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| − | I've followed this discussion with great interested because I was experiencing the same "mystery" problem.
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| − | I changed all the hoses on both sides of the Oberdorfer Raw Water Pump from the intake through-hull to the mixing elbow on the exhaust system. I rerouted the intake hose to the front of the engine (to shorten the distance of the run) as someone suggested, and still experienced the problem with failing to have water coming out the exhaust at random times.
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| − | BOTTOM LINE MYSTERY SOLVED: The cover plate on the Oberdorfer Raw Water pump showed "circular wear groves" and this caused the pump to fail to pick up or prime itself at engine startup. The front edge of the impeller must make a tight seal to the cover plate in order to create suction and the ability to prime and pump water. I replaced the pump with a new one and the problem has not reoccurred.
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| − | What I've learned is that the raw water pump on the M25 in the 1987 Catalina 34 sits a few inches above the water line of the boat. This is easily determined by disconnecting the water line from the pump and when held at the same level as the fitting on the pump no water came out. When the hose is lowered a few inches I could see water starting to appear in the hose. When lowered below the water line water will overflow the hose.
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| − | This essentially means that the pump must prime itself every time the engine is cranked. I wonder how many C34 owners think that the raw water pump on the engine is below the water level - as did I?
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| − | I plan to resurface the face plate on the old Oberdorfer Raw Water Pump and keep it on board as a spare.
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