25hp water pump housing

[darknight]

hi guys, just got all my parts for the water pump on a 25hp t1 evinrude,
all parts are correct, checked all part numbers etc, but the problem is putting the gearcase back on.
its all lined up with the key way and water pipe etc, but just wont go any further.
so when looking at it again i noticed that the water pump housing hasnt got a slot in it for the keyway to go through, so as the hole in only just big enough for the shaft to go through, with no key way slot for it to go further on and ont the impellor it just wont go down.
is this a normal problem? should i cut a small groove to allow the key way to go through onto the impeller? as otherwise its just not going to go on.
cheers for any info on this

 

[F_R]

Re: 25hp water pump housing

hi guys, just got all my parts for the water pump on a 25hp t1 evinrude,
all parts are correct, checked all part numbers etc, but the problem is putting the gearcase back on.
its all lined up with the key way and water pipe etc, but just wont go any further.
so when looking at it again i noticed that the water pump housing hasnt got a slot in it for the keyway to go through, so as the hole in only just big enough for the shaft to go through, with no key way slot for it to go further on and ont the impellor it just wont go down.
is this a normal problem? should i cut a small groove to allow the key way to go through onto the impeller? as otherwise its just not going to go on.
cheers for any info on this

What in the world??? You are supposed to have the shaft in place and the impeller slid over it and the key BEFORE you install the pump housing over it.

 

[darknight]

Re: 25hp water pump housing

if i was to do that their would be no room to do up the 3 screws holding the water pump housing to the gearcase would there?.
i apoligise for this seemingly silly question then, but this is my first outboard

 

[darknight]

Re: 25hp water pump housing

F-R are you saying the drive shaft needs to be removed from the engine first? does this just pull/wigle out?

 

[psteurer]

Re: 25hp water pump housing

If you have the capability, it might be beneficial to post a picture of what you have. I am not clear on your last post. If you don't pull the driveshaft from the engine, how would you insert the new water pump parts?

 

[darknight]

Re: 25hp water pump housing

well as i say i am new to outboards, i assumed at first after the bits were assembled onto the gearcase it was just pushed up and aligned to fit, obviously thats wrong, i know now, but i cant get the drive shaft out, not sure if there is a locater bolt/pin somewhere i cant see, or it just needs a harder pull?

 

[psteurer]

Re: 25hp water pump housing

Are you saying you cannot separate the gearcase lower unit from the rest of the motor? If so, you also have to disconnect the shift linkage.

 

[darknight]

Re: 25hp water pump housing

ah no sorry, i seperated the lower gearcase to change the impellor, the housing and all the seals which i done no problem, but it seems like on mine i need to remove the drive shaft prior to refitting the water pump assembly, i mistakenly thought you put it all back together then just pushed the gearcase with water pump assembly on up to the top sectio and bolted it on, i know now thats wrong so im trying to find out how the drive shaft comes off, as it seems like its not a free floating one?

 

[jasper60103]

Re: 25hp water pump housing

The drive shaft is stuck in the motor. It should come down with ease. This is what happens when water goes up the drive shaft and corrosion sets in. A small rubber seal sits below the splines and should keep water out, but it is sometimes overlooked. Also, the drive shaft splines should be lubricated each time you remove it.

I heard others with this problem successfully work around it by cutting a slit in the water pump housing for the impeller key as you mentioned. Btw, what year is this motor?

 

[darknight]

Re: 25hp water pump housing

that seems like it could be the right thing concerning water, i have allready gone round the engine and replaced the thermostat and cleaned all the housing, the previous owner thought nothing was necessary to like maintenance
its a 71 evinrude, cheers for that, the previous housing was so badly coroded and pitted i wasnt sure if a groove was cut in it or it was corrosion

 

[jasper60103]

Re: 25hp water pump housing

You can also try working some oil up the drive shaft to try and free it up. Also, some light tapping may make it break free. Else, I would just leave it alone and work around it.

Also, sounds like you're doing a good job with maintenance. Enjoy your motor.

 

[darknight]

Re: 25hp water pump housing

thanks jasper, i have been trying to free it for ages, taping etc, but no joy,
will it be ok to cut a groove in the housing ok?

 

[jasper60103]

Re: 25hp water pump housing

yea, I would take that approach. I will try to search for some old threads concerning stuck drive shafts and post for you.

 

[darknight]

Re: 25hp water pump housing

thanks a lot mate, been a great help, its one of those things if you dont know you just dont know.
thanks again, much apreciated.

 

[jasper60103]

Re: 25hp water pump housing

Here's a thread that may be helpful. Sounds like the poster managed to work around the stuck drive shaft issue. Good luck.

http://forums.iboats.com/showthread.php?t=294885&highlight=drive+shaft+stuck+water+pump

 

[darknight]

Re: 25hp water pump housing

great!! for info, i used a dremel, with a small drill atached so i could carefully cut a groove big enough in the water pump housing to just allow the keyway on the shaft to slip by, all back together, i sank her in a tank and voila, loads of water where there was once none!!
thanks to all for your help, i knew i joined this forum, while being the other side of the pond for a reason, it was, great freindly help...CHEERS!!

 

[jasper60103]

Re: 25hp water pump housing

awesome!

 

[kbait]

Re: 25hp water pump housing

I finally get it! The old one impeller failed due to broken key (or it broke upon disassembly), so the drive shaft just stayed w/the powerhead. I couldn't figure out how he got the L.U. off with the shaft stuck. I love the fix for it!

 

[F_R]

Re: 25hp water pump housing

What you have here is a situation where the last guy that had it apart didn't replace or install the o-ring that goes around the top of the drive shaft. The o-ring is to keep water out of the splined socket in the end of the steel crankshaft. Without the o-ring, water gets in and rusts the splines in the crankshaft. That is why it is all rusted together and siezed.

Now, it depends on how much you love that motor. Someday that rust is going to complete its mission and the splines will be gone. When that happens, you will have no drive and the motor will be considered junk.

What you did will buy you time till that happens. If you wanted to ensure long life, you should have pulled the powerhead, beaten the drive shaft out of the crankshaft, and cleaned the rust out of the end of the crank. Then reassemble it correctly with a new o-ring and waterproof grease.

The third choice is the P.T. Barnum theory. Sell it to some sucker. I have unknowingly bought a few that way. Arr-r-r-g-g-hh!

 

[darknight]

Re: 25hp water pump housing

now she is up and running i know everything else on her is ok, so after a few runs out, i can assure i
you she will be stripped down and everything else i find done, as i want to keep this motor for myself, thanks again for all your help