overheating?...merc 120

C

conron

Seaman
Joined
Jun 23, 2010
Messages
55
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
 
J

jagilbert

Seaman Apprentice
Joined
May 28, 2010
Messages
39
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.
 
C

conron

Seaman
Joined
Jun 23, 2010
Messages
55
Re: overheating?...merc 120

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

NHGuy

Captain
Joined
May 21, 2009
Messages
3,631
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?
 
C

conron

Seaman
Joined
Jun 23, 2010
Messages
55
Re: overheating?...merc 120

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

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
70,513
Re: overheating?...merc 120

Ayuh,.... Change the Impeller....
 
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