1996 Mercury 150HP pee water ???

[Glenn]

I don't know your motor specifically, but the intake should be in the lower unit.  Mine are attached with allen bolts. I have an '03 Yamaha HPDI.

Same with poppet valves - mine is a pain in the butt to get to.  It's 45 mins of taking things apart to get to it - and that's if you know what you're doing!  I presume yours is easier.  Maybe somebody here knows specifics.

I thought about it overnight, and remembered one time not only was my poppet clogged, but the line from the intake to the valve was clogged as well.  Compressed air did the trick in that case.

And just to be clear - your poppet valve could be operating normally, but might be clogged.  Or it might simply be a blocked line.  I wouldn't replace the valve unless I knew it was broken.

[Fishbone]

How are you fellows getting a water pressure reading?

[CHEVYRIDAZ]

PSI gauge on most. I got the poppet valve off and all gaskets are wasted and spring is corroded. Will replace and crank er up again.

[CHEVYRIDAZ]

Alright i got pretty much everything out that needed out except for the intake screen. I have looked everywhere for it and cannot find one anywhere! Where is the intake on a 96 150 HP EFI? Is the intake the holes where the muffs go over? If so there are no screens there. Anyone???

[Glenn]

Yes, it's where the muffs go over.  I would think there should be screens there, as they're supposed to help keep junk out. 

[fishfordollars]

While you have the poppet valve apart you might want to check the diaphragm very carefully for pin holes. It is very common for it to have them. As I stated above, check to see if the seat has floated out of the block. It happens so look for that.

Jack

[cwb60]

Never tried this, but don't know why it wouldn't work, just to check.

Catch the pee water in a container and put a candy thermometer in it and see how hot the water coming out is. It should be slightly cooler than the thermostadt setting.

cwb60

 

[CHEVYRIDAZ]

Mine has no screens nor has any other Mercury outboard that i have owned. I called Mercury marine and they said that most if not all Mercs do not have them. I checked my bros 2006 Merc 200hp and a friends 2002 150HP and they have no screens either. Anyone know more about this? I went ahead and bought the whole poppet kit to be safe. It was only $25 anyways. I will be testing it all out in the water Wed so we will see.

[fishn hard]

In 1996 there was no screens on the lower unit That lower should be a XR6 case or some call it the 200 case.Glenn gave you some good advice.Now you say that there is corrosion In your popet valve and thermostats!That tells me that it has been run in saltwater replace the popet take the boat out and run it As long AS YOU HAVE 12PSI AT WOT YOU ARE GOOD. I think on the starboard side of your motor on the head you will see a Brown and blue wire going to a sensor on your head that is your over heat alarm you can unplug that and ground it and you should here your alarm go off.Now on the other head is your temp sensor it has a brown wire the only good way to test it is to compare it with another gauge Now between the heads is you divider plate at the bottom there should be a plug or a fitting with a rubber hose that is attached to your bottom cowl that you can hook a hose to and flush your system If it only has the plug in the plate you can take that out and get some adapter's and hook a hose to it that way and sometimes when a impeller is destroyed Little pieces of impeller get into the water passage's Of the divider plate and cause low water psi and the only way to fix that is to remove the plate and clean out the passages manually I know this is long and I hope Im not confusing you These are just some of my experience's And I dont want you to Trash your motor If i can help Pm me your number and Ill call and try and help you out

[CHEVYRIDAZ]

In 1996 there was no screens on the lower unit That lower should be a XR6 case or some call it the 200 case.Glenn gave you some good advice.Now you say that there is corrosion In your popet valve and thermostats!That tells me that it has been run in saltwater replace the popet take the boat out and run it As long AS YOU HAVE 12PSI AT WOT YOU ARE GOOD. I think on the starboard side of your motor on the head you will see a Brown and blue wire going to a sensor on your head that is your over heat alarm you can unplug that and ground it and you should here your alarm go off.Now on the other head is your temp sensor it has a brown wire the only good way to test it is to compare it with another gauge Now between the heads is you divider plate at the bottom there should be a plug or a fitting with a rubber hose that is attached to your bottom cowl that you can hook a hose to and flush your system If it only has the plug in the plate you can take that out and get some adapter's and hook a hose to it that way and sometimes when a impeller is destroyed Little pieces of impeller get into the water passage's Of the divider plate and cause low water psi and the only way to fix that is to remove the plate and clean out the passages manually I know this is long and I hope Im not confusing you These are just some of my experience's And I dont want you to Trash your motor If i can help Pm me your number and Ill call and try and help you out

