Replacing Seals

higenius

Cadet
Joined
Jun 23, 2002
Messages
9
I need to replace seals on my lower unit. I already replaced the drain plug gaskets. It still leaks. Are seals easy to replace or should I take it to a mechanic. I replaced the impeller and got the motor back together, but I'm guessing that seals are much more involved.<br /><br />The motor is a 1963 Mercury 850 (85hp) Long Shaft.
 

12Footer

Fleet Admiral
Joined
Mar 25, 2001
Messages
8,217
Re: Replacing Seals

Well it's a little more trouble than replacing the impeller, but not much PROVIDED you have the right tools.You'll need iether a factory-made seal puller (about 10 buks)or make your own,if you have the facilities for that. You'll need a piece of pipe, the same diameter as the seals,to press the new ones in. You'll also need the shop manual, a gauge on an air hose, with a vent/fill screw hole fitting,to pressure test the lower unit (to make sure you got a good seal on everything). These are fairly easy to make,using a 0-30PSI air pressure gauge,and an air hose with threaded fitting, or a bicycle air pump with gauge and threaded fitting.<br />The hardest part of the whole job,is getting ALL of the old seals out,without getting anything in the gearcase, and the clean-up of the mounting surfaces.<br />Look at it this job from another perspective..A seal kit will cost 30buks or so, and the cost of the tools you don't currently own,the shop manual..You'll probably have 75buks in the thing max (including l/u juice)...Take it to a shop, it's down for a week or so, and you'll be out 250buks, if you take the l/u to them. Add 100 for them to work on the mounted unit.<br />If you fail (and it's not likely, if you take your time, go by the book, and get all questions answered here), you'll be out the cost of another seal kit,l/u lube you had to dump,and two screw gaskets.<br />Not a bad learning curve,really. And you'll have the pride in "making it go again"...Nothing like that feeling ;)
 

higenius

Cadet
Joined
Jun 23, 2002
Messages
9
Re: Replacing Seals

Thanks again 12footer. Where is the cheapest place to pick up the factory-made seal pullerand seal kit?
 

Dewey

Seaman
Joined
May 24, 2002
Messages
69
Re: Replacing Seals

if you dont have pipe to put new seals in then large socket sets will work. I had a heck of a time removing the prop shaft seal in my 1960 sea king. Good luck.
 

Dewey

Seaman
Joined
May 24, 2002
Messages
69
Re: Replacing Seals

I got a seal kit from napa for 22 bucks. it may vary a little because of different motors.
 
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