News

2021 Force Gurkha: Fixing a leaky rear differential oil seal

Rear Differential oil seal was leaking from day one, but it was minor wetting just around the flange initially, it got worse over time so thought of replacing the seals.

BHPian PhantomLord recently shared this with other enthusiasts.

Rear Differential oil seal was leaking from day one, but it was minor wetting just around the flange initially, it got worse over time so thought of replacing the seals.

Differential flange slotted nut is straight out of 1979 MB, so had to make a tool like I did for wheel bearing. There is not much leverage for removal,made a socket based tool to be used with impact wrench. Socket size is 30mm, just cut the fingers matching the nut slot and flame harden it.

MB W46x had this slotted nut for rear axle as well

124 differential nut uses same thread and size, since I had spare one and proper tool thought of using it for easier future maintenance. Both nuts are exactly 14mm height(in case you plan to use thread marking to set the friction torque).

MB differential nut, 124 flange with Gurkha's seal and MB nut removal tool.

MB part number, MB nut on right side is rear axle nut which is same size but has larger contact surface.

You need puller to get flange out, mine was loose though.

There are two seals, oil was trapped between seal one and two, guessing inner seal gave up.

Flange surface was good, leak was due to damaged rubber seal. (Flange size is same as 124)

Cleaned and ready for assembly, it is recommended to use sealant on outside of the seal.



All done, friction torque setting has elaborate procedure to copy from exiting setting. But exiting setting on mine was loose, so just hand tightened + 1/8 turn (Overall goal here is to be as loose as possible without slack).

Shaft catcher protrudes a bit below rear differential, bent it to tuck in.

Greased all the 3 shafts while in there, just in case if it was missed from factory.

Steering Hose fouling radiator hose is known issue, I did not face the issue but mine was quite close. Primary issue looks like Adhoc design to accommodate routing of steering hose from pump to reservoir, to correct this issue reservoir mount is made adjustable in all direction. To increase gap, reservoir needs to be moved towards the engine but mounting clamp design limits this. However you can adjust it to create more gap.

Before and After, make sure to loosen all joints before adjusting reservoir position , else it will add tension to hose.

Read BHPian comments for more insights and information.

 
Got BHP?