Overheating With Closed Cooling System Club Sea Ray Next, inspect the heat exchanger tubes and flush out with fresh water. it's possible that some debris is clogging the exchanger or oil cooler sea strainer. if all that checks out, check the exhaust elbows and manifolds for scale build up and restriction. a stuck thermostat could also cause heating, as could low coolant in the exchanger tank. 156. atlanta, ga. boat info. 2000 sundancer 340. engines. 7.4l w v drives. 2000 340 7.4 v drives, closed cooling system. problem one my starboard engine is running hot at higher rpms, cools fine when reduced rpm and idle. problem two the inside exhaust manifold on my port engine is temping 155 degrees while all 3 others are around 120 degrees.
Overheating With Closed Cooling System Club Sea Ray I have a 1998 da 240 with a 5.0 mpi engine. it has a closed cooling system on it. engine will over heat, to 200 degrees when at higher speeds. it has new impeller on alpha outdrive, new t stat, new sending units. heat exchanger is clear and risers, manifolds and elbows all run cool. There should be no more than about a 20° fahrenheit (11°c) differential between the temperature of water entering, and the temperature of water leaving your engine. more than that is an indication of cooling system problems. if all of these turn out to be overheat dead ends, you can move on to the thermostat. This will be a long post but i thought it best to give a full history up front. 2007 sea ray, 125 hrs with a 5.0 bravo iii and smartcraft. this boat seems to have a history of overheating from the get go. girlfriend bought the boat 3 years and the low water pressure alarm kept going off. Thanks to everyone for their input. i'm helping someone address an engine overheating issue. their boat is a 2000 sea ray, twin 7.4l mpi mercruiser horizon engines. fresh water cooled, closed system, driven in the ocean. the issue is the starboard engine overheats under load (steam also in the exhaust). the port engine runs perfect at 165f.
Another Mercruiser Overheating Club Sea Ray This will be a long post but i thought it best to give a full history up front. 2007 sea ray, 125 hrs with a 5.0 bravo iii and smartcraft. this boat seems to have a history of overheating from the get go. girlfriend bought the boat 3 years and the low water pressure alarm kept going off. Thanks to everyone for their input. i'm helping someone address an engine overheating issue. their boat is a 2000 sea ray, twin 7.4l mpi mercruiser horizon engines. fresh water cooled, closed system, driven in the ocean. the issue is the starboard engine overheats under load (steam also in the exhaust). the port engine runs perfect at 165f. If you do go closed cooling it would be smart to run only distilled water in your cooling system about the first 5 times out and drain and refill the distilled water will help pull the salt out that has leached into the cooling passages. if you just add a coolant you risk turning it into a gel. Aug 29, 2014. #1. good evening, i have a 2001 crusader 5.7l tbi. motor has a closed cooling system cooled by a raw water pump heat exchanger. i have been working on the engine using a garden hose, however, it overheats when we tried to take the boat out on a fresh water lake. i bought it used, history reported to have low hours for what it's worth.
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