvcc429---1aj. The engine ran smooth previously and the pump was rebuilt a year ago.
 
Well I got it fixed. I decided today that it wouldn't hurt to put the old injection lines back on so one by one I swapped them out and started it back up in between swapping lines. Every time I started it, it sounded better and better until I got to the last one and she was back to her normal pur. So for some reason something is different with the new lines causing this. Thanks everyone for your help.
 
(quoted from post at 13:50:54 01/15/20) Well I got it fixed. I decided today that it wouldn't hurt to put the old injection lines back on so one by one I swapped them out and started it back up in between swapping lines. Every time I started it, it sounded better and better until I got to the last one and she was back to her normal pur. So for some reason something is different with the new lines causing this. Thanks everyone for your help.
Click to expand...

About the only thing that could be wrong is the ID. It would be hard to tell without the proper tool.
 
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