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Thread: 290 trim issues

  1. #1

    Default 290 trim issues

    My outdrive will slowly drop to full down while underway. I usually run at a -2 or 3 but lately after being up on plane for 5 minutes or so it will be all the way down to full down (-6 maybe?) What's the usual cause and fix for a hydraulic trim that slowly drops?
    -Robert

  2. #2
    Join Date
    Dec 2006
    Location
    Chaumont Bay, N.y., USA
    Posts
    5,191

    Default Re: 290 trim issues

    Ayuh,..... Either leaky seals in the rams, or leaky valvin' in the pump,....
    Any Grease is Better,... Than No grease at All....

  3. #3
    Join Date
    Mar 2009
    Location
    Portland, Oregon,
    Posts
    9,133

    Default Re: 290 trim issues

    Regarding the cylinder itself, the base end hydraulic fluid volume is larger than that of the stem end hydraulic fluid volume (the stem itself consumes volume).
    If the pump valves are holding, it's pretty tuff for the base end hydraulic fluid volume to find a place to go.
    In other words, it is more likely that your pump valves are not holding.




    .
    Rick ... aka Ricardo..... AQ series Volvo Penta repair
    Portland, Oregon
    28' SDN F/B w/ twin Volvo Penta 5.7L DP's

    Please... no PMs! Post your questions on the forum.

  4. #4

    Default Re: 290 trim issues

    Quote Originally Posted by RicardoMarine View Post
    Regarding the cylinder itself, the base end hydraulic fluid volume is larger than that of the stem end hydraulic fluid volume (the stem itself consumes volume).
    If the pump valves are holding, it's pretty tuff for the base end hydraulic fluid volume to find a place to go.
    In other words, it is more likely that your pump valves are not holding.




    .
    Thanks. How difficult is it to replace the valves?
    Thanks,
    Robert

  5. #5
    Join Date
    Mar 2009
    Location
    Portland, Oregon,
    Posts
    9,133

    Default Re: 290 trim issues

    Quote Originally Posted by Rscottdds View Post
    Thanks. How difficult is it to replace the valves?
    Thanks,
    Robert
    Robert, if a valve or valve seat has debris in it, it will prevent the valve from seating properly, preventing the cylinders from holding trim.
    In many cases the pump valves can be accessed and can be cleaned.


    A correction to my previous post.



    Regarding the cylinder itself, the base end hydraulic fluid volume is larger than that of the stem end hydraulic fluid volume (the stem itself consumes volume).
    If the pump valves are holding, it's pretty tuff for the base end hydraulic fluid volume
    to find it's way through a leaking cylinder piston seal and find a place to go.
    In other words, it is more likely that your pump valves are not holding.





    .
    Rick ... aka Ricardo..... AQ series Volvo Penta repair
    Portland, Oregon
    28' SDN F/B w/ twin Volvo Penta 5.7L DP's

    Please... no PMs! Post your questions on the forum.

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