- Jun 5, 2016
- 5,634
- Boat Info
- 410 Sundancer
2001
12" Axiom and 9" Axiom+ MFD
- Engines
- Cat 3126 V-Drives
I think Tom may be on to something here.To add what @dtfeld was saying - Cat ELC if not changed per guidelines will form a "slime" on the internal surfaces of the engine and inhibit heat transfer. Not saying this is the issue but one of the reasons to keep to the maintenance regiment.
The first thing I'd check is the gear cooler and see if grass or other debris is starting to restrict flow. The gear cooler is the choke point in the raw water loop. And the engine coolant pump belt. Quite possibly the idler pulley has loosened up and that belt is slipping.
Edit: You can open the raw water side of the HEX to look, without dumping the coolant as well.