O C Diver
Guru
- Joined
- Dec 16, 2010
- Messages
- 12,880
- Location
- USA
- Vessel Name
- Slow Hand
- Vessel Make
- Cherubini Independence 45
Don't know if this will help you, but I had a similar problem on my generator. Was having high temperature issues under full load. Rodded the heat exchanger, flushed the fresh water side, replaced thermostat & radiator cap, rebuilt the raw water pump, and finally measured output flow from exhaust. No joy. My dealer suggested that I might have sediment build up around the lower tubes in the heat exchanger on the fresh water side. He said that flushing wouldn't remove this as it's caked to the tubes. He had a place he sent them to that cleaned them with an ultrasonic cleaner.
I have an ultrasonic cleaner for rebuilding scuba regultors. So I removed the end caps and put it in the ultrasonic with white vinegar (acidic acid ) for 10 minutes. This brown cloud rolled out of the exchanger and I was sure I had either cleaned it or destroyed it. Rinsed the exchanger with water and reassembled the cooling system. Works perfectly now and can run a full load test with 85 degree raw water temperatures without the temperature gauge moving off the minimum.
Not all radiator shops have an ultrasonic cleaner big enough to handle an engine exchanger, but you can probably find one in most large cities.
Ted
I have an ultrasonic cleaner for rebuilding scuba regultors. So I removed the end caps and put it in the ultrasonic with white vinegar (acidic acid ) for 10 minutes. This brown cloud rolled out of the exchanger and I was sure I had either cleaned it or destroyed it. Rinsed the exchanger with water and reassembled the cooling system. Works perfectly now and can run a full load test with 85 degree raw water temperatures without the temperature gauge moving off the minimum.
Not all radiator shops have an ultrasonic cleaner big enough to handle an engine exchanger, but you can probably find one in most large cities.
Ted