Pre-Disassembly Inspection

Before disassembling the front final drive, perform the following inspection.

Total Preload 

1. Place the front final drive onto the attachment and secure it.
2. Drain the final drive oil.
3. Remove the carrier cover.
   CAUTION: When the carrier case is damaged, replace the final drive assembly.
   Fig 1: Identifying Carrier Cover Bolts

   Courtesy of NISSAN MOTOR CO., U.S.A.
4. Turn the companion flange in both direction 20 times or more to seat the bearing rollers.
5. Check total preload with special service tool.
   Fig 2: Checking Total Preload With Special Service Tool

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

   Tool number: ST3127S000 (see J25765-A) 

   Total preload: 1.56 - 2.65 N.m 

   (0.16 - 0.27 kg-m, 14 - 23 in-lb) 

• If the preload value is out of standard, adjust pinion bearing preload and side bearing preload.

Condition	Action
If the preload value is too large:	Decrease the drive pinion bearing adjusting washer thickness.
	Decrease the drive pinion adjusting washer thickness.
	Increase the side bearing adjusting shim thickness.
If the preload value too small:	Increase the drive pinion bearing adjusting washer thickness.
	Increase the drive pinion adjusting washer thickness.
	Decrease the side bearing adjusting shim thickness.

Drive Gear To Drive Pinion Gear Backlash 

Set the dial gauge to the drive gear face and measure the backlash.

Standard drive gear backlash 

: 0.10 - 0.15 mm (0.0039 - 0.0059) in 

If the measured value is out of standard, adjust the backlash by replacing the side bearing adjusting shim (differential case side).

• If the backlash too large, decrease side bearing adjusting shim thickness.
• If the backlash too small, increase side bearing adjusting shim thickness.

Drive Gear Runout 

1. Set dial gauge to behind the drive gear and measure the ring gear runout.

   Runout limit: 0.05 mm (0.0020 in) or less 

   Fig 4: Setting Dial Gauge To Behind Drive Gear And Measuring Ring Gear Runout

   Courtesy of NISSAN MOTOR CO., U.S.A.
   1. If the runout is exceed limit, check for drive gear assembly:
      • any object between the drive gear and differential case
      • deformed differential case
      • deformed drive gear
   2. If drive gear is deformed, replace the drive gear and pinion gear as a set. If the differential case is deformed, replace the differential case.

Companion Flange Runout 

1. Set the dial gauge to the companion flange face and measure runout.
   Fig 5: Setting Dial Gauge To Companion Flange Face And Measuring Runout

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

   Runout limit: 0.18 mm (0.007 in) or less 

2. Set the dial indicator to the inside face of the companion flange and measure the runout.

   Runout limit: 0.13 mm (0.005 in) or less 

   CAUTION: Clean inside face of companion flange before measuring runout.
   1. If runout is out side limit, remove the companion from the drive pinion. Turn the companion flange position 90° each, and measure the runout again.
   2. If runout valve still out side of the limit, replace companion flange.
   3. If runout valve still out side of limit after replacing companion flange, check pinion bearing and drive pinion assembly, and pinion bearing damage.

Tooth Contact 

Check tooth contact. Refer to TOOTH CONTACT INSPECTION  .