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I recently took my boat and her new MM Exchange engine and FWC system out for sea trials. During the first run I immediately found the engine to be running too hot - in excess of 200 at times. I got good discharge from the exhaust and throughout the system.
On the second run, I experienced the same high temps until the heat exchanger expansion tube ruptured. Prior to this I also noticed a squeaking noise - FWC pump belt slippage.
After allowing the engine to cool, I checked the tension on the belt and re-adjusted. Replaced the expansion tubing and started the engine. Immediately noticed the water pump pulley backing off the shaft so I shut down the engine. The pin holding the FWC pump pulley lacks a locking key like the PTO pulley has and was slippling. Unable to reliably attach it, I bypassed the FWC system altogether.
Engine continued to run very hot until I adjusted the bypass valve between the block T and thermostat. Once adjusted I got the engine to the desired temperature.
2 Questions - has anyone else with the MM FWC kit experienced a problem with the water pump pulley? Secondly - could the brand new thermostat on the new MM exchange engine be malfunctioning since it doesn't seem to be opening to direct enough coolant to the block.
On the second run, I experienced the same high temps until the heat exchanger expansion tube ruptured. Prior to this I also noticed a squeaking noise - FWC pump belt slippage.
After allowing the engine to cool, I checked the tension on the belt and re-adjusted. Replaced the expansion tubing and started the engine. Immediately noticed the water pump pulley backing off the shaft so I shut down the engine. The pin holding the FWC pump pulley lacks a locking key like the PTO pulley has and was slippling. Unable to reliably attach it, I bypassed the FWC system altogether.
Engine continued to run very hot until I adjusted the bypass valve between the block T and thermostat. Once adjusted I got the engine to the desired temperature.
2 Questions - has anyone else with the MM FWC kit experienced a problem with the water pump pulley? Secondly - could the brand new thermostat on the new MM exchange engine be malfunctioning since it doesn't seem to be opening to direct enough coolant to the block.