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Differential System - Differentials: Diagnosis Subaru Tribeca WX рестайлинг

Differentials & Drive Axles 7 illustrations ~647 words

INSPECTION

Wash all the disassembled parts clean, and examine them for wear, damage or other defects. Repair or replace the defective parts as necessary.

  1. Hypoid driven gear and drive pinion If there is evidently an abnormal tooth contact, find out the cause and adjust until the teeth contact correctly. Replace the gear if there is an excessive worn or an incapable adjustment. If crack, cutout or seizure is found, replace the parts as a set. Slight damage of some teeth can be corrected by oil stone or the like.
  2. Side gear and pinion mate gear Replace if cracks, scoring or other defects are evident on the tooth surface. Replace if thrust washer contact surface is worn or seized. Slight damages of the surface can be corrected by oil stones or equivalent.
  3. Thrust washer of side gear and pinion mate gear Replace if seizure, cracking, abnormal wear or other defect is evident.
  4. Bearing Replace if seizure, peeling, wear, rust, dragging during rotation, noise or other defect is evident.
  5. Oil seal Replace if deformed or damaged, and at every disassembling.
  6. Differential carrier Replace if the bearing bores are worn or damaged.
  7. Differential case Replace if sliding surfaces are abnormally worn, seized or cracked.
  8. Companion flange Replace if the oil seal lip contact surface shows cracking.

Make sure that there is no leakage from front oil seal portion. If there is any leakage replace the oil seal and inspect the propeller shaft.

Scheme 9

Scheme 9: REPLACEMENT
Scheme 9: REPLACEMENT

Scheme 10

Scheme 10
Scheme 10

Scheme 11

Scheme 11
Scheme 11

Scheme 12

Scheme 12
Scheme 12

Scheme 13

Scheme 13
Scheme 13
  1. Position the select lever to neutral.
  2. Release the parking brake.
  3. Lift up the vehicle.
  4. Remove the oil drain plug, and drain gear oil.
  5. Install the oil drain plug. NOTE: Use a new gasket. Tightening torque: 50 N.m (5.1 kgf-m, 36.9 ft-lb)
  6. Remove the rear exhaust pipe and muffler. Ref. to «REMOVAL»(ref-356700-S05560753212010022700000) , Rear Exhaust Pipe. Ref. to «REMOVAL»(ref-356700-S17752562192010022700000) , Muffler.
  7. Remove the heat shield cover.
  8. Remove the propeller shaft. Ref. to «REMOVAL»(ref-356692-S21930114322010022700000) , Propeller Shaft.
  9. Remove the self-locking nut while holding the companion flange with ST. ST 498427200 FLANGE WRENCH
  10. Extract the companion flange using ST. ST 399703600 PULLER ASSY
  11. Remove the oil seal using ST or screwdriver. ST 398527700 PULLER ASSY
  12. Install a new oil seal with ST. ST 498447120 INSTALLER
  13. Install the companion flange. NOTE: Use a plastic hammer to install companion flange.
  14. Apply seal material to the drive pinion shaft screw threads and the self-locking nut seat surface. Seal material: THREE BOND 1324 (Part No. 004403042) or equivalent
  15. Tighten the self-locking nut within the specified torque range so that the rotating resistance of companion flange becomes the same as that of before oil seal replacement. ST 498427200 FLANGE WRENCH NOTE: Use a new self-locking nut. Tightening torque: 191 N.m (19.5 kgf-m, 140.9 ft-lb)
  16. Hereafter, reassemble in the reverse order of disassembly.
  17. After installing, fill the differential gear oil up to the bottom of the filler plug hole. Ref. to «DIFFERENTIAL GEAR OIL»(ref-356715-S10588153952010022700000) .

Make sure that there is no leakage from side oil seal. If there is any leakage, replace the oil seal.

Scheme 14

Scheme 14: REPLACEMENT
Scheme 14: REPLACEMENT
  1. Remove the rear differential. Ref. to «REMOVAL»(ref-356715-S24606604202010022700000) , Rear Differential (VA-type).
  2. Remove the rear differential side oil seal using a screwdriver wrapped with vinyl tape to prevent the side retainer from scratches.
  3. Using the ST, install the oil seal to the side retainer. ST 398437700 DRIFT
  4. Install the rear differential. Ref. to «INSTALLATION»(ref-356715-S39121961832010022700000) , Rear Differential (VA-type).

