No cooling on Johnson 9.9 -74

[viktor_89]

As the topic says I don't get any waterbeam from the "coolingwater output". The engine is a Johnson 9.9hp -74. I have recently changed the impeller. I have only started it with waterhose connected and not in sea, can that influence? Any ideas?

Thanks in advice!

 

[OptsyEagle]

Re: No cooling on Johnson 9.9 -74

Put it in a barrel with the water above the water pump level and try it again. Very little water comes out the exhaust port when flushing hose it used. Not exactly sure why.

 

[viktor_89]

Re: No cooling on Johnson 9.9 -74

I tried to put it i a barrel just before I changed the impeller, then it came some water from the exhaust port but not much at all, that was the reason to why I changed the impeller. But I will try to do this also with the new impeller, maybe it doesn't work with flushing hose on those old engines? Thanks for the answer btw!

 

[SeaKaye12]

Re: No cooling on Johnson 9.9 -74

I have one of those and with mine it pees immediately from the telltale...but very little water from the exhaust port until after (i assume) the thermostat opens.

 

[OptsyEagle]

Re: No cooling on Johnson 9.9 -74

The '74 model will not send much water out the exhaust port until the T-stat opens in about 15 seconds. Before that you only will get a very light mist, that you can only detect when you put your hand under the exhaust hole.