Re: Overheated but tell tale spraying water?
I noticed that you didn't state if you changed your impeller or housing. A worn or old impeller (waterpump) may pump some water but not as efficiently. But if you have change the impeller and no water tube obstruction then see a few suggestions below
I edited my post after re-reading your input.
We all worry if our water pump is working and cooling the head and preventing overheating and damaging the cylinders, pistons, and ruining our precious piece of machinery.
A good investment and a piece of equipment that will give you peace of mind is a laser digital thermometer that you can get at Harbor Freight and other places of that sort for about $20 to $30 dollars. You can measure the temperature of the heads on side and near the sparks plugs (basically around the cylinder head).
**Some people say that you if you can hold your hand to a cylinder head for about 3sec then you should be ok......Well to me that is not a 100% reliable method, because we all have different heat tolerance of touch. I'll tell you 140 to 150degrees feels hot to me, but it is acceptable running temps. Best bet is just to get a temp reading with the old temp sticks or a laser digital thermometer....(they or cheap enough for a peace of mind and they can also be use to measure the temperature of cooking oil when frying a turkey(but that is another story).***
The thermostat(T-stat) partially opens around 135 to 140 degrees and is fully open around 160 degrees. The thermostat opens and allow water to circulate around the water jackets around the cylinders to maintain temperatures less than 163 degrees.
Exhaust relief hole or water indicator that is expelling or discharging water is an indicator that your water pump/ impeller is working only. It does
not mean that your engine is properly being cooled and water is circulating around and through the water jackets.
Things that can cause an powerhead to over heat even though you have a good stream of water coming out of the exhaust relief hole or water indicator.
1. Stuck or obstructed Thermostat from salts, to junk, gunk and sand. Just bad T-stat
2. Obstructed passage to the cylinder heads caused by foreign material (bits of an old impeller), salts, and sand. (Obstructed water tube near power head or distorted water tube gromet)
3. Sand, salts or foreign material occluding the water jackets prevent water from circulating around both cylinders.( This happened to me and I removed the the cylinder head and cleaned out the passage ways and a new T-stat. My Evinrude 6hp was back in business)
4. Swollen water deflectors in larger motors and can be caused by an overheating situation. (these are never mentioned in service manuals)
5. Blown head gasket between cylinders that allows heated compressed air in the water jacket systems and prevent water from circulating.
6. Lean carburetor adjustment and not enough lubrication to inside the cylinders, pistons and rings.
If your engine is primarily used around salt water or sandy environments then chances are that statements 1, 2, or 3 are a high possibility. (So flush your motor well after a salt water run with fresh water)
If the motor is used but new to you, any of the situations could apply.
I'm sure some of the some the experts on this forum could easily supply more information.
I hope this helps you out and good luck!!!
cajuncook1
