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Thread: M923 nhc250 replaced injector pump still no joy!

  1. #31
    Sergeant Major Over's Avatar
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    Quote Originally Posted by WillWagner View Post
    I think he has used a bunch so far....
    Used more Starting Fluid than I care to think about. When the rain comes and goes I'll jump on top and check the cam then pull the injectors. 15 minute job, right?
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  2. #32
    Moderator WillWagner's Avatar
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    All, a bit longer than that. I hear ya on the rain! It has been pouring here for two days. No need to pull the boxes, loosen and pull the injector adjuster, flop the lever back and then pull the hold downs and injectors....don't drop the hold down bolts down the push tube cavity!
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    Sergeant Major Over's Avatar
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    FINALLY GOT HER GOING!!! Appreciate all the help here and special shout out to Wess and his videos! Noticed when I pinched the return line it tried but no go. Then I noticed the rubber return line was leaking at the first joint due to the hose being old and brittle. Went and set up a fuel line into the PT Pump from a gallon container, then I replaced the rubber return line and let the new one run into the container. I filled the jug with 1/2 Diesel Kleen, added a bottle of of LiquiMoly Complete Diesel System Cleaner (Couldn't find their Diesel Purge here) then added Diesel to top of the jug. First I used a clamp on the return line then gave it a go. She really tried and was so close I hit the mushroom intake with some starter fluid. Took a couple of try's then she ran under her own power. When it sped up I would loosen the clamp she would slow down then tighten again to speed up. When pushing the throttle not much happened so I just let it run, clamp, un-clamp. After a while I think the injectors started loosening up and she would respond to throttle. Finally pulled the clamp and let her run thru 2 gallons of the witches brew. Connected everything back up, primed and she started again! Woke up the next morning (40 degrees) and she smoked and tried, finally started when I just left the throttle alone and didn't mash it.
    Question: Cold starting a NCH250 should I leave the throttle at rest or press it. I know my diesel 6.2 Burb doesn't like a lot of throttle on cold mornings. Again thanks to everyone here!!!!!!!!!!
    20190210_153021.jpg
    Last edited by Over; 02-12-2019 at 00:43.
    M923A0 "PATROL" The successful a/c experiment! FOR SALE
    A/C; Air Ride Seat; Tinted Windows; 24-12 100 Amp Converter; Solargizer
    HMMWV 1989 4 door soft top
    M936A2 Wrecker (My mobile Cherry Picker)
    M923A0 Tan FOR SALE
    M923A0 Marine with locking axles FOR SALE
    M925A0 Camo FOR SALE
    M923A2 Camo
    1995 F350 PowerStroke, Crew Cab, Long Bed 4x4 with 250,000 on it
    1995 6.5 Turbo Diesel Burb, 4x4
    Assorted Diesel MEP 5kw and 10kw Generators
    Ural (Russian BMW) with Side Car (Driven Side Car Wheel)
    Will go anywhere a ATV can go! MG42 Mount on Side Car
    If this was the 70's I would have been carrying the ice and beer!
    1945 M29 Weasel Tracked-SOLD
    Chenowith DPV (Only one in the USA) SOLD

  4. #34
    I'm the dude, man. Steel Soldiers Vendor simp5782's Avatar
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    Should fire at no throttle with a good fuel system. Some ether may be used if below 32 degrees
    2008 F-250 6.4L Powerstroke
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    Over (02-12-2019)

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    Over,

    It sounds like you had two problems? A leaky return line and gummed up injectors?
    For cold starts (32F and colder), my truck wants exactly what the dash data plate says- "Apply 1/3 foot throttle." It definitely does not like more than that. The warmer the temps, the less pedal it wants.
    Motorpool:

    (Isn't owning one of this insanity enough??)
    1971 M813 "Ox" (named for Dewey Oxburger)

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    Over (02-12-2019)

  8. #36
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    Quote Originally Posted by Ajax MD View Post
    Over,

    It sounds like you had two problems? A leaky return line and gummed up injectors? For cold starts (32F and colder), my truck wants exactly what the dash data plate says- "Apply 1/3 foot throttle." It definitely does not like more than that. The warmer the temps, the less pedal it wants.


