1HD odd noise

Discussion in 'Diesel Tech / 24 volts' started by Loober, Dec 7, 2018.

  1. Loober

    Loober

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    These could be the worst kind of problems to diagnose especially over the internet, but here goes. My 1HDFT began making an odd noise, best way to describe is an electric motor kind of whine, not a knock. It would get louder with RPMs to where it felt something was about to blow up. Truck ran normal, no power loss, or smoke. At idle its barely noticeable. In the driveway using a rudimentary stethoscope with a heater hose I was able to narrow it down to the injector pump area, which is the only thing that hasn't been rebuilt on the motor. Took it out and had a reputable shop look it over, and determined there was nothing wrong with it, shaft is solid, seal is tight, etc.

    Continued to take the timing cover off hoping it was the injection gear bearing, upon initial inspection it feels tight and spins freely, no noticeable wear marks anywhere on the cover or the other gears. The bearing does have some slight noticeable run out when spun by hand, can someone comment if that is normal.

    To note, I did check for the noise at other parts of the motor, nothing on the exhaust side, took the valve cover off, that was normal, for sure would hear it then if it was from the bottom end or valve train.

    At a loss, hate to put it all back together with no resolution

    Thanks
     
  2. GTSSportCoupe

    GTSSportCoupe

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    Just a shot in the dark, but the starter solenoid is not getting stuck is it?
     
  3. roscoFJ73

    roscoFJ73

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    How many klms on the injection pump? I haven't checked but I would have thought the shaft should not move because at the other end is some fairly high precision parts like the plunger
     
  4. ForealBoreal

    ForealBoreal Cummins Boostin SILVER Star

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    My original modded ve pump before it crapped the bed made a motor whine sound before it grenaded.

    Easy test, between your injection lines on the head of the pump there is a 12mm bolt. Unscrew that (fuel will come pouring out) check to see if metal filings are on that. I forget where there is also a screen I checked on my pump to diagnose it was actually the pump. Someone I’m sure can chime in.
     
  5. ForealBoreal

    ForealBoreal Cummins Boostin SILVER Star

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    Also in terms of turning the pump over there is a bit of resistance as there is a cam in there. Thats normal from what I’ve seen taking an injection pump on and off 3 times.
     
  6. Loober

    Loober

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    @ForealBoreal are you referring to the bolt that you would take off to time it?
     
  7. ForealBoreal

    ForealBoreal Cummins Boostin SILVER Star

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    Yes exactly. It’s a quick and easy
    Vac pump maybe?
    It sounds like something that’s moving at all times. PS pump? Does it get louder when you turn?
     
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