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Old 25-02-2010, 06:31   #1
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Location: Pompano Beach, FL
Boat: Pearson, P33, 33', Stampede
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2GM20F Water Heater / Heat Exchanger

I am about to refit with a new heat exchange water heater. Does anyone know what size and thread the hose barbs need to be on a 2GM20F motor?
I have had 2 local shops tell me they are 3/8 but you need to tap the holes first, I would prefer to buy the metric size that fits and not tap out the pump housing. Yanmar has a kit but it is $80 for 2 plugs and well money is tight so I need to look at options.
Any ideas?
I am located in Ft. Lauderdale if anyone knows a good place to go.
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Old 26-02-2010, 06:17   #2
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Surge Tank

My water heater is also going to be slightly higher than the motor. Do I need a surge tank? I don't understand the purpose since the water heater is a small closed circuit.
Can anyone enlighten me?
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Old 26-02-2010, 08:05   #3
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IIRC, it's 3/8" pipe thread. You'll need to remove 2 allen head plugs
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