1984 Johnson 70HP. Water pump Tell tale

[Ratherbefishing75]

 Good evening I figured I would ask here instead of surfing u tube for answers. So I recently acquired of a free boat and it is in very good condition and was well maintained but sat for 5 years   I got the boat home and began playing with it and it only took 5 minutes to get her to run and she runs awesome   Now I didn’t let her run to long as I didn’t have water hooked up to her yet. But planed on installing a new water pump and thermostat in her  the tell tail was plugged so I cleared it   Now the question here is should it be peeing water constantly when it is running. Or only when she is warmed up    I do know that smaller outboard motors do pee all the time done know if the same thing should be happening. 1984. 70 hp Johnson mounted on a 1968 mfg  

[Deleted account]

It should pee all the time when running, and never start it when not in the water or with muffs.

[Jig Man]

What he said.

[Ratherbefishing75]

That’s what I thought  thank you 

[TnRiver46]

Cool boat! 

[thomas15]

Quote

 

You might want to consider replacing all of the fuel lines and rebuilding the carbs. It might run great on muffs but under a load is a different thing entirely. Good luck!

[MickD]

If that engine has, like I think it does, a reservoir for the engine oil that is external to the engine to provide oil for injection into the engine. . . 

 

The pump that pumps that oil is a diaphragm pump VERY likely, after all these years, to fail.  Diaphragm pumps were a bad idea back then, and with many years on a rubber diaphragm, it very well could fail and in the process fail the engine (piston scoring).  

 

If what I suspect is true, the safest bet for you to use that engine is to mix the oil and gas rather than relying on a diaphragm pump.  

 

Don't ask me how I know.  $$$$