fryedaze
Guru
- Joined
- Sep 4, 2011
- Messages
- 1,752
- Location
- USA
- Vessel Name
- Fryedaze
- Vessel Make
- MC 42 (Overseas Co) Monk 42
Our engines have always had inadequate cooling. It is a design flaw in the early Cummins 6BT engines. The boat runs 180-190F in warm (75-80F) water at 1500 rpm. It will not run at 2500 rpm for more that a few minutes without going over 205F and continuing to climb. 2600 rpm is WOT. Previously I have increase fitting sizes and hoses on some of the recommendations from Tony at SBMAR. I came across an article he wrote about the older Cummins cooling issues an it recommended a larger opening 160F thermostat that they had developed. I installed them last week. The new cooling performance is very good. I now cruise at around 170F at 1500 rpm. I ran at 2500 rpm for an extended period of time and the temps stayed below 200F. Previously I had to focus on the temp gauges hovering around 200F anytime I went above 2000 rpm to catch a bridge opening. This is one of those "I should have done this 10 years ago" moments. The old thermostats were 180F, stamped 6/1988.
Just sharing
Just sharing
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