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Thread: accidently turning injector pump backwards :(

  1. #1
    manx674
    Guest

    Exclamation accidently turning injector pump backwards :(

    International engine D-310 in a 885, i'll own up , i was resetting the injector pump timing as it was way out and did'nt want to strip all the timing covers/ rad etc off again, so i though i would do it through the adjustment rectangle, i removed the three bolts and big centre nut then i prised pof the centre piece that contects cog to shaft, i moved engine rnd the correctway till timming mark on fr pulley was aligned with pointer and decide to rotate the injector pump the correct direction by winding back on the centre nut, this was ok , i got pump line on pointer , then when i went to remove nut to put centre back , the whole pump shaft sprung backwards quite quickly, , i got nut off eventually, and all back together timed up, but now i don't have any fuel coming out of injector pipes, any ideas???? , i'm worried i may of damaged injector pump, as all my manuals say only turn pump in corrected direction, but don't say what happens if u go backwards, help

  2. #2
    Orcadian
    Guest

    Re: accidently turning injector pump backwards :(

    Cant say for sure but think there is a carbon vane type pump that puts the main pump under the correct operating pressure, if the pump is turned backwards there is a chance these vanes break,we once had a MF185 that stalled climbing the silage pit and was forced to turn engine backwards, ever after that the engine lacked grunt untill it had over 1400 revs.
    This was on a CAV pump

  3. #3
    Right-arm fast
    Guest

    Re: accidently turning injector pump backwards :(

    You have bleed it so copius amounts of diesel come out of both bleed screws on the inj pump? (is it a Lucas CAV DPS or DPA inj pump ?)

  4. #4
    cyrush
    Guest

    Re: accidently turning injector pump backwards :(

    i would hazard a guess you may have damaged the cam ring which gives the high pressure pistons their pumping action, it is designed to run in one direction only ????

  5. #5
    Cowabunga
    Guest

    Re: accidently turning injector pump backwards :(

    If it is a DPA rotary pump I can vouch for the fact that it will [unhappily] turn backwards.
    I had a JD 2140 on a Keenan-type West mixer wagon for a few years. In certain conditions that wagon was prone to stall the unmanned tractor. When that happened and due to the unusual design of PTO engagement, which disengaged when the engine stopped, the engine compression kicked it back and the engine [and hence pump] would run in reverse, blowing exhaust out of the aircleaner and pulling air in through the exhaust, until the loader driver [often me] ran over to stall it properly.

    The only damage it ever did was to leak diesel from the mid-line gasket on the DPA pump. The engine is still running like a watch with over 10,000 hours.

  6. #6
    davidroberts30
    Guest

    Re: accidently turning injector pump backwards :(

    Quote Originally Posted by Cowabunga View Post
    If it is a DPA rotary pump I can vouch for the fact that it will [unhappily] turn backwards.
    I had a JD 2140 on a Keenan-type West mixer wagon for a few years. In certain conditions that wagon was prone to stall the unmanned tractor. When that happened and due to the unusual design of PTO engagement, which disengaged when the engine stopped, the engine compression kicked it back and the engine [and hence pump] would run in reverse, blowing exhaust out of the aircleaner and pulling air in through the exhaust, until the loader driver [often me] ran over to stall it properly.

    The only damage it ever did was to leak diesel from the mid-line gasket on the DPA pump. The engine is still running like a watch with over 10,000 hours.
    zetors will run backwards too(motorpal pump)

  7. #7
    manx674
    Guest

    Re: accidently turning injector pump backwards :(

    its a bosch CV rotary pump, i've been speeking to some diesl/ pump specialist and with this type of pump it is ok to go backwards, done a few experiments and it is defo the pump, no high pressure out the back, just seems to pump back to tank via excess fuel pipe, , just trying to find someone local to help sort it out, the engine/ pump has been sitting for a while, so i may have woken up / split seals etc,

  8. #8
    manx674
    Guest

    Re: accidently turning injector pump backwards :(

    might be out of the woods, mate has a spare pump from a 955, , they were fitted with a D-310 engine as well,

  9. #9
    Right-arm fast
    Guest

    Re: accidently turning injector pump backwards :(

    Quote Originally Posted by manx674 View Post
    its a bosch CV rotary pump, i've been speeking to some diesl/ pump specialist and with this type of pump it is ok to go backwards, done a few experiments and it is defo the pump, no high pressure out the back, just seems to pump back to tank via excess fuel pipe, , just trying to find someone local to help sort it out, the engine/ pump has been sitting for a while, so i may have woken up / split seals etc,
    TBH i dont thinking turning either pump backwards as you did will do harm at all. I thought these engines had bosch VA pumps - an earlier version of the VE with hydraulic governors. With these you remove the window on the side and turn turn the pump on its slotted holes to line up the relevant timing line a bit like the cav pumps, unlike the ve where you measure the plunger travel with a dti to correspond with the crank pulley timing marks. Its a bit of a mystery why you suddenly have no fuel to the injection lines if it was ok before.

  10. #10
    brynseiri
    Guest

    Re: accidently turning injector pump backwards :(

    Dont they turn round the oposite way south of the Equator?

  11. #11
    manx674
    Guest

    Re: accidently turning injector pump backwards :(

    mates 955 pump did the trick , , , not sure what was up with old pump, might get it looked at if money allows, can't harm having a spare pump,

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