    Yes that's what I figured. My throttle pedal was sticking down a ways and seemed like to much diesel got to the cylinders so it just smoked. Throttle is sticking in that area right where you cant see it under the cab. A year sitting and I believe the diesel just gummed up on the injectors. Probably wouldn't happen on the M923A2's with their pressure injector system. The leaky return hose was a culprit in regard to when pinching the line it wouldn't let all the pressure build up to force it into the injectors. Other than that the return line should have been fine but was pretty hard and cracked. So after all the removing pumps and messing with everything I guess I could have just replaced the return line and pinched it. Gotta love the MV hobby learning curve! Now I wander out into the yard once a week starting my trucks up, good excuse for a beer!
    M923A0 "PATROL" The successful a/c experiment! FOR SALE
    A/C; Air Ride Seat; Tinted Windows; 24-12 100 Amp Converter; Solargizer
    HMMWV 1989 4 door soft top
    M936A2 Wrecker (My mobile Cherry Picker)
    M923A0 Tan FOR SALE
    M923A0 Marine with locking axles FOR SALE
    M925A0 Camo FOR SALE
    M923A2 Camo
    1995 F350 PowerStroke, Crew Cab, Long Bed 4x4 with 250,000 on it
    1995 6.5 Turbo Diesel Burb, 4x4
    Assorted Diesel MEP 5kw and 10kw Generators
    Ural (Russian BMW) with Side Car (Driven Side Car Wheel)
    Will go anywhere a ATV can go! MG42 Mount on Side Car
    If this was the 70's I would have been carrying the ice and beer!
    1945 M29 Weasel Tracked-SOLD
    Chenowith DPV (Only one in the USA) SOLD

  9. #37
    Sergeant Major Over's Avatar
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    Quote Originally Posted by simp5782 View Post
    Should fire at no throttle with a good fuel system. Some ether may be used if below 32 degrees
    Your videos are a great help! Need to go thru some I saw that addresses other issues I have on the trucks. Shortens the learning curve! Thanks again!
    M923A0 "PATROL" The successful a/c experiment! FOR SALE
    A/C; Air Ride Seat; Tinted Windows; 24-12 100 Amp Converter; Solargizer
    HMMWV 1989 4 door soft top
    M936A2 Wrecker (My mobile Cherry Picker)
    M923A0 Tan FOR SALE
    M923A0 Marine with locking axles FOR SALE
    M925A0 Camo FOR SALE
    M923A2 Camo
    1995 F350 PowerStroke, Crew Cab, Long Bed 4x4 with 250,000 on it
    1995 6.5 Turbo Diesel Burb, 4x4
    Assorted Diesel MEP 5kw and 10kw Generators
    Ural (Russian BMW) with Side Car (Driven Side Car Wheel)
    Will go anywhere a ATV can go! MG42 Mount on Side Car
    If this was the 70's I would have been carrying the ice and beer!
    1945 M29 Weasel Tracked-SOLD
    Chenowith DPV (Only one in the USA) SOLD

  10. #38
    Colonel Ajax MD's Avatar
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    Heh, the reason I asked for confirmation of your solutions is to shorten my own learning curve. I'm not having any problems *yet* but it's probably only a matter of time so the more knowledge I absorb now, the less painful it'll be later...
    Motorpool:

    (Isn't owning one of this insanity enough??)
    1971 M813 "Ox" (named for Dewey Oxburger)

  11. #39
    Sergeant Major Over's Avatar
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    Quote Originally Posted by Ajax MD View Post
    Heh, the reason I asked for confirmation of your solutions is to shorten my own learning curve. I'm not having any problems *yet* but it's probably only a matter of time so the more knowledge I absorb now, the less painful it'll be later...
    Understand! Wish this thread was up when my Gremlins started showing up. The world needs test dummies and I got elected to this one, lol!
    M923A0 "PATROL" The successful a/c experiment! FOR SALE
    A/C; Air Ride Seat; Tinted Windows; 24-12 100 Amp Converter; Solargizer
    HMMWV 1989 4 door soft top
    M936A2 Wrecker (My mobile Cherry Picker)
    M923A0 Tan FOR SALE
    M923A0 Marine with locking axles FOR SALE
    M925A0 Camo FOR SALE
    M923A2 Camo
    1995 F350 PowerStroke, Crew Cab, Long Bed 4x4 with 250,000 on it
    1995 6.5 Turbo Diesel Burb, 4x4
    Assorted Diesel MEP 5kw and 10kw Generators
    Ural (Russian BMW) with Side Car (Driven Side Car Wheel)
    Will go anywhere a ATV can go! MG42 Mount on Side Car
    If this was the 70's I would have been carrying the ice and beer!
    1945 M29 Weasel Tracked-SOLD
    Chenowith DPV (Only one in the USA) SOLD

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