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How much is a 1972 Johnson 85hp outboard worth?

I have a 1972 Johnson 85hp outboard. Why does it only "PEE" at high RPM'S not at idle?

  • Answer:

    i'd start with changing the impeller. the impeller is what takes water from the lake and puts it through the motor, to exit as a stream of "pee" as an indicator and with the exhuast. the impeller is rubber star shaped part. its mounted off center in a circluar housing (or centered in an off round housing). in the housing, the blades of the impeller are pressed in tightly on one side, and barely on the other side. this changes the volume of space between the blades, drawing in water as it expands and pushing it out as it shrinks (if you know how a rotary engine works, its the same but with only intake and exhuast cycles). impellers should be changed after 100 hours of use, because its wearing out. OR after 3 years, because its losing flexibility. if its not as flexible anymore the blades dont easily move back out as they should to expand the space while sealing against the housing, it just doesnt pump water as well. impeller is located on top of the lower unit, fairly easy to change yourself. its only about $30 or $40 for the part. as for getting the parts, its an OLD outboard. i tried to find a site with them and a diagram of the lower unit that shows it, i could only find 73 and newer...... parts avaibilty FORCED me to retire my 76 johnson last year. it sucks, but 30 years is a LONG life. and the newer outboards are a LOT nicer, EFI 4 strokes, direct injection oil 2 strokes (no pre mixing), more fuel economy, quieter AND cleaner.

Joe at Yahoo! Answers Visit the source

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That motor does not have a telltale, at least not from the factory. It might have been installed later though. But my guess is, you are referring to the "exhaust relief ports", the two holes just south of the cowling on the aft end of the motor? They are there to relieve some of the backpressure on the underwater exhaust, which would otherwise make starting the motor very difficult if not impossible. You may or may not see water coming out there at low RPMs. Most of the cooling water exits through a series of holes on the lower unit.

jtexas

The water pump impeller is probably shot and is not able to push enough water at low speeds could cause over heating at slow speeds

Scott

Put a set of muffs on engine and connect to water hose, if you get a solid steam of water coming out, your impeller on water pump is worn out. It needs to be checked once a year and changed every other year.

mike p

U have a restriction somewhere try spraying something up the pees tube. Or weak water pump or thermostate.

45 auto

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