overpressure valve help
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overpressure valve help

  1. #1
    Senior Member 74glencoe's Avatar
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    Default overpressure valve help

    Everything is back together after new intake gaskets, and held 5 lbs of water pressure for thirty min.
    I added a few gauges, the clear 1/8 line from intake runner goes to vacum guage, the gauge you can see the face of is water pressure tapped from the water crossover. I turned the guage towards the rear so that I could read it while setting the overpressure valve.

    This is how I tried to test/set the new overpressure valve (it wont stay like this, just the only way I could test it on the boat while not at the lake). The water comes in from the garden hose, passes through the galvanized tee, and proceeds to the engine, one leg of the tee leads to the overpressure valve.


    Anyway I found that with water freely running through the block the water pressure guage just barely moves off zero, when I block off one dumps from the block with my finger I can create pressure enough to move the guage to about seven pounds. I then set the valve to start dumping at five pounds pressure. I fugured I had it at that point, but when partially block off both dumps from the block the dump valve opens but the pressure on the guage rises past ten, So what am I doing wrong????
    Boating is nothing like cocaine, boating is much more addictive and results in bigger parties!

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    Boat Nut sleekcrafter's Avatar
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    if running off the tap, the water pressure can be 30 or more psi. Further restriction will cause pressure to rise. Cap the hose prior to entering the engine, then set the regulator to your 5 pounds.
    Upper Midwest Power Boat Association
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  4. #3
    Senior Member 74glencoe's Avatar
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    Quote Originally Posted by sleekcrafter View Post
    if running off the tap, the water pressure can be 30 or more psi. Further restriction will cause pressure to rise. Cap the hose prior to entering the engine, then set the regulator to your 5 pounds.

    Makes sense, will do sleek.
    Boating is nothing like cocaine, boating is much more addictive and results in bigger parties!

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    Senior Member Fonz69's Avatar
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    What size hose out of your (overpressure) valve?

    It needs to be larger then your other lines or it wont work right

  7. #5
    Senior Member 74glencoe's Avatar
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    Quote Originally Posted by Fonz69 View Post
    What size hose out of your (overpressure) valve?

    It needs to be larger then your other lines or it wont work right
    copy, It is currently the same size as the line from the jet to the "tee", I will size it up a little.
    Boating is nothing like cocaine, boating is much more addictive and results in bigger parties!

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