1993 Force 120 overheat alarm

[astroman01]

Hello this is a post for a friend he has a 1993 force 120, and this is his problem it seems the alarm only sounds in we idle. We can first put in and go full throttle but as soon as we idle back it sounds. So then we let it cool to when you turn the key it does'nt sound then we take off again and its fine till we idle back down. Is this an impeller that is bad or possibly a thermostat bad?

 

[roscoe]

Re: 1993 Force 120 overheat alarm

Replace them both, its part of normal maintenance.

 

[roscoe]

Re: 1993 Force 120 overheat alarm

Keep running it the way it is and it will eventually overheat and warp the head.

 

[Reel-Fun]

Re: 1993 Force 120 overheat alarm

I just replaced the whole water pump in mine the housing had some gouges in the surface it wasnt a expensive fix only 48$ and i have a much better peice of mind... wasnt hard make sure you turn the water pump housing clockwise when you go to put it on...

 

[carlosestevan]

Re: 1993 Force 120 overheat alarm

if i put 80s one piece drive shaft lower unit and leg on my 1993 force 120 hp you think that affect cooling system cause after i put a older model leg and lower unit my overheating alarm come on, i change the water pump and still the same any information is apreciated

 

[jason32038]

Re: 1993 Force 120 overheat alarm

Search for impellars for both units. I think they're different.

 

[carlosestevan]

Re: 1993 Force 120 overheat alarm

??????

 

[jerryjerry05]

Re: 1993 Force 120 overheat alarm

When you installed the lower did you make sure the water tube connected with the pump?I think there was modifications needed to swap.Don't remember what they were,Sorry.J

 

[capri1600]

Re: 1993 Force 120 overheat alarm

If it isn;t clear enough, investigate the situation and repair as necessary because you are on the way to warping the head. I'd guess the leg change needs more than just swapping the leg so you might have missed something there. otherwise, drop the lower unit, replace the impeller at a minimum and really look ovetr the plate and see if you might want to just replace the whole water pump assembly. I'd hate yo hear you lost your engine.

Marty
http://www.martyhammersmith.com

 

[carlosestevan]

Re: 1993 Force 120 overheat alarm

yes my boat was hit from behind,and broke the lower unit and leg ,is a 1993 120hp force by mercury but i buy a older model 120 i think is a 1987 ,one piece shaft mine used to be two piece shaft so i do the swap everything fits perfect i put a brand new impeller gasket and housing y tried without the thermostat and still do the same alarm is coming on on hig speed when i go below 3000 rpm shuts off water pump is not big enough ???? because the two piece drive shaft water pump it looks bigger but i dont know if is any difference my new but older lower unit was on a 120 also what is the diference?????