Click for Ocean Alexander Click for Glendinning Click for Furuno Click for Walker Click for Perko

oil level Going up in transmission

Discussion in 'Engines' started by anchorsaway, May 29, 2024.

You need to be registered and signed in to view this content.
  1. anchorsaway, May 29, 2024
    #1
    anchorsaway

    anchorsaway New Member

    Joined:
    Mar 22, 2021
    Messages:
    6
    Location:
    michigan
    I have Detroit 871s my gearboxes oil level is increasing what would cause that
  2. RER, May 29, 2024
    #2
    RER

    RER Senior Member

    Joined:
    Jan 20, 2009
    Messages:
    1,585
    Location:
    Newport Beach CA
    Discolored also? Main seal failure. Both gears? Failing at the same time would be a bit odd. Maybe it's been going on for a while.
  3. anchorsaway, May 29, 2024
    #3
    anchorsaway

    anchorsaway New Member

    Joined:
    Mar 22, 2021
    Messages:
    6
    Location:
    michigan
    The fluid is still clear
  4. Capt Ralph, May 29, 2024
    #4
    Capt Ralph

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
    Messages:
    13,444
    Location:
    Satsuma, FL
    Detroit and Allison clutch/gear?
    Your engine oil is going down also.
    There is a seal between the front of the wet clutch and crankshaft end that is failing.

    TD or ZF clutch/gear? Review your level checking procedure.

    Still not; Send some oil to a lab quickly for testing. Looking for water or coolant.
  5. DOCKMASTER, May 29, 2024
    #5
    DOCKMASTER

    DOCKMASTER Senior Member

    Joined:
    Feb 26, 2012
    Messages:
    1,498
    Location:
    Ketchikan, Alaska
    My first suspicion would be your gear oil cooler. You may be getting water into the oil via a failed tube or similar issue in the cooler.
  6. Pascal, May 29, 2024
    #6
    Pascal

    Pascal Senior Member

    Joined:
    Feb 29, 2008
    Messages:
    8,546
    Location:
    Miami, FL
    Oil would be milky. May take while for engine oil to affect the gear oil color
  7. RER, May 29, 2024
    #7
    RER

    RER Senior Member

    Joined:
    Jan 20, 2009
    Messages:
    1,585
    Location:
    Newport Beach CA
    I assume you're checking the gear oil with the engines running. Without engines running the level could show way up on the stick above the full marks.