Perkins 4-108 and Velvet drive trans problem

Discussion in 'Propulsion' started by morgansailor, Sep 11, 2010.

  1. morgansailor
    Joined: Sep 2010
    Posts: 1
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Florida

    morgansailor New Member

    My engine dies as soon as I shift into Neutral/Reverse from Forward (after the engine has come to operating temperature). I have checked cable connections, fluid level, and fluid quality (no water, etc). Any ideas would be greatly appreciated. Thanks.
  2. Chuck Losness
    Joined: Apr 2008
    Posts: 350
    Likes: 48, Points: 28, Legacy Rep: 135
    Location: Central CA

    Chuck Losness Senior Member

    Sounds to me like you have a problem with the governor on the injection pump. I have a 4108 in my gulfstar 37 and have noticed at times that the engine rpm momentarily decreases when I shift from forward into neutral and then comes back up to normal rpm. Hope this helps.
  3. mydauphin
    Joined: Apr 2007
    Posts: 2,161
    Likes: 53, Points: 48, Legacy Rep: 575
    Location: Florida

    mydauphin Senior Member

    I dont know this setup in particular but some shifter have some kind of microswitch that turns off either ignition in gas engines or fuel in diesels momentarily to allow easier shifting. Or your engine could a mechanical version of this. Try raising idle speed and see if problem continues.

  4. gonzo
    Joined: Aug 2002
    Posts: 16,652
    Likes: 1,615, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    VelvetDrives don't need a shift interrupt switch. It could've been fitted anyway though. The transmission may be shifting into forward and reverse at the same time and locking.
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