Tooth Contact Inspection: Notes

Checking gear tooth contact pattern is necessary to verify correct relationship between drive gear and drive pinion.

Hypoid gears which are not positioned in proper arrangement may be noisy and/or have a short life. Check gear tooth contact pattern to obtain the best contact for low noise and long life.

1. Thoroughly clean drive gear and drive pinion teeth.
2. Lightly apply a mixture of powdered ferric oxide and oil or the equivalent. Apply it to 3 or 4 teeth on the drive side of drive gear.
3. Hold companion flange steady by hand and rotate the drive gear in both directions.
   Fig 1: Cleaning Drive Gear And Drive Pinion Teeth

   Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check the tooth contact on both sides (drive side and coast side).
   NOTE: Refer to TOOTH CONTACT PATTERN AND HEIGHT ADJUSTING WASHER SELECTION  for detail of tooth contact pattern.
   Fig 2: Checking Tooth Contact On Both Sides (Drive Side And Coast Side)

   Courtesy of NISSAN MOTOR CO., U.S.A.