115hp Optimax Shift Spline Issue

[dan111]

Hey,

Motor is a 2011 Mercury Optimax 115hp
Serial is 1B863978

Ive attached two photos of the problem. I was removing the lower unit when i noticed it was split. Chances are i caused or broke the piece. Any advice greatly appreciated.

Thanks

[dan111]

To me it looks like if it cant be jb welded back together, i would need a whole new driveshaft housing.

Its strange that it doesnt slot back in nicely


Does anyone have a similar 75/90/115 opti that they could post a picture of in this area?

[JOE54]

I know its a broken piece on your engine but purly cosmetic,wont hurt a thing

[mtsaz]

I have 115 optimax- I am trying to figure out where this piece is so I can post a pic.

[dan111]

Thanks for the responses. Another merc mechanic mentioned the same thing, wont hurt to drive it as is. But that the repair is a new driveshaft housing.

[dan111]

I was reattaching the lower unit. Tried in F and R to align the splines. Well no wonder i had issues, the lower units shaft doesnt even fit into the coupler. Can the couplers grooves be filed to make it fit the lower units shaft? Neither the shaft or the coupler look like their damaged.

I tried looking on a parts schematic and couldn't find this part, did Mercury change it by any chance?

[JOE54]

43585/ likely bur from install, might try a small file

[dan111]

Filed it for a few minutes, fit right in. Had the boat out yesterday, all works. Thanks again. Siliconed that broken piece in and its solid as well.

[JOE54]