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CAT 3114T Engine 80 HP year 1989 wants to stall after engine starts

Discussion in 'Shop Talk' started by lake side bob, Apr 1, 2018.

  1. lake side bob

    lake side bob Well-Known Member

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    Wondering if anyone here has ideas of what would cause the CAT 3114T engine to want to stall .
    Engine is in CAT wheel loader.
    I start the engine let it warm up a few minutes then put transmission into forward 1st gear, with in 50 feet the engine bogs down as if it was going to stall.
    The engine can run for one hour and some times it will do this again in either 1st or 2nd gear.
    Oil samples show nothing wrong with engine, just turned over to 7,000 hours.
    Transmission fluid sample shows no problem.
    Fuel filters changed.
    Air cleaner clean.
    When this happens if I step on the accelerator pedal to rev up the engine it does not rev up as one would expect so I take foot off and engine slows down then depress it again and work with it (while it still wants to bog down), after a few minutes problem does go a way and then some times it happens again.
    Any ideas of what is the cause?
     
  2. ETER

    ETER Well-Known Member

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    Sounds like you might be pulling air... I would put a clear line between the pump and supply and look for air inundation.
    Regards Bob
     
  3. Howey75

    Howey75 Active Member

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    Or sumthin floating around in the fuel tank...
     
  4. Jonas302

    Jonas302 Senior Member

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    Did you clean the prescreen water trap if it has one?
     
  5. lake side bob

    lake side bob Well-Known Member

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    I do not think it has one, I will look.
     
  6. lake side bob

    lake side bob Well-Known Member

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    I don't follow what are you making reference to?
     
  7. Theweldor

    Theweldor Senior Member

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    I have taken everything from a rag, to a soda bottle cap, to a piece of grade stake out of fuel tanks already. God only knows how they got in there when the snap rings and strainers were still in place.
     
    63 caveman likes this.
  8. Delmer

    Delmer Senior Member

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    If it's not air getting sucked in, then it's air getting in after the transfer pump so you might try the clear hose on the fuel return line if the supply looks clear with no air bubbles. Another test to narrow it down is to tee in a line to a pressure vacuum gauge in the cab to see what the pressure does when it bogs down.

    Assuming you're not getting black smoke or any smoke when it's failing to rev.
     
  9. Howey75

    Howey75 Active Member

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    Some times foreign objects will get sucked up against the fuel strainer in the tank and cause loss off fuel flow and bogging at random times.Missed the part where you said it goes away.Sorry.Usually the suction will hold the offending material there until the engine is shut down so may not be your problem unless it recovers when load is decreased.
     
  10. lake side bob

    lake side bob Well-Known Member

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    MAY BE some thing is wrong with the fuel injectors??? Any thoughts???
     
  11. Delmer

    Delmer Senior Member

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    possibly one is sticking open letting compression pressure bleed back to the fuel line. The clear tubing is the easiest way to find out.

    Not that likely. What's the history on this thing? you getting any black smoke, or white smoke when it's bogging?
     
  12. lake side bob

    lake side bob Well-Known Member

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    No black smoke or white smoke.
    We do not rev the engine up much normally only about middle RPM range when working.
    Could water condensation in the fuel tank cause this, but it does not last it will stop acting up after a while then all of a sudden begin acting up.
     
  13. Jonas302

    Jonas302 Senior Member

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    Were you able to find the pre strainer be in a canister under the fuel primer pump
    Let us know what loader your working on
     
  14. lake side bob

    lake side bob Well-Known Member

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    Pre strainer screen. I will have to look in the books for the machine to locate it.
    I have looked in the at the location under the primer pump for a small screen in the fuel line it is not there.
     
  15. Delmer

    Delmer Senior Member

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    Maybe, but the fuel filter would be full of water for it to happen. It would blow plenty of white smoke if it was water.
     
  16. lake side bob

    lake side bob Well-Known Member

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    the loader is a CAT 910E model 19689 year with 6700 hours on engine and frame.
     
  17. lake side bob

    lake side bob Well-Known Member

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    The fuel filter had no water in it, that I could determine when it was changed out.
     
  18. lake side bob

    lake side bob Well-Known Member

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    That is a 1989 year.
     
  19. Jonas302

    Jonas302 Senior Member

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    c518705.gif





    Number 25 is the the prescreen water separator its a washable filter if it hasn't been out you might be surprised whats in there 15/16 wrench on the top bolt to remove
     
  20. lake side bob

    lake side bob Well-Known Member

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    I have replaced that several years ago.
    I Will check it in the next couple of days..