Glastron3.0GLP-C
Seaman
- Joined
- Oct 21, 2012
- Messages
- 61
I need some help to solve this issue that I am having for a few weeks now. The large cooling hose (U shaped) between thermostat housing and circulation pump was blown and I was towed. My engine is a Volvo Penta GLP-C with a SX-M drive and it is raw water cooled only. I checked several things and I put a new hose and I connected a pressure gauge at the thermostat housing plug to check pressures. I went to the river and at 3000 rpms it was reading 30 psi, at idle less than 5 psi and at WOT 4600 rpms 45 psi!! The pressure is excessive and in less than 1 minute the new Volvo Penta hose was disconnected from the thermostat housing and water was splashing everywhere again. The temperature reading was at 170 degrees on gauge and I took my infrared gun and measured around 170 on the block and the head, about 90 on the manifold and about 95 on the riser.
I had an extra new hose but I just reconnected the undamaged hose and got back to the ramp with only 1000 rmps.
Here is what I did before I went to the river for testing today: I took out the thermostat housing and checked the bypass hole, I put a new tested thermostat, the old one tested good too. I took out the riser and I found an impeller piece the only one missing from last year between the riser and the rubber exhaust, I checked one more time the impeller and it is perfect since I change it at the start of the season. Hoses are unobstructed and I run water through the block and manifold. The engine does not overheat but the engine temperature alarm was coming on. ( I disconnected it and this was it, not the oil pressure or the riser temperature) but maybe is defective and unrelated since temperature was around 170. I did not remove the circulation pump.
What do you think is the problem? What should I check next? Circulation pump? Head gasket? Any idea or previous experience would help a lot since I have no more ideas.
I had an extra new hose but I just reconnected the undamaged hose and got back to the ramp with only 1000 rmps.
Here is what I did before I went to the river for testing today: I took out the thermostat housing and checked the bypass hole, I put a new tested thermostat, the old one tested good too. I took out the riser and I found an impeller piece the only one missing from last year between the riser and the rubber exhaust, I checked one more time the impeller and it is perfect since I change it at the start of the season. Hoses are unobstructed and I run water through the block and manifold. The engine does not overheat but the engine temperature alarm was coming on. ( I disconnected it and this was it, not the oil pressure or the riser temperature) but maybe is defective and unrelated since temperature was around 170. I did not remove the circulation pump.
What do you think is the problem? What should I check next? Circulation pump? Head gasket? Any idea or previous experience would help a lot since I have no more ideas.
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