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I am restoring a 22" Revenge with twin 92' Evinrude 120s. I noticed that the water outflow on the starboard engine was less than the port engine (less than a steady flow). I decided to replace the entire water pump assembly on the starboard. (Since the boat was purchased used, I have no idea if/when the pumps were replaced since new). After replacement, there was no significant change in output. I have not replaced the small hoses going to the outflow port. The water that does come out feels much cooler than the water coming out of the port engine, even though there's a lot less of it.
Does anyone have any suggestions as to what may be the problem?
Is it possible to flush the engine to remove any blockage in the water coolant system?
Thanks
I would start with all the little hoses and also check the fitting that the hoses attach to. Some of these fitting are right angle and they can hold debris, gravel, etc....
If you haven't replaced the thermostats, I would replace them at this time also.
If the hoses and fittings or the thermostats don't do the trick, then there is a possibility of some kind of corrosion internally... I hop this is not the case...
I looked at the SELOC manual and it appears that the thermostats are easy to change on the 120 hp model. It looks like there is one at the top of each cylinder stack behind a cover plate. I'll let you know how it goes.
The first thing to check (as said) is the water pump. The stat too. I moved a sail boat once with a small outboard on it a considerable distance. I was told the "Pisser" (tell Tail) was not working but, the pump was. After testing the motor to make sure it did'nt over heat, I moved on. About an hour later I heard a pop and the "Pisser" started working. Some sort of corrosion blockage had given way under the heat and pressure from the pump/motor. The important thing is that the pump is working, and discharging spent cooling water out the prop hub, or Exhaust relief port. Did you replace both the wear plates for the impeller on the pump ? sometimes they look o.k but, have grooves worn in them that makes the pump less efficient, also don't try and flip the impeller over for re-use as the vanes will bend the other way and break from stress. If I had to guess, I'd say that you just have a blockage by the discharge hose, prolly salt scale or something. How often should you replace your water pump ? I did it every year, and got almost 20 years out of my outboard. I gave it to someone last year, and they tell me it's still running (I did have a friend rebuild it after it ate a piston ring about 8 years ago). Outboards have many advatages (speed, wt. small size etc.), unfortunately, the High reving RPM's on them don't do much for engine life. A diesel inboard is a better choice for a boat engine, as you can get 40 yrs out of a properly maintaned one. The disadvantage of the Diesel is wt.. The compression is so high on them, that the blocks must be made extra heavy. Another disadvantage is that you can't fit one on a 15' Whaler sport (mine). Outboards have the best power to wt ratio, unfortunatly after about 10 yrs ( I know, some last longer w/ proper care and luck) of use, you can just unbolt them, and convert them to a mooring anchor as far as I'm concerned. Lotsa $ too, Last year I bought a puny little 2005 Evinrude 50 H.P., and nearly had a heart attack when I was handed the bill. "BOAT" =
MW,
I replaced the entire water pump assembly, housing and all. I thought there may be a block somewhere too. Do you know a way to 'flush' out the system. Is there a chemical that can be added to the water in order to loosen up any buildup?
With the old outboards there was no real way of backflushing the outboards. However, Steve Leone developed this little unit that people on the wave really have raved about.
This might be something that is worth a try. Sounds like you have taken all the right steps to correct the problem. You know every motor is different, and so long at that motor is not overheating then it might not be a problem.
Am I to assume that you're a Salty? If so, I had the same experience with my Suzuki DF60 that had only tasted salty,briny, sediment laden marine juice throughout it's short life...wouldn't piss right at all! After I moved her to her new home in fresh water it slowly started dissolving all the crud that had built up over 5 years. It literally took 2 months of running nearly everyday to get that nice steady stream working again. If you have access to fresh water try running it for a day or two in that, it will help. If not, hook up your Mickey Mouse ears and run as much fresh water as you can through it, it will dissolve the salty buildup...;);)
MW
