No water from pee hole. At a loss, HELP!!!

[Pair of Hounds]

Just got a 2000 Merc 135 o/b. Owner said it had a new water pump. had a week stream so I checked impeller. It looked good, no cracks,solid, etc. Has a bit of memory but I believe it to be good... Then checked Tstats and they were pretty dirty so I changed them. I also removed the poppet valve to inspect and it looked normal. Put the muffs on after the tstat change and now water takes even longer to flow than before. when it does flow, after about 2 mins, it seems very hot. It seems to me that water should flow out even when the tstats are closed by looking at plumbing. Could pieces of a old impeller be lodged somewhere? Impeller or housing be bad even though they look ok? Is it the nature of the engine? Where else can I look?

 

[skinorth]

Re: No water from pee hole. At a loss, HELP!!!

I just had the same problem on my Merc 25. I had just rebuilt the bottom end and replaced the impeller. I don't know if your motor has a similar setup, of course. On my motor there is a little hose leading from the top of the motor to the bottom rear of the casing to the hole where the "pee stream" normally comes out of the case.

I removed the bottom end of the hose from its location in the rear of the casing and tried blowing through it, but no success.

The little hose was totally plugged. I assume some insect might have built its nest in there during the last year that the motor was not being used. I actually removed the hose from the motor and ran a wire through it to remove the blockage. after reinstalling it, I could blow through the hose with no problem, and hear the air coming out down in the bottom end of the motor.

After that, the motor ran fine, and the tell-tale "pee" came from the back of the motor as per normal.

In my research I also read that it is possible for an old impeller to break into pieces, travel up the water tube, and block the internal passages of the water jacket. It is possible to remove the cover around the spark plugs, etc, to clean out this area, although I would think that would be a last resort. It might be possible to use compressed air first to blow any debris in there.

skinorth

 

[emoney]

Re: No water from pee hole. At a loss, HELP!!!

Did the impeller seems flexible/pliable when you inspected it? They can sometimes "look" ok, but end up being stiff as a board which means that "memory" is no more permanent. Wire through the pee-hole tube usually helps. As for the temp of the water, you're better off getting a Digital Thermometer and shooting a temp reading on the heads after the t-stat has opened. That way you know if she's running hot or not instead of supposition. Better to be safe that sorry I say. If you have a Harbor Freight, they've got a relatively inexpensive Digital Laser Thermometer for under $30 (I think). Simple; just point, squeeze the trigger and instant temp.

 

[Expidia]

Re: No water from pee hole. At a loss, HELP!!!

You're kidding right? You had the impeller out in your hand, but didn't bother replacing this $10 part that your expensive outboard is so dependant on???

Like the other poster said check for that hose being plugged, but in my opinion, don't ever trust what ever a seller tells you unless he can pull out a receipt for the parts. You can't tell the age of an impeller. You change them every 2 or 3 years (whatever your manual suggests). No manual, download one. I change mine every 3 years without caring how flexible it might be. There is a reason Merc says to change them. After a few years the fins can can simply break apart and clog up your cooling sytem. Buy a couple and keep one as a spare. Could save a vacation if you pop one from someting like sucking up sand while you are beaching your rig. Let us know what you found preventing it from peeing.

 

[Pair of Hounds]

Re: No water from pee hole. At a loss, HELP!!!

Thanks to all for tips and advice. I may be getting somewhere...I got the boat from a family friend and trusted that the water pump was new and called today to hear him say it again. He says it may have 30-40 hrs on it so not much use. I pulled hose loose from bottom of block and blew air through it. May have helped, not sure. Ran it on ears and water started to trickle much sooner and then after 30 seconds or so became a steady stream but not a powerful stream. At this point I still have the hose disconnected from the bottom of the block. Is that just a secondary vent for the exhaust? I can feel and see exhaust smoke coming from it??? Does warm water from the block need to return to that hole and come out the prop? Reason I ask is because after maybe 2 minutes the flow of water from the larger hose that leads to the hole from the top of the block has excellent flow... and if i crimp the end of the larger hose water will immediately jet out of the smaller hose leading to the tell-tale. Water pump appears to be fine. When everything is hooked up correctly, might it be that my exhaust pressure is not great enough to force water out the end of the tell tale? what do yall think???

 

[Pair of Hounds]

Re: No water from pee hole. At a loss, HELP!!!

Thanks!

 

[Pair of Hounds]

Re: No water from pee hole. At a loss, HELP!!!

any thoughts???

 

[Expidia]

Re: No water from pee hole. At a loss, HELP!!!

When running it in the driveway with muffs I don't get a strong stream at idle.

Don't know answers to your other questions as I'm not up on the inner workings stuff. At least your pump is newer as the seller said.

Carefull about reving the O/B up on the muffs. I think I've read in other threads it's not good for it.

Try the motor on a lake. You might find there is no peeing issue.

 

[Pair of Hounds]

Re: No water from pee hole. At a loss, HELP!!!

Looks like I have good flow through engine but when it circulates it bypasses pee hole and majority of water comes out prop.

 

[oldman570]

Re: No water from pee hole. At a loss, HELP!!!

When the motor is on the water it will have more backpressure on the exhaust and the water system and should pee more than on muffs. JMO
Oldman570

 

[Pair of Hounds]

Re: No water from pee hole. At a loss, HELP!!!

I damaged the small brass fitting that screws into bottom of the block. is it ok to run engine without water returning to exhaust port?