150 evinrude

[ruder]

I have a 1988 150 e150stlcca that won't pump water.
I bought this motor on a boat and the motor had been extremely hot, the lower unit was off.
I checked the impeller and it didn't look all that bad, but I bought a new impeller and o ring and installed it and I started the motor and it ran good but there was no water, I shut it off and removed the thermostats, and the relief plastic valves were melted, I restarted the motor and removed the fitting that goes to block for the tell tell water, there was no water pumping through the power head.
I removed the lower unit and put a water hose on the copper tubeing from the impeller and turned on the water and there were no restrictions water ran ot of the thermostats and tell tell hole, I checked theseal that tube goes to in the water pump and it was good, I removed it and put it on the copper tubeing that goes to the power head and it fit tight,I mesured the tube to the upper seal and it goes into the seal fine.
I reinstalled the lower unit and started the motor and had same results no water filling the power head.
Is it possible the power head base gasket is between the in and out section that lets the pressure bleed over?
When the motor is running it has water pressure in the houseing that sprays out and a little bit of water comeing out of the upper exhaust holes in top of mid section.
Thanks for any help you can give me.
Ruder

 

[emdsapmgr]

Re: 150 evinrude

You have done some nice testing on your XP engine. It is unlikely there is a problem at the powerhead. Your hose test on the midsection water tube confirms you are able to pump water to the thermostat housings and the telltale. A good sign. Your base gasket is probably fine. Issue may be with the lower unit. Have you checked to see if there is sand/debris inside the water pickup screens below the water pump itself? If you run sand or mud, it is possible to plug these pickup screens and the water passage running up to the pump. You mentioned that the nylon pressure relief valves were heat deformed. Also likely that the water pump impeller plastic housing is heat deformed-you should put a whole water pump kit (which included the housing) into the lower, not just the impeller. I'd also put in new thermostats-that way you know you are starting out with everything new.. Also, recheck your assembly procedures. Make sure the copper tube is actually hitting the water outlet hole on the top of the impeller housing. The copper water tube can get bent/shifted if not properly installed by some prior owner and may not line up properly when you go to reinstall the lower.

 

[ruder]

Re: 150 evinrude

I have completely disasembled the water pump houseing and checked dowto the screens and shined a light through them and they are completely clear, the water pump house is not distorted looks good as new, the gasket under the plate is good, the rubber insert under the pump house is not real good but that should not keep water from filling the power head with a slight leak, maybe.
I pulled the water jackets off the heads and they were clear no debree of any kind.
the seal that goes to the water tube is good I took it out and put it on the water tube and it fits tight, the water tube was slightly distorted but I used a pair of needle nose pliars and twisted them inside and the tube is completely round. I started the motor after removeing the water jackets and water is trickling out of the bottom holes in the heads, measureing the length of the water tube to the bottom of the seal checks that the pump houseing is going inside of the seal, if the tube was distorted it seams to me that when I removed the lower unit the guide or seal would be distorted but it is good no signs of out of alighnment, the tube shows ousid signs that the seal is going inside. Thank you

 

[jiffyboat]

Re: 150 evinrude

did you check hole in the ears, or the water pressure, have you try putting the boat in the water?... I had a Johnson , that always took like 20-30sec to fill it up the power head , before it starting pissing , but in the water was perfect , found, there was not enough water pressure in the hose...

 

[emdsapmgr]

Re: 150 evinrude

The water jacket test is also a good test. If you reinstall the head covers and temporarily remove the thermostat covers-then start the engine. Do you get any water out of both thermostat ports? May be time to pull the heads and check the 6 rubber water diverters by each cylinder.

 

[ruder]

Re: 150 evinrude

No I haven't put it in the water but the water pressure is good and the ears are open, the pump is pumping but it just won.t pump enough pressure to fill the power head, just pumps water to bottom of heads and top holes in the houseing exhaust relief holes.
has any one heard of a bad water pump? Should I purchase another new one?
I am now thinking of removeing power head and checking the base gasket and checking to see if gasket is burned and letting the water pressure blow over in the exhaust outlet. This motor has been extremly hot, when I removed the head covers the gasket was brittle and was burned to the metal.
When I put a water hose in the copper tubeing the water gushed out of the thermostat holes and the exhaust plate screws were leaking. Thanks for your help

 

[ruder]

Re: 150 evinrude

I have all the covers off now when I star the motor and can see where the water is comeing to and the water is not comeing to the hole where the tell tell water comes to. It is a lucky thing that this motor still has good compression because it has been so over heated, it runs good and good idle and revs excellent. Thanks again

 

[Charlie Burke]

Re: 150 evinrude

I consider my self a shade tree mechanic,,replaced water pump on 94 150 intruder,,mine would not pump either,later discovered The half moon key on shaft had fell into lower unit,,fished it out reassembled an it worked fine.

 

[ruder]

Re: 150 evinrude

No key is fine there is not enough water pressure vthe pump is pumping.

 

[ruder]

Re: 150 evinrude

I am ordering parts will get back after I have it fixed Thank all of you

 

[wyngo]

Re: 150 evinrude

Take the back exhaust cover off, and see if there is some crap stuck in the passages. I had an issue once, and found some weeds stuck in the elbow that brings it to the tell tale.

 

[ruder]

Re: 150 evinrude

No I have the elbow out and when I hook up the hose to the tubeing to the power head water gushes out of thermostat openings and the open hole that feeds the tell tale. Thank you