72 Evinrude 50hp moist air blowing from pee hole with lower unit submerged.

[kippstakes]

engine was running hot after i installed new lower unit. this model doesn't have an independent pee hole, so i installed a tap in the coolant jacket as an alternative. cranked her up today and only moist air is coming out, should be a steady stream.
don't think this model even has a thermostat, tho i could be wrong, so it should be pumping h2o constantly right?
i am also absolutely sure the ascending copper hose is connected to the pump on the lower unit, i re-installed the unit literally 7 times before figuring out a way to get them to mate up conclusively.
also, i installed the impeller immediately before mounting the unit, so i am sure that the key's in place and impeller's in fine condition.

any ideas? not sure how it could be blowing air with the pump intakes under water.

 

[Daviet]

Re: 72 Evinrude 50hp moist air blowing from pee hole with lower unit submerged.

You do have a thermostat, #12 below.
Pump intakes under water, you have to have the water pump under water, the water level should be at least 4-6" above the cavation plate.
The water pump will not suck water very well, that is why the pump has to be submerged.
:: iShopMarine.com ::

 

[TrueNorthist]

Re: 72 Evinrude 50hp moist air blowing from pee hole with lower unit submerged.

Are you sure you tapped into a cooling jacket and not the exhaust? I've seen that before.

 

[kippstakes]

Re: 72 Evinrude 50hp moist air blowing from pee hole with lower unit submerged.

thank you for the replies.
i am pretty sure it's not the exhaust.
the last picture on this page is exactly what my engine now looks like-- elbow joint just above the top cylinder behind the flywheel, and a tube away from it.

http://forums.iboats.com/engine-fre...johnson-evinrude-adding-tell-tale-222677.html

I will try putting the lower unit into deeper water and see if more happens. Thank you for the suggestion.

 

[pn]

Re: 72 Evinrude 50hp moist air blowing from pee hole with lower unit submerged.

try blowing some air into it to dislodge possible crud.

 

[TrueNorthist]

Re: 72 Evinrude 50hp moist air blowing from pee hole with lower unit submerged.

Could be a blown head gasket, but that's getting a bit ahead of things. Is there exhaust in the "moist air" that is coming out?

 

[kippstakes]

Re: 72 Evinrude 50hp moist air blowing from pee hole with lower unit submerged.

no exhaust in the air. it is cool, clear, and produces consensation inside the tubing.

 

[kippstakes]

Re: 72 Evinrude 50hp moist air blowing from pee hole with lower unit submerged.

okay, tried her with cuffs today and got water flow from the tube. took some video if you'd like to check it out, maybe give an opinion on whether or not i should be getting a strong stream, if you don't mind..? seems a little weak, but then the tubing used is pretty large ID.

Evinrude 50hp 1972 installed pee hole tube - YouTube

look healthy, or should i take further action?
thank you

 

[kenmyfam]

Re: 72 Evinrude 50hp moist air blowing from pee hole with lower unit submerged.

Looks like a reasonable amount. Personally, I would be checking the head temperatures before heading out to open water.
Good Luck with everything.

 

[Vic.S]

Re: 72 Evinrude 50hp moist air blowing from pee hole with lower unit submerged.

okay, tried her with cuffs today and got water flow from the tube. took some video if you'd like to check it out, maybe give an opinion on whether or not i should be getting a strong stream, if you don't mind..? seems a little weak, but then the tubing used is pretty large ID.

Evinrude 50hp 1972 installed pee hole tube - YouTube

look healthy, or should i take further action?
thank you

It is only supposed to be a telltale, not a water outlet.

You should fit an outlet nipple (pt no 0321885) and connect the hose to that as described in the link you give for the reasons given at the beginning of the link.

That will reduce the flow , allow the pressure to build up and you should then have a good powerful jet of water. From memory the outlet nipple is only about 1/16" diameter internally

 

[Daviet]

Re: 72 Evinrude 50hp moist air blowing from pee hole with lower unit submerged.

Looks like a pretty good flow, but be careful, running on a hose can mask a water pump problem because the water pressure will over come a bad water pump.
Did you try running it with the water level 4-6" above the cavation plate, did it pump better?

 

[pn]

Re: 72 Evinrude 50hp moist air blowing from pee hole with lower unit submerged.

i take that back no amount of crud would block that hose. ditto on small line and fitting to build up pressure.

 

[kippstakes]

Re: 72 Evinrude 50hp moist air blowing from pee hole with lower unit submerged.

I'll start looking for a smaller outlet in that case, sounds like good advice.
Unfortunately I don't have access to a tub or barrel tall enough to fill more than an inch or so over the cav plate, so I might just have to take her to the lake and try in at the dock.

Thanks again, everyone!

 

[Daviet]

Re: 72 Evinrude 50hp moist air blowing from pee hole with lower unit submerged.

Just back it in and leave it on the trailer for testing, get the lower unit in deep enough.

 

[jbjennings]

Re: 72 Evinrude 50hp moist air blowing from pee hole with lower unit submerged.

Just a tip--- that motor won't spit water out of the exhaust relief on muffs, but should spit water out of both exhaust reliefs when used at the lake.
I agree on the factory nipple---it will look factory and work great. I've got the same motor as you and have an indicator rigged up just like you.
JBJ