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| Water tube(s) clarification |
| Author |
Message |
    
Marko (Marko)
| | Posted on Monday, January 14, 2002 - 10:36 am: | 
|
Joe, thanks so much for your help. I am sorry to keep asking about the same problem, but I am confused. On my '77 85 hp Evinrude thread (new to the board)you advised:
"UPDATE... Marko, there were two models made that year. One had a two (2) tube type water pump, the other had a one tube type pump. Which one do you have? The two tube simply recirulated the water until the thermo opened... only one tube was a supply tube. The one tube type had two thermos whereas the two tube type had one thermo."
OK...if I have the two tube system, and one thermostat...and, if the deflectors were damaged on the port bank, would there be LESS water coming out of the port cylinders (when I remove the rubber water hose)? OR, would there be the SAME AMOUNT as the starboard bank, but just not flowing around the cylinders in the proper flow path to cool the cylinders properly?
I bought a manual to help (clymer), but was a little disapointed to find that the thermostat and powerhead section really didn't have too much info about the water tubes/thermostat. None of the pictures in this section look like MY engine
Is my engine "loop charged" or "cross flow"?
I still can't figure where the water ENTERS the cylinder/block. Is it possible to measure that flow by forcing water thru the pump via ear muffs???, it seems it would tell me whether one of the copper water tubes is really kinked. |
Joereeves (Joereeves)
| | Posted on Monday, January 14, 2002 - 07:22 pm: |
|
Marko... I've never gave it much thought, but it would seem logical that if deflectors were causing a water restriction on one bank, that flow would seem less at the hose area.
Clymer is a good manual but it's difficult to cover everything (so many models). However, I would think that if the manual is for your engine, that problem wouldn't exist. The water enters the powerhead via a small hole (about a 1/8" hole I believe) at some point near the center starboard area of the powerhead.
Your engine is a crossflow model. The pistons are domed (cupped intake/sloped exhaust). The loopcharged pistons are similar to a automotive piston (flat on top).
I have no idea how one would measure the water flow.
The kinked tube question..... Measure up from the base of the exhaust housing (the long tube between the powerhead and the lower unit) to the bottom of the water tube(s). Now, with the water pump on the lower unit, figure where that measurement would be (using the top of the lower unit casting as a guide) if the tube was inserted in the w/pump. If it shows that the tube would be at the bottom of the gromment, the tube is not kinked.
The thermostat is more or less a self explanatory item once you dismantle it and shouldn't present a problem.
Joe |
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