1987 H28.5 / Yanmar 2GM20F Motored a solid 11 hours at 2800 rpms couple months ago without incident and put it in its slip where it remained till yesterday. Motored out of the harbor about 10 minutes and then sailed about 2-3 hours. Coming back into the harbor, started the engine and within about 2-3 minutes the high temp alarm sounded. Today, I found the coolant completely full, the raw water strainer slightly dirty, but not near enough to cause problem. The impeller and its bearing was replaced last week. I also scraped quite a nice family of barnicles off the prop and shaft. Then I started the little girl and.....for the life of me.....since the discharge is below the waterline, I can't tell if water is being discharged......or blowing air and the resulting splash from the big "bubble" makes it look as if water is coming out. I held my fingers over and in the outlet and just can't tell. Don't really know how much water is suppose to come out, but it doesn't feel like any. Any help appreciated!
- Status
Feel the hose
Lightly touch the hose that connects the engine heat exchanger with the mixing elbow and see if it is getting hot. Hot indicates water flowing and since it is not controled by the thermostate it should do the following upon a COLD start: Water in hose is at engine room temp upon engine start. Immediatly cold (~60 degree) raw water is pumped through the hose so it should get cold. The anti is not up to temp but raw water is still flowing. As the engine heats up so should the hose as now the anti is transfering some of the heat to the raw water. You may also be able to tell how much flow by squezing (use a glove) and letting go. this is an aquired skill so don't think your dumb if you can't tell the difference when trying to gage the flow rate. I did it for a living for 4 years. You could also listen at the water lift muffler for gurgling sounds which would indicate water flow. good luck
Lightly touch the hose that connects the engine heat exchanger with the mixing elbow and see if it is getting hot. Hot indicates water flowing and since it is not controled by the thermostate it should do the following upon a COLD start: Water in hose is at engine room temp upon engine start. Immediatly cold (~60 degree) raw water is pumped through the hose so it should get cold. The anti is not up to temp but raw water is still flowing. As the engine heats up so should the hose as now the anti is transfering some of the heat to the raw water. You may also be able to tell how much flow by squezing (use a glove) and letting go. this is an aquired skill so don't think your dumb if you can't tell the difference when trying to gage the flow rate. I did it for a living for 4 years. You could also listen at the water lift muffler for gurgling sounds which would indicate water flow. good luck
GOT IT!!
The thru hull was clogged with barnacles and jelly fish. Cleaned it out and I now have water flowing. Question now is.....have I destroyed the impeller running it dry? Bill....I will follow your advice. Thanks much
The thru hull was clogged with barnacles and jelly fish. Cleaned it out and I now have water flowing. Question now is.....have I destroyed the impeller running it dry? Bill....I will follow your advice. Thanks much
- Status