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Recent content by Kingfish22

  1. K

    1998 Mercury 150XL - Heat

    I've been battling this for a while now... any advice would be gratefully appreciated! Problem: Not enough water pressure (doesn’t get any higher than 12 psi on the gauge even at WOT) and boat runs at 200 degrees when mid to WOT. I have both temp and pressure gauges. Alarm has not gone off...
  2. K

    1998 Mercury 150XL - Heat

    I've been battling this for a while now... any advice would be gratefully appreciated! Problem: Not enough water pressure (doesn’t get any higher than 12 psi on the gauge even at WOT) and boat runs at 200 degrees when mid to WOT. I have both temp and pressure gauges. Alarm has not gone off...
  3. K

    Installing a Water Pressure Gauge on 1998 150 XL

    I have a 1998 150 XL Merc. and have been trying to install a water pressure gauge with no success. There does not appear to be any dedicated port for a such fitting into the cylinder head. I ended up tee'ing it into the tell tale tubing but I get no pressure reading whatsoever. I would love to...
  4. K

    1998 Merc 150 XL. Having alarm issues (temp)

    Help! I have a 1998 Merc 150 XL. Having alarm issue. Must be temp since I've pulled the oil injection and mix my fuel/oil in tank. I replaced the thermostats, new water pump, replaced poppet valve -- just now replaced the temp. sensor, but still getting the alarm... Engine has a good stream...
  5. K

    Merc. 150 Alarm Issue at high speed

    galamb, I think you might right on this. I went down to the boat to see where the poppet valve was located. Going to order the part and replace. Hopefully it will solve my issue. It appears I will need to remove the lower cowl on the engine. Pretty easy process? Can't seem to locate any...
  6. K

    Merc. 150 Alarm Issue at high speed

    Hoping to get some help as I'm new to this forum as well as the engine! I have recently purchased a 1998 Mercury 150 Outboard (Offshore). I have a long (continuous) alarm that will go off after running the boat at 3 /4 – full throttle for longer than 5-10 minutes. I can run the boat at low...
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