Differential Rebuild - Front

Complete disassembly, inspection, and rebuild of the front differential on a FWD 2018-2024 Honda Accord 1.5L Turbo, including bearing and seal replacement.

Warnings

Tools required

Parts

• Differential bearing set (side bearings and pinion bearings) × 1 — Use OEM specification
• Differential seal kit (input shaft seal and axle seals) × 1 — Use OEM specification
• Drain plug crush washer × 1 — 94109-20000
• Fill plug crush washer × 1 — 94109-20000
• Honda Bond HT or equivalent RTV sealant × 1 — 08718-0004
• Differential side gear shims (assorted) × 1 — Use OEM specification
• New axle nuts × 2 — 90305-T2F-A01

Fluids

• Honda DW-1 ATF — 2 qt

Preparation

1. Park vehicle on level surface and engage parking brake
2. Raise and support vehicle securely on jack stands at manufacturer lift points
3. Remove both front wheels
4. Drain differential fluid by removing drain plug and allow to fully empty into drain pan
5. Clean exterior of differential housing and surrounding area to prevent contamination during rebuild

Procedure

1. 1

   Remove halfshafts from differential
   Remove brake calipers and hang with wire to prevent brake hose damage. Remove axle nuts (have helper apply brakes or use breaker bar with vehicle weight on ground before lifting if not already removed). Support halfshafts and remove CV bolts connecting inner CV joints to differential output flanges. Carefully pull halfshafts from differential to prevent damage to seals. Cap differential outputs to prevent fluid loss and contamination.
2. 2

   Remove differential from transaxle
   Support transaxle with jack. Remove differential cover bolts and carefully separate cover from housing using plastic pry points (do not damage sealing surfaces). Remove fill plug. Mark ring gear position relative to differential case with paint marker. Remove differential assembly by pulling straight out from transaxle housing. Place on clean workbench.
   ⚠Differential assembly weighs approximately 25-30 lbs. Use proper lifting technique to prevent injury.
3. 3

   Disassemble and inspect differential carrier
   Before disassembly, measure and record ring gear backlash at four points 90 degrees apart using dial indicator (specification is 0.10-0.18mm). Record bearing preload. Remove ring gear bolts and separate ring gear from differential case (may require gentle heating of ring gear to 100°C). Mark side bearing locations (left/right). Remove side bearings using bearing puller. Remove differential pinion shaft retaining pin, slide out pinion shaft, and remove pinion gears and side gears while noting shim positions and thicknesses.
   ℹ️Keep all shims organized and labeled by location. Original shims may be reused if within specification.
4. 4

   Inspect all components for wear
   Clean all parts thoroughly in solvent. Inspect ring gear and pinion teeth for scoring, pitting, or abnormal wear patterns. Check differential case for cracks or damage. Inspect pinion and side gear teeth for wear. Measure side gear thrust surfaces and pinion gear bore for wear. Check bearing races in housing for pitting or scoring. Replace any components showing damage or wear beyond service limits. Check ring gear runout (max 0.05mm) by mounting on case and measuring with dial indicator.
5. 5

   Install new bearings on differential case
   Heat new side bearings to approximately 100°C in oil bath or bearing heater (do not exceed 120°C). While bearings are hot, quickly press or drive onto differential case hubs using proper bearing driver matched to inner race diameter. Ensure bearings seat fully against case shoulders. Allow to cool completely before handling.
   ⚠️Heated bearings are extremely hot. Use heat-resistant gloves and proper handling tools. Do not use open flame or heat gun.
6. 6

   Reassemble differential gears with shims
   Install side gears into differential case with original shims as starting point. Install pinion gears and rotate to mesh with side gears. Install pinion shaft and temporarily secure. Measure side gear backlash using dial indicator through case window - specification is 0.05-0.15mm. Adjust shim thickness behind side gears to achieve proper backlash. Once correct, install pinion shaft retaining pin securely.
7. 7

   Install ring gear to differential case
   Heat ring gear to 100°C in oil bath. Quickly align ring gear to case using alignment marks made during disassembly. Install ring gear bolts and tighten in star pattern in three stages: first to 50%, then 75%, then final torque per Honda service specification (typically 98 Nm, but verify in service manual as not provided in torque spec list). Allow assembly to cool completely.
   ⚠Ring gear bolts are critical fasteners. If torque specification is not available, do not proceed without consulting official Honda service manual.
8. 8

   Install new seals in transaxle housing
   Remove old differential seals and axle seals from transaxle housing using seal puller or pick. Clean seal bores thoroughly and inspect for damage. Coat outer diameter of new seals with small amount of ATF. Drive new seals into housing using appropriately sized seal driver, ensuring seals are seated squarely and fully to proper depth. Install input shaft seal using same method.
9. 9

   Set bearing preload and install differential
   Install differential assembly into transaxle housing, carefully guiding side bearing outer races into position. Check that assembly rotates smoothly. Measure bearing preload by rotating differential with inch-pound torque wrench - specification should be 0.5-1.0 Nm (4-9 in-lb) for new bearings. If preload is incorrect, adjust shims behind bearing races as needed.
10. 10

    Verify final gear backlash
    With differential installed, mount dial indicator to measure ring gear backlash. Check at minimum four points around ring gear circumference. Backlash should be 0.10-0.18mm and should not vary more than 0.05mm between measurement points. If backlash is incorrect or varies excessively, remove differential and adjust side bearing shim thickness as required.
11. 11

    Install differential cover with RTV sealant
    Clean all old RTV from differential cover and transaxle housing mating surfaces using scraper (do not gouge aluminum). Clean surfaces with brake cleaner and allow to dry completely. Apply continuous 3mm bead of Honda Bond HT RTV sealant to cover mating surface, circling inside of all bolt holes. Install cover within 5 minutes of applying RTV. Install cover bolts and tighten in criss-cross pattern to specification.
    ℹ️Allow RTV to cure for minimum 30 minutes before filling with fluid. Full cure time is 24 hours.
12. 12

    Fill differential and install halfshafts
    Install drain plug with new crush washer and torque to specification. Remove fill plug and fill differential with Honda DW-1 ATF until fluid reaches bottom of fill hole (approximately 1.5-2.0 quarts). Install fill plug with new crush washer and torque to specification. Clean halfshaft splines and apply thin coat of ATF. Install halfshafts into differential output seals, being careful not to damage seals. Install CV bolts and torque to specification.
13. 13

    Final assembly and torque verification
    Install brake calipers and torque mounting bolts per specification. Install new axle nuts (these are one-time-use fasteners) and torque to specification. Install wheels and lower vehicle to ground. With full vehicle weight on wheels, perform final axle nut torque verification.
    ⚠Axle nuts must be replaced with new fasteners. Reusing old axle nuts can result in nut loosening and wheel separation.

Reassembly

1. Torque all fasteners to specified values using calibrated torque wrench
2. Verify axle nuts are properly torqued with vehicle weight on ground
3. Double-check that all drain and fill plugs are installed with new crush washers
4. Ensure no tools or parts are left in wheel wells or under vehicle

Verification

• Start engine and allow to idle, then shift through all gear ranges to circulate fluid through differential
• Check for fluid leaks around differential cover, drain plug, fill plug, and axle seals
• Test drive vehicle at low speed and verify smooth operation with no binding, clicking, or abnormal noise from differential
• After 50-100 miles, recheck differential fluid level and inspect for leaks
• Listen for whining, humming, or growling noises that would indicate improper gear mesh or bearing preload
• Monitor differential temperature after test drive - excessive heat indicates problem with bearing preload or insufficient lubrication

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