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  1. #1
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    1987 Chris Craft 415 Stinger
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    Trim Pump or Trim Cylinder

    How can I tell whats leaking off.I have a drive thats falling down after a few hours moves a few inches. after a day or two almost all the way down. TRS cylinders and pumps

  2. #2
    Platinum Member Platinum Member picklenjim's Avatar
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    83' Nordic 23' Viking 505 BBC TRS Drive
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    Well I can tell ya the poor man's way to test this with out useing all the gauges and such. Go to the auto parts store and get some 3/16" brass plugs. Lift the drive all the way up. Now put something under it that will hold it up. Remove the lines where they connect to the cylinders. Install the brass plugs into the cylinders. Remove what ever you have holding it up. Let it sit a day or so and see if it drops. You can remove the plugs from one cylinder at a time and let it sit to determine which one may have a leak. Be carefull and DO NOT REMOVE PLUGS FROM BOTH CYLINDERS AT THE SAME TIME WITH THE DRIVE UP. It WILL drop quickly.

    Do you have the old style where both lines connect into the fore end of the cylinders or does yours have a line running up the outside of the cylinder?

  3. #3
    Platinum Member Platinum Member mike tkach's Avatar
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    31 american offshore,38 fountain fever
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    Quote Originally Posted by redcorvetteman3 View Post
    How can I tell whats leaking off.I have a drive thats falling down after a few hours moves a few inches. after a day or two almost all the way down. TRS cylinders and pumps
    its usually the check valves in the trim pump,that was my problem,i replaced the trim pump,problem solved.
    MIKE TKACH

  4. #4
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    1987 Chris Craft 415 Stinger
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    I have the lines at the front of the cyl. with the plug method wouldnt that be the same as taking the line looping around to the otherport on the same cyl. Seems like both cyl. would have to be leaking off for the drive to drop? I would think that unlikely, but I would think only one check valve is this right?Can I service that?


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