allison 545 myserious oil leak

Discussion in 'Class A / Diesel Pushers' started by wookie, Jul 13, 2010.

  1. wookie

    wookie New Member

    trans oil leal only happens when truck is moving. sitting idling or in gear-no leak! changed trans lines and put in new pan gasket(twice). cant find leak! its bad too. about 4 litres per day.any one had this experience. The dealer wants to put in a new trans. :(
     
  2. dbarton291

    dbarton291 Senior Member

    RE: allison 545 myserious oil leak

    Is this a gasoline engine?

    Is there any evidence of transmission fluid under, or on the underside of the vehicle?
     
  3. SuperMike

    SuperMike Member

    RE: allison 545 myserious oil leak



    Surely there must be evidence of a leak. 4 Lires is getting on for a gallon, that would make one hell of a mess.
     
  4. H2H1

    H2H1 Senior Member

    Re: allison 545 myserious oil leak

    WELL I DESCRIBE it as changing the fluid every day you drive it :laugh: :laugh: :laugh:
     
  5. dbarton291

    dbarton291 Senior Member

    RE: allison 545 myserious oil leak

    Unless it's a gas engine and the vacuum modulator has a broken diaphragm. The oil gets sucked up the vacuum line and burned in the engine.
     
  6. SuperMike

    SuperMike Member

    RE: allison 545 myserious oil leak

    Well,I learn something every day.

    However would you not then have a smokey exhaust ?
     
  7. dbarton291

    dbarton291 Senior Member

    RE: allison 545 myserious oil leak

    It may, particularly on deceleration when gas engine vacuum is high. It will be white smoke usually.
     
  8. C Nash

    C Nash Senior Member

    Re: allison 545 myserious oil leak

    If the undercarriage is not oiled all over it has to be sucked back through the engine. I would think this amount you should be able to see white smoke with a little blue tint to it. Let us know what you find.
     
  9. dbarton291

    dbarton291 Senior Member

    Re: allison 545 myserious oil leak

    If it's a diesel, is there a PTO on it? Could be leaking through the PTO cover gasket or elsewhere in a PTO system. ATs will also spew at highway speed out the breather if they are overfilled with oil. If it's diesel, I would check the PTO system, or cover gasket, and the calibration of the dipstick.
     

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