Mercury outboard tilt and trim seal replacement

1994 Mercury Outboard 115 HP single ram tilt and trim seal replacement

[@davidhedayi5585]

Thanks for the video. For those asking why not remove the whole thing and work it’s really not necessary. It’s also nice to have the motor mounted to remove the top cap with spanner wrench to give you leverage and torque. One thing is that it’s fairly common to have everything work fine but have a slow leak from the top seal and makes a mess under it. You also lose function of trim even you lose enough fluid. With that said if you go thru all this you need to remove the three t20 screws and replace the internal seal on the top cylinder cap.

[@darrenmarrable2530]

Nice work on the trim ram mate. Thanks for making it simple.

[@TimsWorkshopTJY]

Good video but let me add when removing the motor there is a small drive gear that will fall out. I lost mine but made a new one from a allen wrench. That's all it was anyway. Another thing is there is more o-rings too on these parts. The top cap has a inside o-ring as well. To get the top cap off to replace the inside o-ring the bottom piston needs to be removed. It has a plate with three star screws but be careful removing it because there is small springs on 5 locations ball seats and bearings to remove and put in a bag so they don't get lost. Put the rod in a vise and use the pin spanner to remove that piston the same way as the top cap. Now you can remove and replace all the outer and inner o-rings plus the last memory piston that this video shows to pop out. When you put the bottom piston back on the rod lock tight as required per the mercury maintenance manual.

[@SuperPaako]

Thanks to this video i did it. I used a spanner wrench ( a must). Dave is correct that one can use the power up to push out the main piston, but i added ATF to get it to pressure up,. I also used a rubber mallet and hit the case at the point of the piston. Yes it popped out. Ok the seals were hard (old) and the main piston seal had about five scratches on that piston. so i would say that you got to replace all 3 seals. I got to get the fluid and bleed. I would get the mercury fluid and not use ATF, mercury is clear. Thanks Dave.

[@sircharlesmitchell5393]

Thank you,

[@jasonkarls2384]

When I popped out the 3rd O-ring, I "ever so gently" used the power up tilt to pop it out. Wouldn't budge at first, but when it did, whoa, came out at warp speed and could've killed. So be careful with that way to get that bottom one out.

[@ryandrury6102]

What size is your motor because your tilt trim looks like the same size as mine. My motor is a 40 hp mercury force outboard. I need to replace the top gasket leaking fluid out of the top. I really like your videos.

[@Rjkonop15]

How’d you get the second seal off the ram?

[@edwardh1003]

Do you happen to have a part number for the replacement seals? I am working on a 91 Mercury 100.

[@stanleynelson7375]

You can change the very top seal the one in the cap you can get the seal kit off of 5 star Marine

[@hunter6099]

Always fill to the top before putting it back on.

[@geneneill530]

This was almost a fantastic video. But I'm sitting here screaming at you to AIM THE CAMERA AT THE PART YOU ARE TALKING ABOUT ("this little part right HERE ...") but you keep on not listening to me! Nevertheless, the video was helpful, so you get a like. Thanks. :)

[@denispoirier5442]

If the hydraulic cylinder doesn't leak , is it still necessary to change the seals ? The motor is over 20 years old.

[@richardruiz302]

How do you remove the bottom ram if it will not power up with motor?

[@mikeboston421]

not easier to pull the whole thing off the motor so its free of everything to work on?

[@elmundodeunicorniomiagabri5671]

Estaría bueno saber cómo de sarmaste el vastago

[@jerrysuarez4922]

Price on parts ?

[@chrism6575]

STEADY CAM!