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  1. Randy99

    water pressure fluctuates on 89 Merc 150hp black max...is it Normal?

    So when running on the lake at 3200 rpm the pressure reads 6-7 PSI and then when I reach 4000 and beyond rpm I see about 13-14 psi. Is the lower rpm normal for the given water pressure or should it be higher? Poppet valve perhaps? Thanks much!
  2. Randy99

    Poppet valve question on a 1989 150 black max Merc.

    I recently purchased a ranger bass boat and am trying to learn all the things about the merc motor on it. So I found my poppet valve location and noticed that the smaller hole on the left is plugged and has no housing over it but the larger hole to the right has the housing over it, which is...
  3. Randy99

    Installed new water pressure gauge with T fitting but no pressure at WOT.

    Hi, Hoping you can help me with my water pressure gauge. I have a 1989 Mercury 150hp black max. I followed the hose that goes between the two thermostats then down the block to a tee which has two smaller hoses one going to a 90 into the block and the other side goes to the pee hole. I...
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