'77 70hp johnson over heating

[boatdumb]

so, i posted a problem with no fire, got that fixed it was the power pack. Thoughr everything was good to go now. took it out on the water today and 10 mins. out it over heated. got back home and pulled the thermostat (not a good sight) started it up again (ya it did start) ran it for a couple of mins. just for kicks pulled the thermostat housing and there had not been a drop of water through the housing. i just replaced the impeller last week any ideas on the problem?

 

[snapperbait]

Re: '77 70hp johnson over heating

When you replaced the impeller, were you able to account for all of the old impeller?... If not, it's possible that some of the old impeller got stuck in the pipe..

 

[boatdumb]

Re: '77 70hp johnson over heating

snapperbait<br /><br />the whole impeller was intacted.

 

[snapperbait]

Re: '77 70hp johnson over heating

I say drop the lower unit and make sure the pipe lined up correctly with the pump housing.. Otherwize, I'd look to the pump for the problem..

 

[boatdumb]

Re: '77 70hp johnson over heating

snapperbait,<br />thanks i will check that out tomorrow. i guess i may have to brake down and take it somewhere if i can't figure it out. i'm just a stubborn girl that wants to do it on my own though so thanks for the advice and i'm sure i'll be back with more questions, maybe one day i will be able to answer some.

 

[OBJ]

Re: '77 70hp johnson over heating

BD....did you run the motor after the impeller replacement or did this happen after the power pack replacement? It's possible ya' missed the impeller key. Maybe slipped out when ya' installed it. Don't give up girl. You can fix it. Has to be something simple. (anyway's...that's the way I think)

 

[boatdumb]

Re: '77 70hp johnson over heating

OBJ,<br />I'm pretty sure I got the key back in place. I'm going to pull it apart again this afternoon and double check. <br />Thanks and I'll let you guys know what the outcome is.<br /><br />boatdumb

 

[K Hultgre]

Re: '77 70hp johnson over heating

Are the impeller blades pointing in the direction of the driveshaft rotation? i.e. turn driveshaft clockwise while installing waterpump housing.

 

[K Hultgre]

Re: '77 70hp johnson over heating

oops. counterclockwise

 

[boatdumb]

Re: '77 70hp johnson over heating

the key had slipped out, resulted in damaging the head gasket so now i'm replacing that.

 

[Mandoman]

Re: '77 70hp johnson over heating

I noticed that you pulled the thermo stat and replaced it on your engine. I have a later model engine and am wondering whether it was particularly hard to remove the cylinder cover to replace the termo and whether you needed any special tools ?

 

[boatdumb]

Re: '77 70hp johnson over heating

Mandoman,<br /><br />there are no special tool needed. <br /><br />boatdumb