915 Main Shaft Seal Replacement

[conrad_bookout]

Hello,

Can anyone tell me how to correctly install the 915 main shaft seal? I used a wooden dowel to tap the old seal out of the sleeve (which was a very tight fit), but I'm not sure the best way to go about installing a new seal.

Thanks,

conrad

[Determined]

Hi Conrad,

I'm doing the same project this weekend on my 915, I look forward to the replies.

Thanks,

Alex

[MBEngineering]

HI Conrad
if you have any sockets that are as close to the in side of the guide tube to push the seal in with the vice, if you have acc' to a lathe or a workshop you could get a tool turned up , the main thing is to get the seal on square to the shaft, this is what I have made ,

check in you T/O tube as to the depth of the seal, as you can see I have 2 different length tools to fit the seal



the seal has to fit on to the lip/ridge inside the guide tube,



the tool fitted and the seal will be positioned in a slightly different place on the input-shaft and the inside of the guide tube, so as the oil seal is running on a NON worn part of of the input shaft, use a little lub on the outside of the seal to fit as it is tight in location.



seal fitting position



hope this helps,

regards mike

[conrad_bookout]

I ended up constructing a tool to help accomplish the task. The left end of the picture points to the front of the guide tube/car.



This tool allowed me to press the seal into place from the front of the guide tube while keeping the seal square within the tube. An examination of the seal under magnification indicated that the rear of the seal had more of a bevel, thus the decision to enter backwards from the front. The 1/2 inch washer is small enough to fit inside the guide tube, yet is too large to pass through the hole in the ridge; so once you've tightened the bolt from the rear end, the seal should be positioned on the ridge towards the front - which works for me. I tried several solutions before remembering this little trick my dad taught me as a child.

Parts list:

1/2 inch nut
1/2 x 3 inch machine screw
1/2 inch flat washer (front of tube)
5/8 inch flat washer (rear of tube)

Cost from hardware store $1.87 including tax.

Remember to tighten from rear!

[Determined]

Very impressive and innovative everyone, thank you very much for your input.

Best Regards,
Alex

[RoninLB]

I used 20w dino oil.

I definitely wouldn't use synthetic. The seal may come loose and wind up inside the tranny.

I'm not a pro.