Something Broke During Impeller Change 73 Evinrude 25hp

[carpking]

Went to do an impeller change. Did everything by procedure. Loosened linkage, loosened bolts, etc. Used a rubber mallet to tap lower unit down. It was stuck pretty good from old build up, but popped loose. When it dropped, small pieces of plastic fell out. Appear to be pieces of some type of collar. Looking up into unit, I can see a loose O-ring just above hole where lower unit sleeve slides in. I'm assuming I've broken an upper unit seal or something...:grumpy: Any advice is much appreciated.

 

[carpking]

Re: Something Broke During Impeller Change 73 Evinrude 25hp

Found a diagram that shows real pictures of the parts. It appears to be indeed pieces of the upper seal. Either already broken before hand or somehow damaged as I removed lower unit. So, next question...is this this something a shade tree marine mechanic can repair? Cant really afford to send it to mechanic. If I can't repair it then motor is probably all but toast.

 

[glenn property of pam]

Re: Something Broke During Impeller Change 73 Evinrude 25hp

that may be the old water pump shaft seal. is there still a seal thats on the shaft as it enters the water pump looks a bit like a oil seal. post picture of old seal and the lower unit if you are unsure

 

[carpking]

Re: Something Broke During Impeller Change 73 Evinrude 25hp

Here are pics of the lower unit impeller area. The collar you seats into a hole. The loose o-ring is resting above the smaller hole that lower unit gear arm slides through. Pieces of plastic also pictured. Only thing on upper part of lower unit was a small o-ring below gear slots.

 

[carpking]

Re: Something Broke During Impeller Change 73 Evinrude 25hp

Looking at diagrams, I'm guessing it is the broken pieces of the drive shaft seal. Would this involve removing the power head to repair?

 

[carpking]

Re: Something Broke During Impeller Change 73 Evinrude 25hp

O.k., realize I'm posting in rapid succession here. It looks like I should be able to replace the seal if I could remove the exhaust housing. With a flash light, I can see where the seal is supposed to seat. Not exactly sure of what part number I need. It is the seal where the lower unit drive shaft enters power head. Again, how difficult is this job?

 

[glenn property of pam]

Re: Something Broke During Impeller Change 73 Evinrude 25hp

your pictures are proberly to big as they are not showing up. looking at the diagram for your motor the bottom seal is locked in by 2 metal retainers with a spring and c-clip so dont panic yet

on this diagram it shows a o-ring but ive seen older ones that have a seal washer instead or the seal is part of the water pump housing(part#11) Evinrude Gearcase Parts for 1973 25hp 25352A Outboard Motor

 

[glenn property of pam]

Re: Something Broke During Impeller Change 73 Evinrude 25hp

O.k., realize I'm posting in rapid succession here. It looks like I should be able to replace the seal if I could remove the mid-case housing. Sorry, not sure of proper term. Again, how difficult is this job?

lol no problem. if you can see a big gap between the shaft and the inside of the water pump when looking down the shaft at the lower then that may be the problem (light to dark brown in color i think)

 

[carpking]

Re: Something Broke During Impeller Change 73 Evinrude 25hp

O.k., nothing broke on the lower unit itself at all. Seals are fine. The plastic pieces originated from where the toothed section of lower unit drive shaft enters back into power head. I had to take a long screw driver inserted upward to knock out remaining pieces. I have looked at exhaust housing diagram and see nothing. When looking at crank shaft and piston diagram, the only thing I see that resembles the pieces is number 24 on diagram, which just says carbon seal, part number 0302538.

 

[glenn property of pam]

Re: Something Broke During Impeller Change 73 Evinrude 25hp

carbon seal is not plastic its normally black and is like dull glass. hopefully someone who has worked on that model will chip in with in the next 24hrs and tell you what/how to fix it.

 

[carpking]

Re: Something Broke During Impeller Change 73 Evinrude 25hp

Yeah, that's it. Shiny and black. Looks like a ring about 3/16 think with a groove or recess on the I.D. of it.

 

[glenn property of pam]

Re: Something Broke During Impeller Change 73 Evinrude 25hp

looks like you are going to have to pull the powerhead off to get to the carbon seal.

 

[carpking]

Re: Something Broke During Impeller Change 73 Evinrude 25hp

looks like you are going to have to pull the powerhead off to get to the carbon seal.

Anyone know how many bolts hold it to lower housing? Which linkages need to be unhooked?