Man that is awesome of you fishn hard! PM sent

[shuddyssoup]

One thing I might agree with (and it's really minor), is that if the water pressure is too high, the water can pass through the motor too quick to actually transfer any heat. Some people stretch the poppet valve spring just a little to increase pressure but ... 12 psi sure is a good number. If anything, you've gained a wealth of knowledge about your motor and it's workings. Good luck with it.

[shuddyssoup]

I was asleep when I wrote that. DISAGREE with ... DUH. If the water pressure is too high it can actually make the motor run hot. The rest I THINK I got right. Woo Wee ... sleep don't fail me now.

[fishfordollars]

When I mentioned screen I was not referring to a wire mesh. Maybe a bad choice of words. There is a plate just inside the entry openings. Sorry for the confusion.

I have a lower unit sitting here that I am going to put seals and bearings in this morning. I will try to take some pics during the tear down and post them up if that will help you.

[fishfordollars]

I have sent them to Long Mike asking him to put them up. All my family has up here is fr&*^%$g dial up.

[NBR]

140 Water is pretty hot to the touch. Before I spent unneccessary money I'd catch a sample and check the temperature with a thermometer. If the temp of the sample is 140 or less you should be just fine.

[CHEVYRIDAZ]

I have all kinds of issues now guys! I put it all back together today and decided to run it with no  thermostats to clear the passages out. I cranked it up and water is only coming out of the passenger side head! Water will only come out of the driver side if i rev the engine? The driver side head is getting hotter than the passenger side too. Than i put the thermostats back on and the motor wouldn't even turn over. I put the key to the on position and alarm check beeps than nothing!. Not even a noise from the engine. All fuses are good and battery is charged. I AM DONE WITH BOATS!!!!!!

[fishn hard]

It has been crazy at work sry I didn't get to call you but i will tomorrow we need to talk

[CHEVYRIDAZ]

Thanks for the help fishn hard! Most of the issues have been resolved...................for now!

[fishn hard]

Your welcome just call any time you need help!! that goes for the rest of you guys  :)

[CHEVYRIDAZ]

Finally took er out on the water today. PSI is at 14-15 at WOT. Temp looks good and she topped out at 67MPH. Only one issue left that i can see. After a couple minutes of wide open throttle the motor just shuts off! No alarms no overheating or any obvious issues. If i crank it right back up it goes again just fine. After a few minutes it seemed to stop doing this a bit. Is this because the engine is been sitting a long time or what. Maybe a fuel issue or bad battery? Anyone?

[MichaelAmerican]

I have the same engine and the detailed service manual however I have yet to figure out my problem.  The engine starts and runs but when idling the alarm beeps. I am seeing water coming out of the pee hole when you take off the beeping stops....Inherited the boat but lost my lifelong fishing partner (Dad) so it sat up for a while. Just got the courage to get back in it...

If you would like a copy of the manual let me know.....

 

[TnRiver46]

14 hours ago, MichaelAmerican said:

I have the same engine and the detailed service manual however I have yet to figure out my problem.  The engine starts and runs but when idling the alarm beeps. I am seeing water coming out of the pee hole when you take off the beeping stops....Inherited the boat but lost my lifelong fishing partner (Dad) so it sat up for a while. Just got the courage to get back in it...

If you would like a copy of the manual let me know.....

 

I had a similar issue, although mine sometimes wouldn’t pee in gear at the lowest throttle. I would always get the alarm at low throttle or neutral.  My intake tube was cockeyed, problem solved 

[WRB]

Water coming out the bye pass hole (pee hole) means little on ears, hose pressure is pushing the water.

The engine doesn’t get water to cool it until the thermostat opens.

If the water pump is working properly the gage should be steady reading, not humping around. 

That engine also has exhaust port, when you see water mixed in the exhaust the thermostat is open, water pump is working.

Enjoy your fishing,

Tom 

 

[jbsoonerfan]

I wonder if ol CHEVYRIDAZ still has this motor some 12 years later.