Injection Pump Govenor

Discussion in 'Diesel Engines' started by Paul F, Oct 9, 2011.

  1. Paul F
    Joined: Sep 2011
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    Paul F Junior Member

    Hi All,

    Can anyone please explain how the GOVENOR part of the injection pump works, and what it does to control the engine ?

    Regards, Paul
     
  2. gonzo
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    gonzo Senior Member

    It controls fuel flow to keep RPM's constant. Mechanical systems work with centrifugal weights, electronic systems work with a sensor.
     
  3. Paul F
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    Paul F Junior Member

    Thanks Gonzo, so does the " throttle " leaver increase fuel flow or does it control speed of the govenor.
     
  4. gonzo
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    gonzo Senior Member

    It controls the governor. Think of it as a cruise control in a car.
     
  5. Paul F
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    Paul F Junior Member

    That's obviously why it is easier to maintain constant RPM in a diesel engine when compared to a petrol, particularly with a carb.
     
  6. michael pierzga
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    michael pierzga Senior Member

    The govenor also keep a diesel engine from running out of control.
     
  7. Paul F
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    Paul F Junior Member

    Ah, so it controls and LIMITS the RPM, hence the name " govenor " to govern the revs.

    Thanks, I'm learning more. I'm just trying to make sure that with proper use my engine will give me many hours / years service.

    Regards, Paul
     
  8. FAST FRED
    Joined: Oct 2002
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    FAST FRED Senior Member

    There are two types of units .

    One will attempt to keep the RPM the operator set.

    The other limits the HP (fuel flow) to the set point and will allow the RPM to drop under load.
     
  9. michael pierzga
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    michael pierzga Senior Member

    Yes indeed...two types, functions for a govenor. One chokes off fuel supply, the other regulates it.
     
  10. powerabout
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    powerabout Senior Member

    Not quite there are constant speed governers - gen sets etc
    and variable speed like cars trucks and propulsion engines
     
  11. CatBuilder

    CatBuilder Previous Member

    Where does one find a variable speed governor for a Yanmar 3YM30 engine?

    That would be the type that you set at say, 1800 RPM to run a generator.
     
  12. powerabout
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    powerabout Senior Member

    gen set needs a constant speed governer
    EDIT ones that holds the engine at a constant speed
     
  13. CatBuilder

    CatBuilder Previous Member

    No....

    Link

    "The variable speed mechanical governor is found extensively on industrial and marine applications, since it is designed for the following functions:

    Controls the engine idle speed
    Controls the maximum engine speed hydraulic-type governors (industrial and generator sets)
    Holds the engine speed at any position between idle and maximum as desired and set by the operator."

    Any idea where to buy one for a Yanmar 3YM30?
     
  14. powerabout
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    powerabout Senior Member

    ok its a terminology thing
    you buy a variable speed governor to hold the engine at constant speed with very little droop

    and a constant speed supplies constant fuel supply so load increases and the engine slows down

    my bad
     

  15. powerabout
    Joined: Nov 2007
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    powerabout Senior Member

    If its internal jerk pump style then it would be yanmar, its its external inline or rotary you could speak with the pump manufacturer
    so how about we just say you want a governor with only a few percent droop
    Looks like the Yam has en external inline pump so start with the pump manufacturer
     
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