Calling all Merc Mechanics
 

My "new" 1999 Merc 150 is overheating. I was hoping that it was giving false whistles because of dead battery but with a good battery it still alarms.

I started the motor and within 4 minutes the alarm went off. There was a good stream of water spraying out but the water was very hot.


I am going to take Kajun's advise and check the thermostats. Are these the thermostat housings?

http://i145.photobucket.com/albums/r...r/101_0075.jpg

http://i145.photobucket.com/albums/r...r/101_0074.jpg



Also, shouldn't there be something attached to this?

http://i145.photobucket.com/albums/r...101_0073-1.jpg

Calling all Merc Mechanics
 

My "new" 1999 Merc 150 is overheating. I was hoping that it was giving false whistles because of dead battery but with a good battery it still alarms.

I started the motor and within 4 minutes the alarm went off. There was a good stream of water spraying out but the water was very hot.


I am going to take Kajun's advise and check the thermostats. Are these the thermostat housings?

http://i145.photobucket.com/albums/r...r/101_0075.jpg

http://i145.photobucket.com/albums/r...r/101_0074.jpg



Also, shouldn't there be something attached to this?

http://i145.photobucket.com/albums/r...101_0073-1.jpg

Re: Calling all Merc Mechanics
 

Those hoses look like bleeds, not the t-stats. and the last pic looks like some sort of valve.


I went and looked at my old merc and that is where the T-stats are on it. they just don't look big enough in your pics. If there the old style t-stats you can get them from WEST MARINE or even a evinrude dealer.

Re: Calling all Merc Mechanics
 

Those hoses look like bleeds, not the t-stats. and the last pic looks like some sort of valve.


I went and looked at my old merc and that is where the T-stats are on it. they just don't look big enough in your pics. If there the old style t-stats you can get them from WEST MARINE or even a evinrude dealer.

Re: Calling all Merc Mechanics
 

All I can read on the plate is 166856. I cant tell if there are any letters or numbers in front of this number.

Re: Calling all Merc Mechanics
 

All I can read on the plate is 166856. I cant tell if there are any letters or numbers in front of this number.

Re: Calling all Merc Mechanics
 

I am not a Merc guy but that is were the stats are. Just take them out for now and run with out to see if that solves the problem, if so get new ones and you good to go!!

As far as the 2nd thing I have no idea?

Re: Calling all Merc Mechanics
 

I am not a Merc guy but that is were the stats are. Just take them out for now and run with out to see if that solves the problem, if so get new ones and you good to go!!

As far as the 2nd thing I have no idea?

Re: Calling all Merc Mechanics
 

Wish Bigshrimpin' would stop by...he's a good Merc man...Hey BIG!!...little help over here ;D ...


Recently someone pulled the heads to find SAND filled the water passages...anybody remember who?...the pictures told a sad, but very fixable story...




overheat problems:

bad t'stat(s)
bad water-pump (impeller)
water flow (blockage)

Let's see...what else?...

Re: Calling all Merc Mechanics
 

Wish Bigshrimpin' would stop by...he's a good Merc man...Hey BIG!!...little help over here ;D ...


Recently someone pulled the heads to find SAND filled the water passages...anybody remember who?...the pictures told a sad, but very fixable story...




overheat problems:

bad t'stat(s)
bad water-pump (impeller)
water flow (blockage)

Let's see...what else?...