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  1. #1
    Join Date
    Oct 2007
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    3,143

    Default Volvo Penta SX-A drive trim problem

    when I touch the "trim up" button, the drive trims up, but doesn't stop going up after I've released the trim up button,

    switching the engine / the contact "off" and "on" again stops this trimming up.
    sometimes during navigation, the drive goes up, without touching the button,

    I've opened the buttons in the throttle, and they seem to be clean and OK,
    so something else in the trim pump controll system makes wrong contact

    (only on Port drive, SB is OK)

    anybody has had or knows this problem ?
    many thanks for advice !

    (we crossed some rough seas yesterday, so water ingress somewhere... ?)

  2. #2
    Join Date
    Sep 2005
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    5,343

    Default

    Quote Originally Posted by BartW View Post
    (only on Port drive, SB is OK)
    Could it be a trim relay problem? Have you tried swapping the up/down trim relays to see if the problem transfers to the opposite direction? Or swap both relays from port to starboard?

    Cheers
    Jimmy

  3. #3
    Join Date
    Oct 2007
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    3,143

    Default

    Quote Originally Posted by jimmy_the_builder View Post
    Could it be a trim relay problem? Have you tried swapping the up/down trim relays to see if the problem transfers to the opposite direction? Or swap both relays from port to starboard?

    Cheers
    Jimmy

    but I'm not sure where these realy's are,
    I'm afraid they are in the EVC box, and if thats the case, i'm in deep ****
    as this box is almost unaccesible on the P engine

    trace the electric cables coming from the trim pump, that's the first thing to do,
    Boat is in my warehouse on the trailer, so can have a look and do some test

    thanks !

  4. #4
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    Sep 2005
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    Default

    Quote Originally Posted by BartW View Post
    but I'm not sure where these realy's are,
    I'm afraid they are in the EVC box, and if thats the case, i'm in deep ****
    as this box is almost unaccesible on the P engine

    trace the electric cables coming from the trim pump, that's the first thing to do,
    Boat is in my warehouse on the trailer, so can have a look and do some test

    thanks !
    Hi Bart

    This pic seems to suggest that they are with the trim pump (#5 is the relay assembly):



    I've had probs with the trim relays on my dph legs; on my, the relay housing had cracked and there was a bit of corrosion. Very easy to change. Note that the way that VP wire the relays up, you need them both to be installed for the leg to trim at all.

    Cheers
    Jimmy

  5. #5
    Join Date
    Oct 2007
    Posts
    3,143

    Default

    the SX drive is completely different Jimmy,
    but thanks nevertheless.

    have looked at it today,
    and unfortunotly now all is working normal ofcause,

    would like to sort out the functioning in case I have the problem again,
    and I'm afraid on a SX drive the only parts are:

    the switches in the throttle
    The EVC box (with software programmed Min/Max trim detection)
    The trim pump which is on the OUTSIDE of the transom shield
    The wiring

    and all these parts have very difficult acces in the Karnic

  6. #6
    Join Date
    Sep 2005
    Posts
    5,343

    Default

    Hi Bart, sorry about the duff info, Marine Parts Europe show that diagram as the exploded diagram for the SX-SLT. I assumed the SX bit made it relevant to you - sorry about that.

    Cheers
    Jimmy

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