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  1. N

    PCM gt40 runs hot

    Blockage found! This is inside the thermostat housing itself. I have a rat-tail file inserted from where the raw water enters the housing adjacent to the thermostat. At first I couldn't fit a small screwdriver through this portion where it joins the main water channel as it was 80%+ blocked...
  2. N

    PCM gt40 runs hot

    Well the transmission oil cooler was clean as a whistle though I was hoping it would be clogged. I boat exclusively on a very weedy lake, but the raw water strainer is apparently doing its job well. On to the main water pump......
  3. N

    PCM gt40 runs hot

    I came across this thread as I too have a PCM GT40 (351W) running hot. Any help appreciated, especially if Danielm resolved his similar issue. I have a new 160 degree thermostat. Engine warms up normally to 160 then continues to slowly creep up to 185-ish. If I rev approx 1100-1200 rpm in...
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