 

[oldcatamount]

Re: Something Broke During Impeller Change 73 Evinrude 25hp

You'll need to disconnect the (vertical) throttle rod swing arm at the top, where it attaches to the ignition plate. Should be a slide on/off clip there. Just below the top of the throttle rod there is a clamp with two screws in it. Remove those screws. The throttle rod should lift up and out of there (through the rubber base gasket). Unhook the fuel line at the pump, the battery cables (if electric start) and any ground wires attached to the lower cowl. Disconnect the choke lever and unscrew the needle valve all the way out of the carb. Should be 7 bolts holding the powerhead in place. One of which should be a bit larger in size and a bit tougher to see (it's under the front portion of the cowl). When all is disconnected and the bolts are out, you'll need to pry up (gently) to break the base gasket seal under the powerhead.

 

[carpking]

Re: Something Broke During Impeller Change 73 Evinrude 25hp

Yea, I counted seven hex head screws as well. The one in front to the right of the carb facing carb, seems impossible to get to. I can't get a socket or a wrench on it, and if I could, I don't see enough room to back it out far enough to release power head. Does this require a special tool? The screw is between bottom cowl and "handle", not tiller, the part under choke, kill switch, etc. part of motor, which is also part of lower cowl. It appears to screw into bottom part of intake.

 

[AlTn]

Re: Something Broke During Impeller Change 73 Evinrude 25hp

if you'll tilt the motor all the way up and swivel it towards the the gear selector side, you can see the front screw. It screws up into the powerhead base just like the others did and it is a larger diameter and head. I think I used a 1/4" drive with a 6" wobble extension to get to it.

You need to unbolt the shift hub <?> linkage on the gear selector side to pull the powerhead off as well.

Parts going back..exhaust housing gasket..carbon seal...oring that fits inside the carbon seal < diagram shows 2 in that area and I ordered both as I couldn't tell which was which >....you'll find a snap ring that holds this assembly together

 

[carpking]

Re: Something Broke During Impeller Change 73 Evinrude 25hp

if you'll tilt the motor all the way up and swivel it towards the the gear selector side, you can see the front screw. It screws up into the powerhead base just like the others did and it is a larger diameter and head. I think I used a 1/4" drive with a 6" wobble extension to get to it.

You need to unbolt the shift hub <?> linkage on the gear selector side to pull the powerhead off as well.

Parts going back..exhaust housing gasket..carbon seal...oring that fits inside the carbon seal < diagram shows 2 in that area and I ordered both as I couldn't tell which was which >....you'll find a snap ring that holds this assembly together

O.k thanks. I'll try that. Yea, I saw the old o-ring. Wondered how it all went back together.

 

[carpking]

Re: Something Broke During Impeller Change 73 Evinrude 25hp

if you'll tilt the motor all the way up and swivel it towards the the gear selector side, you can see the front screw. It screws up into the powerhead base just like the others did and it is a larger diameter and head. I think I used a 1/4" drive with a 6" wobble extension to get to it.

You need to unbolt the shift hub <?> linkage on the gear selector side to pull the powerhead off as well.

Parts going back..exhaust housing gasket..carbon seal...oring that fits inside the carbon seal < diagram shows 2 in that area and I ordered both as I couldn't tell which was which >....you'll find a snap ring that holds this assembly together

Still no luck. I just can't see how they (factory) got this screw in. And how anyone can get it out. Not possible to get a socket or wrench on it at all. Try to post a pic to give you an idea what I'm looking at. EVEN if I could get something on it, there's only about a 1/4 of an inch before the head would hit the part of lower cowl where steering pivot point is. I am beginning to believe I will have to unbolt intake from motor to remove power head as this one bolt is going through bottom part of intake manifold....:grumpy:

http://i296.photobucket.com/albums/mm167/djsteele95/IMAG1080.jpg?t=1365039358

 

[carpking]

Re: Something Broke During Impeller Change 73 Evinrude 25hp

Here is a couple (hopefully) showing the exit point of screw through intake.

http://i296.photobucket.com/albums/mm167/djsteele95/rps20130403_222759_841.jpg?t=1365042504

http://i296.photobucket.com/albums/mm167/djsteele95/rps20130403_222850.jpg?t=1365042557

 

[carpking]

Re: Something Broke During Impeller Change 73 Evinrude 25hp

A different question as well on fly wheel removal. I looked at the pinned article that says to use a harmonic balancer puller. However, my flywheel doesn't have any threaded holes in which to put screws. I am a little concerned of using a traditional O.D. puller as I dont want to warp or crack fly wheel. Any suggestions on this would be appreciated as well. Of course, if I can't get this power head off, this other issue will be mute....