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Is the oil leaking from the seals directly behind the propeller?
That is not too bad of a job, but you do have to remove the whole bearing carrier and the propeller shaft.
You will remove the propeller and thrust hub, then the 3 screws you can see in there to get the plate off. Then you need a puller to pull the bearing carrier out, drive out the seals, and install the new ones. The inside seal goes in with the hollow side facing the out. Then fill the hollow side of both seals with grease, and the second one goes in with the hollow side facing in.
Reverse the steps above to reassemble.
Make sure the drive is full of oil, and check it for signs of water in the oil. If there is no water, and you fill it, and you keep an eye on it, so you can stop using it if you see water show up in the oil, then yep, you can.
Just check the oil when you have th ability. when the boat is going to go into the water and when you take it out.
ok, This one is even easier. just two bolt, puller to get it out seals go in the same way.
I have included an exploded view for you.
You will unbolt the two bolts #20, and then use a puller to remove number 15 from the gearcase, which you can leave attached to the rest of the motor.
You just have to pull #15 off the prop shaft so you can get the seal out. You can leave the prop shaft in the lower unit.
looks like yours is only one seal.
I just realized that we are talking about a 25 hp motor. You wont need a puller at all. Those little ones can be pulled right out/
I wouldn't lie about that. It's gonna' fight you some, don't worry about that. You have to try to keep it pulling straight out without it trying to bind up.
But on a large motor, now and then I can pull one out without a puller. They are not jammed in there, you just can't get a grip on them. When using the puller you almost don't have to.
And the bigger ones require a locking ring that takes 200 ft lbs of torque.
Pull the carrier, drive the seal out. Pack the new seal with grease and drive it in till it seats wipe out any debris from the opening, lube the lip of the seal and the big O ring seal with gear lube and slide the carrier back into place. Put the two bolts on.