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Old 08-07-2016, 10:16 AM   #1
DHeckrotte
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City: Philadelphia, PA
Vessel Name: Revel
Vessel Model: 1984 Fu Hwa 39
Join Date: Nov 2015
Posts: 1,024
Perkins 6.354 overheating incident

I ran the engines for the first time in a month and thought I should exercise 'em a bit, warm 'em up, instead of simply moving from slip to mooring. I headed into a 15kt breeze with minor chop. Chugging along at 1800 rpm, the boat did perhaps in the upper 7's knots, temps reached maybe 200 deg. Increased to 2000 rpm, the boat did into the mid 8's, temps increased slightly to maybe 210. Increased to 2200 rpm, temps to 220 plus. Increased the throttles to maybe 3/4 travel, the port engine topped out at 2350, and the starboard 2400. At wide open throttle, the rpms did not increase further. Speed into the lower 9's, temperature in the port engine crept up to 240, temperature in the starboard crept up a smidge higher and set off the idiot light and alarm.

Perkins' manual says 2800 max rpm for a short time and 2400 rpm continuous.

I backed 'way off the throttles and both engines cooled down.

I would have thought that the cooling system would have coped comfortably with at least the Perkins' 2400 rpm continuous. Water temp upper 70's, air temp upper 80's.

Both impellers are new, all hoses are new; don't know the state of the heat exchangers. Engine hours, supposedly, are 1030, original in 1984.

Do I have something to fix?
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