HELP!!! 79 Johnson 35hp water problem

[FISHBONE74]

Hello
I have a 1979 johnson 35 hp with a water problem and have tried for 6 months to fix if any body has any ideals Please let me know. my problem is it pumps water just fine when the motor is turning over but when it finaly starts it is just like somebody turned the water off i have replaced the water pump , thermostat, pulled water jacket cleaned all the water lines i have hooked up my water hose to the water line with the lower unit off and let the water run through thinking i might have missed something but the water runs straight through with no prob. put it all back togather and same prob can someone Please HELP!!!!

Thanks in advance
Fishbone74

 

[5150abf]

Re: HELP!!! 79 Johnson 35hp water problem

Does the overheat alarm come on?

How do you know it isn't pumping when it is running?

 

[FISHBONE74]

Re: HELP!!! 79 Johnson 35hp water problem

i do not have any water at the tale tale and to the best of my knowledge i do not have a over heat alarm at least i have not found any signs of having one (i have re wired the whole boat front to back)
thanks
todd

 

[5150abf]

Re: HELP!!! 79 Johnson 35hp water problem

The over heat alarm I believe is inside the control box but if it has been rewired hard to tell if it is working.

The only thing I can think of is that the pick up tube isn't aligned right other than that it makes no sense to me, it should be the other way around, when the motor is cranking it is going at its slowest speed so pumps the least.

Without being able to see the motor it is hard to tell what is wrong.

Got me stumped, hang tight for one of the pros, maybe they will have an idea.

 

[FISHBONE74]

Re: HELP!!! 79 Johnson 35hp water problem

Thanks for trying to help any and all sugestions are appriciated greatly i have owned this boat since november of 07 and have not made it to the lake yet. Thanks to all who have helped
Thanks
Fishbone74

 

[5150abf]

Re: HELP!!! 79 Johnson 35hp water problem

I think you may have solved your peoblem,,, are you running this on muffs?

If so the water pump on these engine isn't self priming, it needs to be submerged to pump.

Mine pumps like a champ on the water but it is hard to get it to on muffs in the drive.

If you haven't yet get it in the water and see what it does.

 

[FISHBONE74]

Re: HELP!!! 79 Johnson 35hp water problem

well i actually do not trust the muffs so i have a very large trash can that i have the motor sitting in
thanks
fishbone74