A few weeks ago we went out on our boat and the temperature sensor warning buzzer started to sound intermittently. We stopped the boat and had a day out at the beach and then on the way home from the beach we went to go up on the plane and the sensor buzzer continuously sounded and we noticed the temperature was up around 200deg. We shut the motor down and got towed back to the ramp so that we could avoid any further damage. When we got the boat home we flushed it on the muffs and noticed that the amount of water it was sucking in was less than usual. We took the boat to a mechanic who changed the temperature sensor and the thermostat. He claimed it was then running normally but wasn't sure and so we took the boat and tested it again in the water. Again the boat overheated after only having gone out about 100metres on about 4knots. We had the alarm going off again too. We stopped the engine immediately and returned to the mechanic. This time he suggested changing the water pump housing as it was scored and the impellor he also inspected the risers and thought that they looked alright. He changed the housing on the water pump and the impellor and left the risers as they were. Again we took the boat out to see if the problem was fixed but the boat is still running hot on idle. Each time we rev the motor the temperature seems to reduce almost to normal operating temperature. On the plane it appears to be running only slightly above its normal temperature but it feels like it is running a bit rough. All through this, the amount of water that is being taken in when on the muffs seems reduced. We are suspecting a blockage of some type but don't really know how to proceed and have already spent over $2000 trying to work it out. Any ideas or help would be much appreciated.
Scott.
Scott.
