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Rear Differential: Other Honda S2000 AP1

Differentials & Drive Axles 21 illustrations ~1162 words

Precautions for Torsen Type Limited-slip Differential (LSD)

  1. The Torsen differentials are mechanical limited-slip differential which delivers the available power to the wheels and the driveshafts with the most grip or resistance as the engine torque output increases.
  2. Do not do repair procedures that require the engine running with one rear wheel raised; such as an on-car wheel balancer.
  3. Do not tow the vehicle with the rear wheels on the ground.
  4. Never dismantle any part of the differential other than the right and left tapered roller bearings.
  5. To optimize the Torsen differential, equip your vehicle with rear tires of the same brand, the same size, and with even wear.

Torsen Type Limited-slip Differential (LSD)

The vehicle uses the Torsen type limited-slip differential (LSD) which is rubber-mounted to the rear subframe.

Construction

  1. The Torsen type LSD assembly consists of the two side gears, eight planetary gears, three side washers, two center washers, the gear case cover, and the gear case.
  2. The planetary gear consists of short and long planetary gears. The long planetary gear meshes horizontally with the side gear. The two planetary gears mesh with the side gears at both ends.
  3. The planetary gears are housed in the pockets of the gear case.
  4. The left and right output shafts are engaged with the side gears.
  5. The Torsen type LSD assembly is a non-serviceable part except the tapered roller bearings. If the Torsen type (LSD) assembly is faulty, it must be replaced as an assembly.

Scheme 70

Scheme 70
Scheme 70

Scheme 71

Scheme 71: Operation
Scheme 71: Operation
  1. Straight-road driving The differential carrier and gears rotate together as a unit when both wheels rotate at the same speed. Turning effort from the ring gear is directly transmitted to both wheels.
  2. When rounding a curve When the vehicle rounds a curve, the differential allows the outer wheel to rotate a little faster than the inner wheel. When this takes place, the short and long pinion gears rotate, and walk around the side gears in the directions shown. If, for example, the right shaft is rotated in a counterclockwise direction with the differential carrier held stationary, the force is transmitted through the right side gear, short pinion gears and long pinion gears to the left side gear, causing the left shaft to rotate in a clockwise direction. This allows the outer wheel to turn more times than the inner wheel when the vehicle goes around a turn.
  3. When limiting differential action

The limited-slip differential acts to limit the differential action when either wheel slips on ice or snow or on turns. This is done by using the friction created between pinion gears and the gear case

  1. The pinions are forced against the gear case by the force as they are rotated and repelled outward.
  2. The ends of the pinion gears are held firmly against the gear case due to the thrust force from the helical gears.

Scheme 72

Scheme 72
Scheme 72

With the pinion gears locked, the torque applied to the slipping wheel is reduced and the torque applied to the other wheel is increased.

Scheme 73

Scheme 73: Differential Fluid Inspection and Replacement
Scheme 73: Differential Fluid Inspection and Replacement

Scheme 74

Scheme 74
Scheme 74
  1. Raise the vehicle on a lift.
  2. Remove the filler plug (A) and the sealing washer (B), then check the condition of the fluid, and make sure the fluid is at the proper level (C).
  3. The fluid level must be up to the fill hole. If it is below the hole, add the recommended fluid until it runs out. If the fluid is dirty, go to step 4. If the fluid is not dirty, reinstall the filler plug with a new sealing washer.
  4. Remove the drain plug (A) and the sealing washer (B), and drain the fluid.
  5. Clean the drain plug, then reinstall it with a new sealing washer, and refill the differential with the recommended fluid to the proper level. Fluid Capacity 0.74 L (0.78 US qt), at fluid change 0.77 L (0.81 US qt), at overhaul Recommended Fluid Hypoid gear oil API classification: GL5 or GL6 Viscosity: SAE 90
  6. Reinstall the filler plug (C) with a new sealing washer (D).

Scheme 75

Scheme 75: Differential Removal
Scheme 75: Differential Removal

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Scheme 83
Scheme 83
  1. Raise the vehicle on a lift.
  2. Remove the rear wheels.
  3. Lift up the locking tab (A) on the spindle nut (B), then remove the nut.
  4. Remove the cotter pin from the lower arm ball joint castle nut, then remove the castle nut. Then separate the ball joint from the lower arm using the ball joint thread protector and the ball joint remover (see step 12 on «EXPLODED VIEW»(ref-351953-S40975997962009122900000) ). NOTE: To avoid damaging the ball joint, install the ball joint thread protector onto the threads of the ball joint. Be careful not to damage the ball joint boot when installing the remover (see «BALL JOINT REMOV AL»(ref-221354-S20922790902006022400000) ).
  5. Remove the wheel speed sensor harness (A) from the upper arm.
  6. Make reference marks (A) across the inboard joint (B) and the output shaft of the rear differential (C).
  7. Remove the six inboard joint mounting bolts (D) and nuts (E), then remove the inboard joint from the rear differential.
  8. Drain the differential fluid (see «DIFFERENTIAL FLUID INSPECTION AND REPLACEMENT»(ref-351952-S08750565382009122900000) ).
  9. Remove the propeller shaft (see «PROPELLER SHAFT REMOVAL»(ref-221351-S33969017042006022400000) ).
  10. Remove the rear suspension stiffener (A).
  11. Remove the evaporative emission (EVAP) canister cover (A). '00-05 models '06-09 models
  12. Place a transmission jack under the rear differential.
  13. '00-05 models: Remove the four differential mount bracket B mounting nuts. '06-09 models: Remove the four differential mount bracket B mounting nuts. Then remove the differential breather box (see «DIFFERENTIAL BREATHER BOX REPLACEMENT»(ref-351952-S27228708752009122900000) ).
  14. Remove the four differential mount bracket A mounting bolts.
  15. Lower the rear differential on the transmission jack.
  16. Remove right and left differential mount bracket A from the differential; '00-05 models (see «DIFFERENTIAL MOUNT REPLACEMENT»(ref-351952-S13874629102009122900000) ), '06-09 models (see «'06-09 MODELS»(ref-351952-S06665666282009122900000) ).

Scheme 84

Scheme 84: Differential Case Assembly Removal and Installation
Scheme 84: Differential Case Assembly Removal and Installation

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Scheme 89
Scheme 89
  1. Remove the output shafts (A) from the differential using pry bars (B).
  2. Remove the ten mounting bolts in a crisscross pattern in several steps, then remove the differential case (A).
  3. Clean the dirt and oil from the mating surfaces. Apply liquid gasket, P/N 08718-0001 evenly to the mating surface of the differential case and the differential carrier. Install the component within 5 minutes of applying the liquid gasket. NOTE: If you apply liquid gasket P/N 08718-0012, the component must be installed within 4 minutes. If too much time has passed after applying the liquid gasket, remove the old liquid gasket and residue, then reapply new liquid gasket. Allow it to cure at least 30 minutes after assembly before filling the differential with the recommended fluid.
  4. Install the differential case (A) with the ten mounting bolts finger-tight.
  5. Tighten the ten mounting bolts in a crisscross pattern in several steps. Specified Torque: 24 N.m (2.4 kgf.m, 17 lbf.ft)
  6. Replace both clips (A) on the output shafts. Make sure the clips are installed in the output shaft grooves (B).
  7. Install the output shafts (A) into the differential. A

Scheme 90

Scheme 90
Scheme 90

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