pee stream

[lunacyfringe129]

Engine: 1989 Merc 150 Blackmax <br /><br />This might sound like a weird question to some of you guys. I've noticed over the entire 5 years that I have owned my mercury that it never seems to have as strong of a water stream coming out the back as some of the other outboards on the lake, whether they be a 6hp johnson kicker or a new 225 optimax. I have a water pressure gauge and have replaced the water pump at a certified mercury mechanic every year. The pressure gauge always reads 12 psi at idle and ranges between 15-25 psi from 3000rpm to WOT. I've never worried about it since I always have more then enough water pressure, but it always bugs me when I look back at my motor and see water coming out of the hole with what seems like no pressure behind it at all, yet the mercury next to me could use its pee stream like a pressure washer. Anyone know what would cause this, especially since I consistently have pressure at or over 12 psi?<br /><br />Thanks Everyone!

 

[andy6374]

Re: pee stream

Yeah it's a bummer, my 88 200 Blackmax does the same thing. The tell-tale isn't the only place water exits the engine. I am guessing that's where a majority of our water is.<br />-andy<br /><br />I could be wrong. Maybe the pros know.

 

[andy6374]

Re: pee stream

However, mine only does this in idle.

 

[gss036]

Re: pee stream

I have a 1989 200 hp, which is probably the same block and that is the way mine is also. My wrench says this is normal. You might change the thermostats if they are real old and have been run in salt water.

 

[jessie11]

Re: pee stream

1992 Mariner 150hp V6 SN#OD124111<br /><br />Mine does the same thing, new water pump assembly one week ago. No change in tell tale hole, but does not run hot.

 

[dsrchamp04]

Re: pee stream

try cleaning out your fittings at both ends of the hose at the block and the engine bonnet where the hose exits....sometimes those get small amounts of blockage....use a peice of mechanics wire or even a small drill bit will work also...it only takes a second....im not a mechanic but ive seen it done several times on smaller outboards and it works great.

 

[KCLOST]

Re: pee stream

You will not see a constant full stream of water at idle until which time the t-stats open up...<br /><br />Your 12psi at idle is when the t-stats are closed... If you run the engine at WOT and then power down to idle or no-wake speeds, I bet you will see the water pressure drop down to about 5psi, and the water stream will be full and strong. This is because the heated up block will be enough to open the stats...

 

[lunacyfringe129]

Re: pee stream

Ok that thermostat explanation really makes sense. Thanks for the reply and clearing this up.

 

[KCLOST]

Re: pee stream

Normal for a Black Max......