R-and-R
Active Member
- May 9, 2018
- 258
- Boat Info
- Boatless
- Engines
- Boatless
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I had the same thing 10yrs ago when getting my current boat. There must be enough water flowing through the heat exchanger to cool the engine's closed system, but in my case the exhaust manifolds were substantially blocked by corrosion. Raw water pumps were fine.
Our of curiosity was it the port side exhaust hose? I recently changed mine along with the butterfly valves at the y pipe and while I was at it I changed all the distribution hoses as a matter of maintenance not because of failure. Anyway the molded 1" hose on the port side that goes from the t stat housing to the water portside manifold was going to be a backorder so I replaced it with new 1" heater hose and made it ling enough to do a gentle curve instead of the molded ones 2 90degree bends .i used ed a pipe securement to the bulkhead to makevsure it stays . in place I was pleased because my risers are now equally cool while prior to this change my portside riser was noticeably hotter to the touch..
I also wonder if it would be less money in the long run for guys who run in salt water to just go with aluminum manifolds and risers.
If you buy a spare raw water pump it will probably be the same cost as getting a mechanic to change the impeller. Rebuild it when you have time. Lots of utube on how. Then take the rebuilt one and put it on the other engine.
As to risers plugging off, it takes mine 3 years before I see white smoke (stream) in the exhaust and in the 5th year it last a couple of minutes. When that happens I replace the risers. They are not fully blocked but have a lot of rust in them and the cast iron looks good but when hit with a hammer it easily chips at the matting faces..
Good point, thanks. A dock neighbor of mine mentioned exactly the same thing yesterday.
I've only had the boat about 2 months. I know the manifolds are not original, but I don't know when they were replaced. How did you analyze the problem to figure out what was causing the insufficient water flow?
I'm pretty mechanically inclined and thought replacing the impeller would be an easy and inexpensive first step. But about 30 minutes in, I realized I was getting in over my head, so now I have to wait for my mechanic to respond to my pleas for help.