TM 10-3930-659-34 5-16. REAR AXLE FRONT OSCILLATING SUPPORT YOKE, INPUT QUILL, AND PINION SHAFT MAINTENANCE (Con’t). 6. Measure length (34) of tooth pattern (33). 7. Tooth pattern (33) must start 0.12-0.52 in. (3.05-13.21 mm) from toe end of bevel pinion (31). WARNING Prussian blue dye is poisonous and can burn skin on contact. Always wear protective goggles and gloves, and use only in a well-ventilated area.  Overexposure  to  Prussian  blue  dye  can  cause  serious  heart  and skin problems, dizziness, and unconsciousness if not handled properly. 8. Apply a light coat of Prussian blue dye to several teeth of ring gear (32). 9. Roll  bevel  pinion  (31)  and  ring  gear  (32)  back and  forth  six  times  to  obtain  good  tooth  contact pattern (33). 10. Repeat  steps  8  and  9  in  three  locations,  1200 apart.   If   tooth   pattern   (33)   is   still   not   within specification,  add  or  delete  shims  as  necessary (see paragraph 5-17). 11. Clean  Prussian  blue  dye  from  bevel  pinion  (31) and ring gear (32). 12. Apply  a  light  coat  of  lubricating  oil   to   teeth   of bevel pinion (31) and ring gear (32). 13. Install differential cover (see paragraph 5-17). FOLLOW-ON TASKS: • Install rear axle assembly (see paragraph 4-48). 5-163