TM  10-3930-643-34 GENERAL  SUPPORT  ENGINE,  FUEL,  EXHAUST  AND  COOLING  MAINTENANCE. 13-6. Rear Oil Seal. (Sheet 2 of 6) REMOVAL NOTE Be careful not to damage the seal bore in the flywheel housing. 1. Using a brass and hammer, split oil seal (1) and remove from flywheel housing  (2). Discard oil seal (1). NOTE Be careful not to damage the crankshaft  flange  when removing the wear sleeve. 2. Using a muffler tool and hammer, cut wear sleeve (3) and remove from flange of crankshaft (4). Discard wear sleeve (3). Go to sheet 3 13-39