Rocket Robinson
Recruit
- Joined
- Aug 12, 2013
- Messages
- 2
I've read several previous threads on this, and it's been an problem that I have dealt with previously. The enigine is a Volvo 130 C (1985, Chev 350) inboard/outboard with San Juan fresh water cooling. It generally runs at 160 degrees, but this past weekend went up to 175 degrees while planning at 2300 RPM's. Should not do this. I changed out the raw water impeller (the old one was about 6 years old, but didn't appear in poor condition) and have ordered a new thermostat (140, like the old one), but don't have a lot of hope this will fix it. The fresh water pump does not leak or squeek, no loss of antifreeze. My questions:
1) Is there a way to eliminate the possibility that it is sucking in air at the raw water intake while planning? I read that the fitting on the outdrive can become corroded and suck air. The boat is 26' long and it's costly to pull it. If I was to simply run the engine at 2300 RPM in neutral would that tell me anything? The fitting would be under water, but there would be no load on the engine. (am awaiting the new thermostat to fire it up again).
2) I have removed and done the coat-hanger clean and water jet on the manifolds, the last time being about 4 years ago (ps: at that time I installed a T-valve in the hose just past the raw water pump that allows me to flush out the seawater from the system when back at the dock). Do I have to remove the manifolds to wire-clean them, or can I do that through the end caps? Is there a way I can tell if it's the manifolds / risers that are plugged up?
Thanks for any help! Mark
1) Is there a way to eliminate the possibility that it is sucking in air at the raw water intake while planning? I read that the fitting on the outdrive can become corroded and suck air. The boat is 26' long and it's costly to pull it. If I was to simply run the engine at 2300 RPM in neutral would that tell me anything? The fitting would be under water, but there would be no load on the engine. (am awaiting the new thermostat to fire it up again).
2) I have removed and done the coat-hanger clean and water jet on the manifolds, the last time being about 4 years ago (ps: at that time I installed a T-valve in the hose just past the raw water pump that allows me to flush out the seawater from the system when back at the dock). Do I have to remove the manifolds to wire-clean them, or can I do that through the end caps? Is there a way I can tell if it's the manifolds / risers that are plugged up?
Thanks for any help! Mark