HD3 Allis dozer

Mr. T. Minnesota · Jul 2, 2020

Forum Members,
Been a while since I have been on the Forum.
I have a 1965 HD3 Allis dozer. Due to a snowy winter I was not able to get to northern Minnesota to run the diesel dozer. Got to the cabin in late May and found it difficult to start. Seems fuel had drained down out of the injectors and for that matter from the tank to the injectors. A friend of mine said to me one must run the old equipment often to keep it. Question is how can I prevent the fuel system from draining down. Is there a secret other than running it often. Any and all info will be appreciated.
Thank you.

Nordic · Jul 2, 2020

(reply to post at 12:37:08 07/02/20)

n all likelihood there is a very slow fuel leak somewhere enroute from the tank to the injector pump or even the the injector pump itself. Wherever you have a tiny drip it gets replaced with air if it makes for difficult starting. I've had this happen more than once. it can take a lot of observation before you find out where it is. A perfectly sealed system will always stay full. It makes it easier to find if the machine is pressure washed and once dry put cardboard under it to help detect the drip.

Mr. T. Minnesota · Jul 2, 2020

Thanks for the reply. When I get to northern Minnesota I will do a complete clean up and do a drip check. I noticed there was new dark spot on the concrete when I was there in
May. Just have to figure out the exact location of the leak.

AJ. · Jul 3, 2020

The fuel can't drain down when the fuel tank is higher than the injector pump,the best thing when parking up is service the fuel system,drain sediment from the tank,clean the bowl and change the filters,bleed the system and run the engine for a while to expel any trapped air,the,reason for this is to get rid of any moisture or water from the system that can freeze and turn the fuel to gel,fill the fuel tank,when you stop the engine for hibernation make sure you put the stop control back to the run position and put the throttle on full,that machine should have a glow plug make sure it's working.
Good luck.
AJ

AJ. · Jul 3, 2020

The fuel can't drain down when the fuel tank is higher than the injector pump,the best thing when parking up is service the fuel system,drain sediment from the tank,clean the bowl and change the filters,bleed the system and run the engine for a while to expel any trapped air,the,reason for this is to get rid of any moisture or water from the system that can freeze and turn the fuel to gel,fill the fuel tank,when you stop the engine for hibernation make sure you put the stop control back to the run position and put the throttle on full,that machine should have a glow plug make sure it's working.
Good luck.
AJ

dpendzic · Jul 3, 2020

you may want to apply slight pressure to the fuel tank--say 5 psi-and it will help find any fuel leak--also a good way to bleed air out of the system

Mr. T. Minnesota · Jul 3, 2020

Thanks for the replies. To add to the situation two years I was having trouble with a leaking sediment bowl stem shaft. Since that time I have been closing down flow from the tank
to the fuel system. With your advice I will keep that open along with all other possible line shut offs. This along with all other advice it should take care of the problem. Thanks
again for the help.

dpendzic · Jul 3, 2020

Yep---that is probably your problem leaking there and letting air in

HD3 Allis dozer

Mr. T. Minnesota

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Nordic

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Mr. T. Minnesota

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AJ.

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AJ.

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dpendzic

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Mr. T. Minnesota

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dpendzic

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