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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1770 (Rear Drive Axle) >> Repair Instructions >> Differential Housing Cleaning and Inspection >> Bearings and Races Clean and Inspect

Bearings and Races Clean and Inspect

WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Inspecting Bearing Rollers & Races For Pitting, Grooves, Spalling & Excessive Wear
    GM1465Courtesy of GENERAL MOTORS CORP.
  1. Inspect the bearing rollers and races for the following:
    • Pitting
    • Scoring or grooves
    • Excessive wear or other damage
    2. Fig 2: Inspecting Bearing Rollers & Races For Heat Discoloration
    GM1458Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Bearing races with a sign of hear discoloration must be replaced.
  2. Inspect the bearing rollers and races for heat discoloration. Heat discoloration ranges from a faint yellow to a dark blue color. This discoloration may result from an overload or improper lubrication. Excessive heat causes softening of the rollers and races.
    3. Fig 3: Inspecting Pinion Flange Sealing Surface
    GM734843Courtesy of GENERAL MOTORS CORP.
  3. Inspect the pinion flange sealing surface (1) for wear, damaged bolt threads (2) and worn or damaged splines (3).
    4. Fig 4: View Of Clutch Drum
    GM792801Courtesy of GENERAL MOTORS CORP.
    NOTE: Do not submerge the clutch drum in solvent. This will damage friction material and geroter pump.
    IMPORTANT: The clutch drum is not serviceable. If inoperative conditions are found, replace the unit.
  4. Wipe with a clean lint free towel and inspect the following:
    • The pinion nut threads (1)
    • The pinion splines (2)
    • The bearing surface (3)
    • The front sealing surface (4)
    • The rear sealing surface (5)
    5. Fig 5: Replacing Differential Carrier Assembly
    GM792805Courtesy of GENERAL MOTORS CORP.
  5. Clean the differential case in solvent.
  6. Inspect the following for cracking or scoring.
    • The side bearing mounting surfaces (1)
    • The differential pin bores (2)
    • The ring gear mounting surfaces (3)
    • The side and pinion gear thrust washer 7/16 surfaces (4)
  7. Replace the differential carrier assembly as necessary.
    8. Fig 6: Cleaning Parts In Solvent
    GM792811Courtesy of GENERAL MOTORS CORP.
  8. Clean the following parts in solvent.
  9. Inspect the following for scoring, pitted teeth and cracks:
    • Side gear thrust washers (1)
    • Side gears (2)
    • Pinion gear thrust washers (3)
    • Pinion gears (4)
    • Pinion shaft pin (5)
    • Lock pin (6)
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