JOHNSON 15

[TIMAIDAN]

HI CAN ANYONE HELP IVE GOT A JOHNSON 15 SERIAL NO B015996 CAN YOU TELL ME AGE AND HP . ALSO WHERE IS THE WATER SUPPOSED TO COME OUT OF THANKS TIM

 

[JB]

Re: JOHNSON 15

We need the model number, Tim.<br /><br />Also, please don't post in all capitals. It seems like SHOUTING.

 

[TIMAIDAN]

Re: JOHNSON 15

hi modle no j1jbalcrm<br />and can you tall me how i can tell if its pumping water thanks tim

 

[TIMAIDAN]

Re: JOHNSON 15

sorry modle number is j15balcrm<br />thanks tim

 

[roscoe]

Re: JOHNSON 15

You have a 1984 model, great little motor.<br /><br />Water should exit through the center of the propeller.<br />Also, a small stream of water should exit the telltale, which is located at the back starboard side of the engine, a few inches behind the gear shift lever. The telltale often becomes plugged with dirt/debris. It can be cleaned out with a small wire.

 

[TIMAIDAN]

Re: JOHNSON 15

hi thanks for info but i only have a very small amount of water comming from there which seems to slow down even more when engine gets hot is this nomal thanks tim

 

[roscoe]

Re: JOHNSON 15

No, not normal.<br />Time to replace the waterpump impeller and the thermostat.

 

[TIMAIDAN]

Re: JOHNSON 15

thanks for all the help removed thermostat replaced impeller now pee's well thanks tim

 

[TIMAIDAN]

Re: JOHNSON 15

hi every body took boat out for first time today and engine still overheated can anything else be wrong? thanks tim

 

[umblecumbuz]

Re: JOHNSON 15

What were the symptoms of overheat Tim?<br />And was the telltale still spouting water, or did that stop?<br />And what boat are you running on?

 

[Guest]

Re: JOHNSON 15

If it's an '84 Johnny 15 hp, it's an excellent motor. I had an '80 'rude and it was just terrific. Had it for years with no major problems. Keep the plugs clean, tho!<br /><br />Bill

 

[TIMAIDAN]

Re: JOHNSON 15

hi water was running but was told it was not enouth engine got realy hot then started spitting steam every 5 seconds boat size is 5 mt engine cut out when wires melted on cylinder block thanks tim

 

[umblecumbuz]

Re: JOHNSON 15

When you removed the cylinder head cover to get to the thermostat, presumably you checked out the waterways and they came up clean?<br /><br />I don't think you can put the tstat in backwards because of its shape, but if it was possible this would explain your symptoms. In any case, if the tstat was not opening, overheating would quickly occur.<br /><br />Somewhere, Tim, there's a blockage in the waterways. If the motor still runs, try a trial run without the tstat to see if there's an improvement.

 

[TIMAIDAN]

Re: JOHNSON 15

hi never replaced tstat ran without one took leg off put hose on copper pipe to try to flush with pressure but some of the water came back down the outside of the pipe is this nornal or should it be sealed into engine thanks tim

 

[umblecumbuz]

Re: JOHNSON 15

The water flow circuit is roughly as follows:<br /><br />Water is pulled in by the pump (impeller) and pushed up the copper tube, which should be sealed top and bottom. It then goes round the powerhead, with some going out of the telltale, through the cylinder head and cover, where its flow is regulated by the tstat. At this point it's hot, and it then flows back down the lower unit outside the copper tube and around the exhaust tube - exiting through the vent holes above the AV plate. <br /><br />If you have water coming out of these vent holes, then it's circulating. But - there could be a blockage within the power head, causing the overheat problem.<br /><br />It seems to me though, that you may not - as you've said - have enough flow. The telltale should show a strong flow. If you can hold the tube out sideways, it should make a good arc through the air, not just dribble straight down.<br /><br />If you can run the motor on muffs, the above flow pattern should show up. If it runs on muffs without overheating, then that tells you you've got a water pump problem.<br /><br />Hope this helps.