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?...

Re: Calling all Merc Mechanics
 

Here is the link to the sand post:

http://www.wellcraftv20.com/cgi-bin/...03;start=11#11

Re: Calling all Merc Mechanics
 

Here is the link to the sand post:

http://www.wellcraftv20.com/cgi-bin/...03;start=11#11

Re: Calling all Merc Mechanics
 

You have a positive on the t-stat housings. I don't know what the last pic is ???

Airslot

Re: Calling all Merc Mechanics
 

You have a positive on the t-stat housings. I don't know what the last pic is ???

Airslot

Re: Calling all Merc Mechanics
 

Well its pumping, so pump good.

Stats next, cheapest thing!

then remove heads when all else fails.

Kajun with the sand:

http://www.wellcraftv20.com/cgi-bin/...num=1166410103

Re: Calling all Merc Mechanics
 

Well its pumping, so pump good.

Stats next, cheapest thing!

then remove heads when all else fails.

Kajun with the sand:

http://www.wellcraftv20.com/cgi-bin/...num=1166410103

Re: Calling all Merc Mechanics
 

I was thinking sand as well. I know looks can be decieving, but that motor with such low hours and the condition its in, should be only a quick fix.
Where is Master, Lord SKOOL at. ???

Re: Calling all Merc Mechanics
 

I was thinking sand as well. I know looks can be decieving, but that motor with such low hours and the condition its in, should be only a quick fix.
Where is Master, Lord SKOOL at. ???

Re: Calling all Merc Mechanics
 

Randleman, so what did te wife say. She like or are you sleeping in the V tonight ?? ;D

Re: Calling all Merc Mechanics
 

Randleman, so what did te wife say. She like or are you sleeping in the V tonight ?? ;D

Re: Calling all Merc Mechanics
 

R-man, i just went out to look at my 94 150 mariner. there should be a hose that goes from one of the ports on that valve to your carbs. I'll snapa few pics and get back to ya.

Re: Calling all Merc Mechanics
 

R-man, i just went out to look at my 94 150 mariner. there should be a hose that goes from one of the ports on that valve to your carbs. I'll snapa few pics and get back to ya.

Re: Calling all Merc Mechanics
 

Good job Phats. ;)
I want the motor running good when Randleman donates it to me. ::)

Re: Calling all Merc Mechanics
 

Good job Phats. ;)
I want the motor running good when Randleman donates it to me. ::)

Re: Calling all Merc Mechanics
 

I/O guy here......sorry i am of no help on this one :'( ;D

Re: Calling all Merc Mechanics
 

I/O guy here......sorry i am of no help on this one :'( ;D

Re: Calling all Merc Mechanics
 

I will pull the thermostats tomorrow and cross my fingers.

When I was looking for the serial number earlier, I found something else not connected, I'll get pics of it tomorrow. It looked like it may have been related to the oiling system, assuming it had that. It runs on premix now.

Re: Calling all Merc Mechanics
 

I will pull the thermostats tomorrow and cross my fingers.

When I was looking for the serial number earlier, I found something else not connected, I'll get pics of it tomorrow. It looked like it may have been related to the oiling system, assuming it had that. It runs on premix now.

Re: Calling all Merc Mechanics
 

Yep, '99 woulda been an auto-oiler...glad to hear she's a mixer now...did you talk to David about it?



R-Man...are you familiar w/ Accu-Mix bottle...easiest way to mix gas/oil 8)...$3.99 at most dealers (Merc or others) and I think I saw 'em in Wallyworld...

Re: Calling all Merc Mechanics
 

Yep, '99 woulda been an auto-oiler...glad to hear she's a mixer now...did you talk to David about it?



R-Man...are you familiar w/ Accu-Mix bottle...easiest way to mix gas/oil 8)...$3.99 at most dealers (Merc or others) and I think I saw 'em in Wallyworld...

Re: Calling all Merc Mechanics
 

David did not know much about boats, especially this one. I think he only took it out 2 or 3 times all the years he had it.

Accu-mix bottle came with the boat filled with oil. ;D

Re: Calling all Merc Mechanics
 

David did not know much about boats, especially this one. I think he only took it out 2 or 3 times all the years he had it.

Accu-mix bottle came with the boat filled with oil. ;D

Re: Calling all Merc Mechanics
 

TinMan was having overheat issues as well w/ his 98 200 Merc. He hasn't been around much lately......he did alot of diagnostic/trail and error......didn't get it sorted out yet but there was alot of speculation leaning toward the "poppet" valve. Mercs seem to have their share of cooling issues. A bevy of information to be had on THT about Mercurys. Hope you get it worked out, nice boat too , good luck :D

Re: Calling all Merc Mechanics
 

TinMan was having overheat issues as well w/ his 98 200 Merc. He hasn't been around much lately......he did alot of diagnostic/trail and error......didn't get it sorted out yet but there was alot of speculation leaning toward the "poppet" valve. Mercs seem to have their share of cooling issues. A bevy of information to be had on THT about Mercurys. Hope you get it worked out, nice boat too , good luck :D

Re: Calling all Merc Mechanics
 

She liked it, glad too cause there are no cushions in the cabin. She is a good woman who puts up with my boat addiction.

Re: Calling all Merc Mechanics
 

She liked it, glad too cause there are no cushions in the cabin. She is a good woman who puts up with my boat addiction.

Re: Calling all Merc Mechanics
 

I wonder if this is the poppet valve.

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

Re: Calling all Merc Mechanics
 

I wonder if this is the poppet valve.

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

Re: Calling all Merc Mechanics
 

With the barbs on those two nipples, there's GOTTA have been hoses on those at some time...I'm thinkin' oiler related...particularly since oiler discoed ;) ...wonder if those holes should be plugged?... ??? ...




Good deal on the Accu-Mix bottle ;) ...

Re: Calling all Merc Mechanics
 

With the barbs on those two nipples, there's GOTTA have been hoses on those at some time...I'm thinkin' oiler related...particularly since oiler discoed ;) ...wonder if those holes should be plugged?... ??? ...




Good deal on the Accu-Mix bottle ;) ...