Join Date: Jul 2002
Thanked 4 Times in 4 Posts
Rep Power: 15
Salt Water Cooling System failure.
R, I think you need to say what you mean by "...saltwater cooling system would fail in moderately rough seas and when pushed to over 5 knots." Fail in what way? Reduction in raw water discharge? Or do you simply mean the engine running hot, which points to the entire cooling system?
Suggestion: pull the end of the heat exchanger off (it should be a cap, sealed onto the end with a nut) where the raw water enters from the raw water pump. There may be debris there - weed, small pieces of impellar blade, etc. that restricts flow. Also, run a thin (1/8") but preferably rigid wire down each of the heat exchanger tubes - a piece of stainless or bronze welding rod is perfect for this, and cheap if you must buy it. If those passages are blocked, you''ll soon know it, tho'' that''s one of the first things a mechanic would have checked.