Scheme 15

Scheme 15: REMOVAL
Scheme 15: REMOVAL
  1. Disconnect the ground cable from the battery.
  2. Lift up the vehicle.
  3. Support the rear differential using transmission jack, and then remove the rear differential front member.
  1. Check the rear differential front member for damage, bend and corrosion. If damage, bend or corrosion is excessive, replace the rear differential front member.
  2. Check the bushings of rear differential member for cracking, hardening and damage. If cracking, hardening or damage is excessive, replace rear differential front member.
Symptom or troublePossible causeRemedy
1. Oil leakage(1) Worn, scratched, or incorrectly seated front or side oil seal. Scored, battered or excessively worn sliding surface of companion flange.Repair or replace.
(2) Clogged or damaged air breather.Clean, repair or replace.
(3) Loose bolts on differential spindle or side retainer, or incorrectly fitted O-ring.Tighten the bolts to specified torque. Replace the O-ring.
(4) Loose rear cover attaching bolts or damaged gasket.Tighten the bolts to specified torque. Replace gasket and apply liquid gasket.
(5) Loose oil filler or oil drain plug.Retighten and apply liquid gasket.
(6) Wear, damage or incorrect fitting of spindle, side retainer or oil seal.Repair or replace.
2. Seizure NOTE: Seized or damaged parts should be replaced, and also other parts should be thoroughly checked for any defect and should be repaired or replaced as required.(1) Insufficient backlash for hypoid gear.Readjust or replace.
(2) Excessive preload for side, rear or front bearing.Readjust or replace.
(3) Insufficient or improper oil used.Add the recommended oil to the specified level.
3. Damage NOTE: Damaged parts should be replaced, and also other parts should be thoroughly checked for any defect and should be repaired or replaced as required.(1) Improper backlash for hypoid gear.Replace.
(2) Insufficient or excessive preload for side, rear or front bearing.Readjust or replace.
(3) Excessive backlash for differential gear.Replace gear or thrust washer.
(4) Loose bolts and nuts such as hypoid driven gear boltRetighten.
(5) Damage due to overloading.Replace.
4. Noises when starting or shifting gears NOTE: Noises may be caused by differential assembly, universal joint, wheel bearing, etc. Find out what is actually making noise before disassembling.(1) Excessive backlash for hypoid gear.Readjust.
(2) Excessive backlash for differential gear.Replace the differential case assembly.
(3) Insufficient preload for front or rear bearing.Readjust.
(4) Loose drive pinion nut.Tighten to the specified torque.
(5) Loose bolts and nuts such as the side retainer attaching bolt.Tighten to the specified torque.
5. Noises when cornering(1) Damaged differential gear.Replace the differential case assembly.
(2) Excessive wear or damage of thrust washer.Replace the differential case assembly.
(3) Broken pinion mate shaft.Replace the differential case assembly.
(4) Seized or damaged side bearing.Replace.
6. Gear Noise NOTE: Since noises from engine, muffler, transmission, propeller shaft, wheel bearings, tires, and body are sometimes mistaken for noises from differential assembly, be careful in checking them, inspection methods to locate noises include coasting, accelerating, cruising, and jacking-up all four wheels. Perform these inspections according to the condition of trouble. When listening to noises, shift gears into four wheel drive and fourth speed position, trying to pick up only differential noise.(1) Improper tooth contact of hypoid gear.Readjust or replace hypoid gear set.
(2) Improper backlash of the hypoid gear.Readjust.
(3) Scored or chipped teeth of hypoid gear.Replace hypoid gear set.
(4) Seized hypoid gear.Replace hypoid gear set.
(5) Improper preload for front or rear bearings.Readjust.
(6) Seized, cut-away or chipped front or rear bearing.Replace.
(7) Seized, cut-away or chipped side bearing.Replace.
(8) Differential carrier is vibrating.Replace the differential case assembly.
NOTE
Seized or damaged parts should be replaced, and also other parts should be thoroughly checked for any defect and should be repaired or replaced as required.
NOTE
Damaged parts should be replaced, and also other parts should be thoroughly checked for any defect and should be repaired or replaced as required.
NOTE
Noises may be caused by differential assembly, universal joint, wheel bearing, etc. Find out what is actually making noise before disassembling.
NOTE
Since noises from engine, muffler, transmission, propeller shaft, wheel bearings, tires, and body are sometimes mistaken for noises from differential assembly, be careful in checking them, inspection methods to locate noises include coasting, accelerating, cruising, and jacking-up all four wheels. Perform these inspections according to the condition of trouble. When listening to noises, shift gears into four wheel drive and fourth speed position, trying to pick up only differential noise.

INSPECTION CHART

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