overheating?...merc 120

[conron]

I have bought my first boat and I love it but there are problems because I was ignorant going in. Now I have an overheating problem and was wondering if I could get some pointers as to where to start. thermostat? water pump? hoses? anything would be helpful. Thanks

 

[PNW Driver]

Re: overheating?...merc 120

Impeller.

 

[Bt Doctur]

Re: overheating?...merc 120

1st place would be in here
http://forums.iboats.com/showthread.php?p=1693398#post 1693398

 

[jagilbert]

Re: overheating?...merc 120

Yeah, its surely the impeller. Its a pain to replace the first time, once you get the hang of it, it gets easier. Do a search - there are a couple of good threads on how to replace it. Make sure you get all the chucks of old impeller out.

 

[conron]

Re: overheating?...merc 120

even though I still have water flowing through when i use muffs?

 

[NHGuy]

Re: overheating?...merc 120

Yup, the town water has it's own propulsion, the impeller propels the water outside the boat into the boat engine.

What Merc 120 do you have? I assume an I/O. What year and drive? On what boat?

 

[conron]

Re: overheating?...merc 120

its a 1986 merc 120 and alpha one drive on a 86 Starline 16 ft

 

[Bondo]

Re: overheating?...merc 120

Ayuh,.... Change the Impeller....