# Pinion seal, replace.

Remove differential or driveshaft. |
Clean front of differential to prevent contamination of bearings. |
Use a chisel to crimp locking washer on pinion nut. Pull locking washer off nut. |
Use a chisel to stake the nut and end of the pinion shaft to mark position of nut. |
Remove nut. |
Slide off pinion flange. Inspect flange for damage. |
Pry out seal, take care to not damage the housing. |
Clean old oil from housing, inspect housing for damage on seal surface, correct if necessary. |
Apply a small amount of RTV sealer to the outer edge of the new seal. |
Install new seal in housing until it is flush with housing lip. |
NOTE: If pinion flange has a groove from running against the old seal, counter sink new seal to prevent seal running in the existing groove. |
Lightly lubricate surface of flange with oil. |
Install flange, use Loctite™ 262 on pinion nut and tighten only until chisel marks are aligned. |
WARNING: Over tightening of pinion nut will result in failure of pinion bearing. |

E30 M3 Repair Manual V2.7. Copyright ©1999-2001 Koala Motorsport & Brett Anderson