1979 johnson 9.9 lower unit oil leak

cgates56

Recruit
Joined
Aug 15, 2009
Messages
5
Hi - I am a new boat owner. Just acquired said motor and it has oil leaking slightly out over the prop blades. I have not run it yet as I thought I would take the prop off and keep pulling parts until i found a bad gasket.
So I drained the oil and started in. I made it easily past part #22 in this diagram:http://www.sterndrive.info/sitebuil...res/W-Johnson-9.9-15-hp.-1974-thru-2006-2.jpg
Now I am stuck, and have a few questions. Starting with the easy stuff - there is a ton of oil buildup caked on to the parts I have pulled thus far. After I clean them and reassemble, do they need to be greased? And in general, how does a newbie know what lubes to use on these parts - does the service manual have all of this info?
Second - at this point (just past #22), I do NOT see any parts like #21. There is just a structure around the prop shaft that I cannot budge. There was also a very small circular coil, almost like a tiny round spring, that was very fragile and bent a bit when I removed it. I have not been able to find this in any drawings - what is it / is it needed?
Third - I have seen others use a special puller to get the shaft out. Is that needed and should I even be pulling that? I found 1 post with a similar oil leak problem but it only had 1 reply just saying 'don't worry about it'.

Any help would be appreciated. I am somewhat mechanically inclined but have zero experience with marine motors. Thanks in advance.
 

petryshyn

Commander
Joined
Oct 3, 2001
Messages
2,851
Re: 1979 johnson 9.9 lower unit oil leak

Hi
Was the leg oil low? Is it possible you are seeing exhaust residue? What does the oil look like? Does it smell like skunk?

Better determine what the oil is before going any further, as it could be normal...
 

Daviet

Fleet Admiral
Joined
Sep 24, 2008
Messages
8,958
Re: 1979 johnson 9.9 lower unit oil leak

Sounds like normal 2 cycle exhaust residue. Item 21 is a set of seals pressed into the exhaust housing, back to back. It sounds like the spring you found is supposed to be inside of the seal. Did you dig it out or was it loose on the shaft? It is exposed when you remove the prop spacer. Be careful and put it back in. Get yourself a factory manual, it will help alot, and ansewer a lot of questions.
 

Vic.S

Rear Admiral
Joined
May 4, 2004
Messages
4,721
Re: 1979 johnson 9.9 lower unit oil leak

A better diagram from the official parts catalog

http://shop2.evinrude.com/Scripts/I...72\16.TIF&ilSC=36&ilIV=0&ilBR=0&ilIF=P&ilRE=8

and the parts list http://shop2.evinrude.com/Ext/PartList.aspx?assem=41130

Your parts #21 are the oil seals, #2 in this diagram and they are located in the carrier #1.

The spring coil I think is the spring from around the lip of the outermost seal. It is part of the seal! (note these two seals face in opposite directions)

If it was definitely gear oil leaking then these seals will require replacing but "leakage" of unburnt oil from the fuel is normal from around the propeller.
If you have damaged the spring or if it is broken you or cannot get it back into its proper position you will have to renew them anyway

Read http://forums.iboats.com/showthread.php?t=207285

and also http://forums.iboats.com/showthread.php?p=2049494#post2049494
 

cgates56

Recruit
Joined
Aug 15, 2009
Messages
5
Re: 1979 johnson 9.9 lower unit oil leak

Thanks for your help. I will look into your advice.
To answer the questions about the oil: the oil coming out over the prop was hard to diagnose because it was thin, but the motor wasn't run the day or week that this happened so I'm not sure it could be normal exhaust - is this still typical?
As for the oil I drained out of the lower screw - it was completely black, 100% opaque, and did smell bad. I did not see any metal shavings. Does that help? I should also just replace this, via the fill screw, with standard 2 stroke motor oil, correct?
Thanks again for the quick response - this forum is phenomenal.
 

Rick.

Captain
Joined
Jul 30, 2006
Messages
3,740
Re: 1979 johnson 9.9 lower unit oil leak

Get yourself a service manual by OMC for your specific motor and year. You use gear oil in the gear case not two stroke oil. You can try to put the spring back in the seal but my best guess is you probably have ruined the seal and will need to replace it. It sounds to me like your oil leak is just unburned fuel and not from the gear case. Have a look at this article regarding how to pull the gear case apart. I think it is a must read for all us 9.9 and 15 owners. Best of luck. Rick.
http://www.sschapterpsa.com/ramblings/OMC/OMC info.htm
 

cgates56

Recruit
Joined
Aug 15, 2009
Messages
5
Re: 1979 johnson 9.9 lower unit oil leak

Thanks everyone. So it sounds like I need to replace the 2 bearing housing to prop shaft seals. I understand they are identical, and placed back to back. They look extremely thin/compressed around the shaft - to the point where that spring coil was basically forced out of the seal which is why it came out so easily.
So for removing these 2 seals, without pulling the entire shaft/bearing housing out, the sschapterpsa site says a slide hammer will do the trick. Does anyone have any experience with this? And more importantly, with successfully getting new seals back in?
The good news here is I probably will be all set with these 2 new seals and some fresh gear case oil. This is, however, my first encounter with a marine motor so any tips are appreciated.

Side question - I'm looking for a service manual, would the SELOC manual do the trick?
Many thanks
 

petryshyn

Commander
Joined
Oct 3, 2001
Messages
2,851
Re: 1979 johnson 9.9 lower unit oil leak

It will be easier and safer for you to remove the bearing housing. The shaft can stay in...This will also give you the opportunity to change the housing o-ring. The slide hammer/screw trick is OK if you are experienced with it. If you are not careful, you could gouge the housing or shaft causing more leaks. IMO


Cheers
 
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