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Ford Tractors Discussion Forum
Order Ford 801 Parts Online

1958 801 diesel uneven idle

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Kscha41

01-12-2020 07:22:45




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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.

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showcrop

01-15-2020 18:45:49




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 Re: 1958 801 diesel uneven idle in reply to Kscha41, 01-12-2020 07:22:45  
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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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Kscha41

01-15-2020 12:50:54




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 Re: 1958 801 diesel uneven idle in reply to Kscha41, 01-12-2020 07:22:45  
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.

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Dieseltech

01-14-2020 07:48:42




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 Re: 1958 801 diesel uneven idle in reply to Kscha41, 01-12-2020 07:22:45  
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.



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Kscha41

01-14-2020 09:26:35




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 Re: 1958 801 diesel uneven idle in reply to Dieseltech, 01-14-2020 07:48:42  
The pump model number is dbgvcc429---1aj. The engine ran smooth previously and the pump was rebuilt a year ago.



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showcrop

01-14-2020 06:09:34




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 Re: 1958 801 diesel uneven idle in reply to Kscha41, 01-12-2020 07:22:45  
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Did you check the positioning of the two gaskets? This is the usual cause of your problem.



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Kscha41

01-14-2020 06:24:46




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 Re: 1958 801 diesel uneven idle in reply to showcrop, 01-14-2020 06:09:34  

Hopefully my pics will load. This is the filter I took off this morning.



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Kscha41

01-14-2020 06:18:22




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 Re: 1958 801 diesel uneven idle in reply to showcrop, 01-14-2020 06:09:34  
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.



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Kscha41

01-14-2020 05:59:51




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 Re: 1958 801 diesel uneven idle in reply to Kscha41, 01-12-2020 07:22:45  
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.



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Kscha41

01-13-2020 14:21:55




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 Re: 1958 801 diesel uneven idle in reply to Kscha41, 01-12-2020 07:22:45  
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



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showcrop

01-13-2020 09:19:10




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 Re: 1958 801 diesel uneven idle in reply to Kscha41, 01-12-2020 07:22:45  
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I would remove the filter and check the positioning of the two gaskets.



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Kscha41

01-13-2020 09:33:41




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 Re: 1958 801 diesel uneven idle in reply to showcrop, 01-13-2020 09:19:10  
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



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Sean in PA

01-13-2020 09:19:00




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 Re: 1958 801 diesel uneven idle in reply to Kscha41, 01-12-2020 07:22:45  
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.

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Sean in PA

01-12-2020 20:02:42




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 Re: 1958 801 diesel uneven idle in reply to Kscha41, 01-12-2020 07:22:45  
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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.

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Kscha41

01-13-2020 08:08:54




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 Re: 1958 801 diesel uneven idle in reply to Sean in PA, 01-12-2020 20:02:42  
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?



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showcrop

01-12-2020 11:43:22




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 Re: 1958 801 diesel uneven idle in reply to Kscha41, 01-12-2020 07:22:45  
Sounds to me like it is sucking air. The most likely place is at the filter.



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Kscha41

01-12-2020 19:08:21




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 Re: 1958 801 diesel uneven idle in reply to showcrop, 01-12-2020 11:43:22  
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?



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