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Thread: ford 8340 injector pump timing

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    Senior Member ford 7840's Avatar
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    ford 8340 injector pump timing

    do any body know witch way you need to rotate the injector pump to advance the timing on a ford 8340, i know it has maks 0 - 12 one way and o - 12 the other but witch way do it need to be turned to advance, standing looking at the back of the injector pump do it need to be moved clock wise or anti clock wise, i know a lot of you are going to say try it one way and if no change try the other but trying to move these pumps is not easy with every thing connect so i would like to know the correct way before i try it, it just seems very under powered and and the engine soon gets to normal running temp witch tells me it mite be retarded on the pump timing, any help would be handy thanks

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    Re: ford 8340 injector pump timing

    Quote Originally Posted by ford 7840 View Post
    do any body know witch way you need to rotate the injector pump to advance the timing on a ford 8340, i know it has maks 0 - 12 one way and o - 12 the other but witch way do it need to be turned to advance, standing looking at the back of the injector pump do it need to be moved clock wise or anti clock wise, i know a lot of you are going to say try it one way and if no change try the other but trying to move these pumps is not easy with every thing connect so i would like to know the correct way before i try it, it just seems very under powered and and the engine soon gets to normal running temp witch tells me it mite be retarded on the pump timing, any help would be handy thanks
    Long time since looking at one, but the gut feeling is that the pump is fixed, its the gear to hub mounting that has to be altered? - I think you'd be looking at removing the access plate on the front of the timing cover to access the 3 hub bolts, then rotate the engine in the direction it runs (clockwise IIRC) if thats correct then having loosened the hub bolts you would need to turn the hub the same way as the engines direction of rotation to advance it.

    Ideally you ought to find out the timing setting and the procedure to run through and then find out exactly where it is set? Otherwise your going to be playing Russian roulette?
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    Re: ford 8340 injector pump timing

    Unless the pump has been off before or always been wrong I would be cautious. Our 8340 warms up fairly quickly for a big 6l lump but it only over heats if the rads are dirty. They are old now and there could be a host of reasons for the engine being a bit flat . Does it smoke when pulling? Ours blue smokes a little at idle (particularly noticeable in certain light ) but has very little black smoke under load.
    I wonder if it would be better to start with a tappet check, filters and possibly an injector over haul?

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    Senior Member ford 7840's Avatar
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    Re: ford 8340 injector pump timing

    hi guys i think you might of got your wires crossed, the pump has been off and done up but i can see on the markings on the steel back timing case that the timing of the pump is set on 0 but when things wear and get a a good few hrs on them this might not need to me set to 0 as the must be wear and back lash in the timing gears. all i was wanted to know was witch was to turn the pump to try to get it to pull, i will work all day hard with out never getting hotter than it should but just seems very light on power so rads etc all ok,

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    Re: ford 8340 injector pump timing

    Quote Originally Posted by ford 7840 View Post
    hi guys i think you might of got your wires crossed, the pump has been off and done up but i can see on the markings on the steel back timing case that the timing of the pump is set on 0 but when things wear and get a a good few hrs on them this might not need to me set to 0 as the must be wear and back lash in the timing gears. all i was wanted to know was witch was to turn the pump to try to get it to pull, i will work all day hard with out never getting hotter than it should but just seems very light on power so rads etc all ok,
    Ah! sorry yes wires crossed.

    Out of interest why was the pump recon?

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    Senior Member ford 7840's Avatar
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    Re: ford 8340 injector pump timing

    diesel getting into sump via front seal, like most older tractors seals they get old and hard and leak, ive not had it long but seems very under powered to my 7840, if no one knows witch way to move it i will just have to have a play with it but i do not think i will be able to tell any different if its not pulling any thing hence i asked before moving it cos i could go the wrong way.

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    Re: ford 8340 injector pump timing

    Quote Originally Posted by ford 7840 View Post
    hi guys i think you might of got your wires crossed, the pump has been off and done up but i can see on the markings on the steel back timing case that the timing of the pump is set on 0 but when things wear and get a a good few hrs on them this might not need to me set to 0 as the must be wear and back lash in the timing gears. all i was wanted to know was witch was to turn the pump to try to get it to pull, i will work all day hard with out never getting hotter than it should but just seems very light on power so rads etc all ok,
    Have to be honest and say I''m pretty sure I've never taken a pump off a 40 series, but even without seeing it, could the markings be for another model in the range that may use those marks? I'm pretty sure that Ford would still of been fitting the pump and then setting timing by the flywheel marks using the pump gear bolts loose and therby take up any slack/wear providing you keep it turning in the direction of rotation??
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    Re: ford 8340 injector pump timing

    the gear is keyed onto the pump shaft on a 40 series & you do rotate the pump body to alter pump timing if pump has been recond you shouldnt have too alter set it too 0

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    Re: ford 8340 injector pump timing

    is it a turbo 8340 if it is should leave 7840 standing ,needs more fuel not altering timing . Ive just changed a pump on a 7740 so pretty familiar with the set up

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    Re: ford 8340 injector pump timing

    Quote Originally Posted by barth 140 View Post
    is it a turbo 8340 if it is should leave 7840 standing ,needs more fuel not altering timing . Ive just changed a pump on a 7740 so pretty familiar with the set up
    I think the op had the pump off hence asking about timing.

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    Senior Member ford 7840's Avatar
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    Re: ford 8340 injector pump timing

    Quote Originally Posted by barth 140 View Post
    the gear is keyed onto the pump shaft on a 40 series & you do rotate the pump body to alter pump timing if pump has been recond you shouldnt have too alter set it too 0
    yes you are 100% correct in what your saying, this is what i was trying to get at but the others couldn't seem to get it, the pump is set onto 0 but is wont put as well as a 6640, hence i asked if any body knew if i needed to more it up or down, shes getting plenty of fuel as she chuck a bit of black out the pipe but soon as it hits a hill game over it just dies so i was thinking of moving the pump to see if it would help as it is a high hour tractor so must be wear in timing gears ect that need to be adjusted on the pump

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    Re: ford 8340 injector pump timing

    Curious if you fixed the lack of power on the 8340, if so, how? I have one with the same issue.

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    Re: ford 8340 injector pump timing

    X-ford/new holland i have worked on these since day one,first has power loss been gradual or was it like this after purchase,these i would say are one of the best engine's ford produced,timing should be as other's have stated set to zero never had one yet that needed alteration for wear, was the inj pump done because of lack of power,did the injector's get done as well,did inj people know about these pumps,if power loss the same after pump done then look else where,when changing the fuel filter can the primer button get the fuel up quickly or do you have to fill the filter first if so fit new primer ,remove the fuel pipe from the brass shutoff tap on pre-filter bowl and remove tap is it blocked any dirt will stick in tap and not go into glass bowl, how many hours has it done,are the air cleaner element's clean or do they get soot on them if so the small flap valve in the pipe going to the exhaust silencer is faulty [new air cleaner required]when starting back pressure from exhaust shut's valve then suction from the exhaust gases open's flap valve sucking any debris from the air cleaner as temp fix short piece of hose between cleaner pipe and silencer can be removed and blanked off , it may be worth while getting a dyno check done if all thing's have been checked as engine may just be getting tired early one's did have a blow-by problem and ring's got changed,is engine using oil or is turbo pipe [inside]oily [turbo],hope this help's.

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