my 2007 mercury 25hp efi is leaking gear oil from the prop.no water detected yet.how do i fix this problem. is it a hard fix?
Make (of engine): mercury
Model (of engine): 1-a25203f k
took the prop off visually see slight leak from behind prop.
Thank you for using our site, My name is XXXXX XXXXX X will be helping you with your problem.
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.
mine only has 2 screws??
Then can I have the serial number to bring up the correct one and give you the correct directions?
OR201734 can i run it like this for one more weekend in salt or fresh water.
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.
ok im a idiot?are you saying i have to have a puller and take the whole bottom foot off and drive out the seals and bearings to complete this job?simple for you but i need to see it done first is there a video of doing this that you know of or a simpler way of explaining the job that looks like a lot of stuff coming off to change 2 seals.i work on stihl chain saws alot but i have not ever worked on a drive for a boat engine.
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.
12 years Certified marine mechanic, performance boat builder
one more stupid ? what kind of puller do i need? is it something specific to my motor and is it only one seal?
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/
youve been really good but now im wondering are you pulling my leg?nothing hardly ever is that simple.take the prop off take the 2 bolt plate off. take the seal off.grease the inside channel.put the seal back in place.reasimble the prop and go?and ofcourse put new oil in.
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.