LEXUS LS430 2003 Factory Repair Manual

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15.REMOVE REAR DIFFERENTIAL CARRIER COVER
a. Remove the 8 bolts from the carrier cover.
Fig. 11: Removing Rear Differential Carrier Cover Bolts

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b. Using a brass bar and a hammer, separate the cover from carrier.
c. If necessar
y, remove the breather plug from the differential carrier cover.

Fig. 12: Separating Rear Differential Carrier Cover From Carrier
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d. Remove the bolt and oil deflector from the differential carrier cover.

Fig. 13: Removing Bolt And Oil Deflector From Differential Carrier Cover
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16.FIX DIFFERENTIAL CARRIER ASSY REAR
a. Set the differential carrier to the overhaul stand, etc., as shown in the illustration.

Fig. 14: Fixing Differential Carrier Assy Rear
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17.INSPECT RUNOUT OF DIFFERENTIAL RING GEAR
a. Using a dial indicator, measure the ring gear runout.
Maximum runout: 0.05 mm (0.0020 in.)
If the runout is
greater than the maximum, replace the drive pinion, ring gear and differential case.

Fig. 15: Inspecting Runout Of Differential Ring Gear
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18.INSPECT DIFFERENTIAL RING GEAR BACKLASH
a. Using a dial indicator, measure the backlash of the ring gear at 3 points.
Backlash: 0.08 to 0.13 mm (0.0031 to 0.0051 in.)
If the backlash is not within the specification, ad
just the backlash (see step 8).

Fig. 16: Inspecting Differential Ring Gear Backlash
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19.INSPECT TOOTH CONTACT BETWEEN RING GEAR AND DRIVE PINION
a. Coat 3 or 4 teeth at the 3 different positions on the ring gear with red lead primer.
b. Hold the companion flange firmly and rotate the ring gear in both directions.
c. Inspect the tooth contact pattern.

Fig. 17: Inspecting Tooth Contact Between Ring Gear And Drive Pinion
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If tooth contact pattern is not correct, replace the adjusting washer installed on the front of the drive
pinion rear bearing to adjust it.
HINT:
Refer to the table on the next pa
ge to select of the adjusting washer.

Fig. 18: Locating Adjusting Washer Installed On Front Of Drive Pinion Rear Bearing
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Fig. 19: Tooth Contact Pattern Example Chart
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HINT:
There are 42 thicknesses of the rear differential drive pinion plate washers available in 0.01 mm
(0.004 in.) difference.
REAR DIFFERENTIAL DRIVE PINION PLATE WASHERS THICKNESS
Parts No.Thickness mm (in.)No.Parts No.Thickness mm (in.)No.
90201-700011.87 (0.0736)8790201-700222.08 (0.0819)08
90201-700021.88 (0.0740)8890201-700232.09 (0.0823)09
90201-700031.89 (0.0744)8990201-700242.10 (0.0827)10
90201-700041.90 (0.0748)9090201-700252.11 (0.0831)11
90201-700051.91 (0.0752)9190201-700262.12 (0.0835)12
90201-700061.92 (0.0756)9290201-700272.13 (0.0839)13
90201-700071.93 (0.0760)9390201-700282.14 (0.0843)14
90201-700081.94 (0.0764)9490201-700292.15 (0.0846)15
90201-700091.95 (0.0768)9590201-700302.16 (0.0850)16
90201-700101.96 (0.0772)9690201-700312.17 (0.0854)17
90201-700111.97 (0.0776)9790201-700322.18 (0.0858)18
90201-700121.98 (0.0780)9890201-700332.19 (0.0862)19
90201-700131.99 (0.0783)9990201-700342.20 (0.0866)20
90201-700142.00 (0.0787)0090201-700352.21 (0.0870)21
90201-700152.01 (0.0791)0190201-700362.22 (0.0874)22
90201-700162.02 (0.0795)0290201-700372.23 (0.0878)23
90201-700172.03 (0.0799)0390201-700382.24 (0.0882)24

20.INSPECT DIFFERENTIAL SIDE GEAR BACKLASH
a. Using a vise, hold the differential case between two aluminum plates.
b. Place a dial indicator on the tip of the pinion gear tooth at a right angle. Hold the side gear in the
differential case and check that the backlash is 0 mm (0 in.).
If the backlash is not within the specification, replace the rear differential case sub-assy with a new one.
Fig. 20: Inspecting Differential Side Gear Backlash

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21.INSPECT RUNOUT OF DIFFERENTIAL DRIVE PINION
a. Using a dial indicator, measure the runout of the drive pinion shaft at a position 10 mm (0.39 in.)
away from the end of the shaft.
Maximum runout: 0.08 mm (0.0031 in.)
90201-700182.04 (0.0803)0490201-700392.25 (0.0886)25
90201-700192.05 (0.0807)0590201-700402.26 (0.0890)26
90201-700202.06 (0.0811)0690201-700412.27 (0.0894)27
90201-700212.07 (0.0815)0790201-700422.28 (0.0898)28