Autopapyrus · Kia Sportage II (KM)
https://autopapyrus.com/guides/kia/sportage/rear-differential-repair-bearing-replacement-and-ring-and-pinion-adjustment/
https://autopapyrus.com/guides/kia/sportage/rear-differential-repair-bearing-replacement-and-ring-and-pinion-adjustment/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.
Kia Sportage II (KM): Rear Differential Repair, Bearing Replacement and Ring-and-Pinion Adjustment
The rear differential on the Sportage KM drives the rear wheels via the driveshaft. Typical reasons for repair: howling or humming under acceleration and deceleration, play in the flange, a leaking seal. The main rule of this repair: after replacing the bearings, you must reset the bearing preload and the ring-and-pinion backlash. Without this, the gears will fail quickly. If you don't have special tools and measuring experience, it is safer to take the job to a shop that specializes in differentials. Check the factory specifications for preload and backlash for this model before assembly. The values below are given as a general principle.
Diagram: where the rear differential, driveshaft and mounting bolts are
Tap to enlarge
- 1Driveshaft: a tube entering the differential through a rubber boot. Disconnect it from the differential flange and secure it aside.
- 2Flange on the pinion shank: a small plate with holes. Paint-mark the flange and shaft before disassembly; note the nut tightness before removing it.
- 3Cast differential housing: support it with a transmission jack, unbolt it from the subframe and lower it carefully. It is heavy.
- 4Cable with the sensor connector on the housing (if present): disconnect before removing the differential.
- 5Mounting bolts on the housing lugs: undo them from the beam or subframe; tighten to spec on installation.
- 6Subframe (beam) holding the differential: a landmark for finding the mounting bolts.
Parts
7| № | Part |
|---|---|
| 01 | Differential bearing kit (differential and pinion bearings) |
| 02 | Pinion seal |
| 03 | Axle shaft seals2 pcs |
| 04 | Crush sleeve or shim setdepending on differential design |
| 05 | Lock plates or new ring gear bolts |
| 06 | Rear axle gear oil, API GL-5 |
| 07 | Ring and pinion gear setif teeth are worn; replaced only as a matched set |
Tools
11- Lift or inspection pit
- transmission jack
- socket and wrench set
- torque wrench
- bearing puller and press
- dial indicator with stand
- torque gauge for the flange (to measure rotating torque)
- feeler gauges
- gear marking compound
- new gasket or sealant
- oil drain pan
There's a full repair manual for this car
Every system, wiring diagrams and torque specs — not just this job. Haynes AutoFix (online) and 4 more.
See manuals →
Step by step
24 steps- Put the vehicle on a lift or over a pit with the wheels on the ground. Place wheel chocks. Remove the skid plate if it blocks access.
- Use paint to mark the differential flange and the driveshaft flange. This preserves balance during reassembly.
- Drain the oil from the rear differential through the drain plug. Inspect the oil: metal shavings or fine "dust" confirm wear of the bearings or gears.
- Disconnect the driveshaft from the differential flange and secure it out of the way. Disconnect any connectors and sensors on the differential housing, as well as the breather.
- Support the differential with a transmission jack. Pull the axle shafts out of the differential according to your suspension design: remove the wheels and unbolt the joints so the axle shafts can be pulled out of the differential.
- Remove the differential mounting bolts on the axle beam or subframe and carefully lower the differential. The differential is heavy, so do not let it drop.
- Clean the outside of the differential and place it on a workbench. Before disassembly, measure and record: the pinion rotating torque (resistance to turning with the seal removed), the ring-and-pinion backlash with a dial indicator, and the axial play. These numbers will show which adjustments you need to repeat.
- Mark the differential bearing caps so they can go back in their original positions. Remove the caps and lift out the differential case with the bearings.
- Remove the differential case bearings with a puller. Do not strike the race, to avoid damaging the housing. Inspect the journals, spider gears and side gears for wear and scoring.
- Remove the ring gear bolts. They are usually tightened to a high torque and, as a rule, must not be reused. Confirm the new bolts and tightening torque in the manufacturer's specifications. Remove the ring gear from the case.
- Remove the pinion assembly: remove the flange nut (noting its position and the force it was tightened with), remove the flange, take out the pinion with the rear bearing, and carefully remove the seal and the outer bearing.
- Drive the pinion bearing outer races out of the housing with drifts. Thoroughly clean the housing and inspect the seating surfaces: signs of a spinning race mean the housing may be damaged.
- Press in the new outer races and the new inner races of the bearings, observing the direction and seating them fully. Do not use old races with new bearings: bearings are replaced as sets (the inner and outer race of the same kit).
- Set the pinion position. If the design has a shim under the rear bearing, select its thickness based on the pinion depth measurement and the contact pattern. Install the pinion only after checking the depth.
- Assemble the pinion with a new crush sleeve (or shims). Tighten the flange nut gradually, checking the rotating torque with a torque gauge each time. You need to reach the rotating torque specified in the manual. If the nut is overtightened on a crush sleeve, the sleeve must be replaced, because it does not spring back.
- Install a new pinion seal with a driver and lightly lubricate its lip. Install the flange and tighten the nut to the specified torque, guided by the marks and the rotating torque.
- Install the differential case with the new bearings and the ring gear into the housing. Tighten the bearing cap bolts with a torque wrench to the specified torque. To estimate the range: bolts of this size usually require several tens of N·m, but confirm the exact value in the manual.
- Set the differential bearing preload (with adjusting nuts or shims, depending on the design) and the backlash. Mount the dial indicator on a ring gear tooth, lock the pinion and measure the play. It must be within the limits given in the manual (for differentials of this type it is usually a fraction of a millimeter, roughly 0.10-0.30 mm). Measure at 3-4 points around the circumference: the variation must not exceed the allowed limit.
- Check the contact pattern: apply a thin layer of marking compound to several teeth of the ring gear, rotate the gears, and evaluate the imprint. It should be toward the center of the tooth, without shifting to the edge or toward the top or bottom. If the pattern is off, adjust the pinion position or the backlash and repeat the check.
- After the final adjustment, tighten all bolts and locking elements to the specified torques and secure the lock plates.
- Install a new gasket or apply sealant to the cover mating surface, if there is a cover. Install the cover and tighten the bolts in a crisscross pattern.
- Install the differential on the vehicle and tighten the differential mounting bolts to the specified torque. Reconnect the axle shafts, the driveshaft (using the marks made in step 2), the sensors and the breather.
- Fill with new gear oil through the fill hole up to the lower edge. Use the grade and viscosity specified by the manufacturer for the rear axle. Tighten the plugs to the specified torque.
- Take a test drive of 10-15 km. Check for leaks, overheating and howling. Do not load the driveline heavily for the first 500-1000 km. Then check the oil level and the plug tightness.
Common mistakes and warnings
- This is a difficult job, and the safety and service life of the driveline depend on its precision
- Incorrect bearing preload or backlash leads to rapid wear or the differential locking up while driving
- If you don't have experience and measuring equipment, take the vehicle to a repair shop
- The differential is heavy, so work only on solid supports
- The torque values in the text are approximate, so confirm the exact values in the factory service manual