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  1. #1

    Default 150 hp johnson cooling system

    On my 1999 150hp Johnson I replaced the water pump because when I removed the plugs for the thermostats while running their was no water coming out. After replacement still has no water coming out unless you put your thumb over the center port to restrict the water coming out the center port. I noticed this port is threaded so is their a re-stricter that screws in this port? I just bought this boat and want to make sure I have no problems when I go to Gunnison Colorado in June.

  2. #2
    Join Date
    Apr 2016
    Location
    barnegat NJ
    Posts
    2,706

    Default Re: 150 hp johnson cooling system

    More troubleshooting of cooling system is needed, Was water pump housing sealed? Was watertube from pump to powerhead intact? Are water intake ports in l/u clear? Try a piece of weedwacker string in telltale port," Pisser" With thermostat housings removed from heads water should geyser out of those heads, Is the engine overheating?

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