OMC sterndrive upper gearcase seal replacement

[shughes12]

I need to to do the seals and impeller in the upper gearcase on my omc sterndrive but I can only find info on the cobras. Wondering if its similar and if I can use those videos. Thank you

 

[southkogs]

Nope

Are you sealing the entire gear case, or just changing the impeller/raw water pump?

 

[Scott Danforth]

for stringer 400 and 800 videos and information, look here. http://sterndrive.info/

 

[shughes12]

Nope

Are you sealing the entire gear case, or just changing the impeller/raw water pump?

Water was getting in so I was told I needed to do the seals for the upper gear case and to do the impeller

 

[southkogs]

From what I understand those uppers can be a bit of a booger without the right tools. I never went into mine. Maybe kenny nunez can offer some guidance.

 

[Scott Danforth]

you will need the right tools, and most importantly, the experience to use them. especially if you have to replace a bearing (which nearly always happens if you get water in the gear box).

 

[Redrig]

Assuming the gears and or bearings are all good and not toast . You dont need any special tools on the upper to just reseal it . I have done mine twice.

The lower unit does need special tools to reseal though, you'll need big snap ring pliers and special tool 311875 to grip the vertical shaft while you torque it down .

I would just start with removing the drive, which is easy on a stringer , split the lower and upper and then pressure test to see if you can pinpoint the leak.

Plus the benefit of splitting the upper and lower, it gives you a chance to inspect / regrease all of the splines on the shafts.

 

[kenny nunez]

One way to hold the gearcase in a vise is with the quadrant gear. Just be real careful not to break any of the 4 bolts that mount the ball gear shaft retainer.
If the 1& 1/8th “ nut is rusted and the socket will not grip it then use a chisel and hammer to break it loose. After the ballgear shaft is out bight the shaft in a vise and hit the ball gear in a circular motion to break the Loctite loose.