ISUZU TFS SERIES 1997 Service Manual

REAR AXLE 4B-45
(6) Record the pinion depth code on the head of the drive
pinion.
The number indicates a necessary change in the pinion
mounting distance. A plus number indicates the need for a
greater mounting distance (which can be achieved by
decreasing the shim thickness). A minus number indicates
the need for a smaller mounting distance (which can be
achieved by increasing the shim thickness). If examination
reveals pinion depth code "0", the pinion is "nominal".

4B-46 REAR AXLE
(7) Select the shim using table below.
[194 mm]mm(in)Pinion
marking
+10 +8 +6 +4 +2 0 -2 -4 -6 -8 -10Dial indicator
reading (inches)
0.0812.18 (0.0858)0.0822.18 (0.0858) 2.20 (0.0866)0.0832.18 (0.0858) 2.20 (0.0866) 2.24 (0.0882)0.0842.18 (0.0858) 2.20 (0.0866) 2.24 (0.0882) 2.26 (0.0890)0.0852.18 (0.0858) 2.20 (0.0866) 2.24 (0.0882) 2.26 (0.0890) 2.28 (0.0898)0.0862.18 (0.0858) 2.20 (0.0866) 2.24 (0.0882) 2.26 (0.0890) 2.28 (0.0898) 2.32 (0.0914)0.087 2.18 (0.0858) 2.20 (0.0866) 2.24 (0.0882) 2.26 (0.0890) 2.28 (0.0898) 2.32 (0.0914) 2.34 (0.0921)0.088 2.18 (0.0858) 2.20 (0.0866) 2.24 (0.0882) 2.26 (0.0890) 2.28 (0.0898) 2.32 (0.0914) 2.34 (0.0921) 2.36 (0.0929)0.089 2.18 (0.0858) 2.20 (0.0866) 2.24 (0.0882) 2.26 (0.0890) 2.28 (0.0898) 2.32 (0.0914) 2.34 (0.0921) 2.36 (0.0929) 2.38 (0.0937)0.090 2.18 (0.0858) 2.20 (0.0866) 2.24 (0.0882) 2.26 (0.0890) 2.28 (0.0898) 2.32 (0.0914) 2.34 (0.0921) 2.36 (0.0929) 2.38 (0.0937) 2.42 (0.0953)0.091 2.18 (0.0858) 2.20 (0.0866) 2.24 (0.0882) 2.26 (0.0890) 2.28 (0.0898) 2.32 (0.0914) 2.34 (0.0921) 2.36 (0.0929) 2.38 (0.0937) 2.42 (0.0953) 2.44 (0.0961)0.092 2.20 (0.0866) 2.24 (0.0882) 2.26 (0.0890) 2.28 (0.0898) 2.32 (0.0914) 2.34 (0.0921) 2.36 (0.0929) 2.38 (0.0937) 2.42 (0.0953) 2.44 (0.0961) 2.46 (0.0969)0.093 2.24 (0.0882) 2.26 (0.0890) 2.28 (0.0898) 2.32 (0.0914) 2.34 (0.0921) 2.36 (0.0929) 2.38 (0.0937) 2.42 (0.0953) 2.44 (0.0961) 2.46 (0.0969) 2.48 (0.0977)0.094 2.26 (0.0890) 2.28 (0.0898) 2.32 (0.0914) 2.34 (0.0921) 2.36 (0.0929) 2.38 (0.0937) 2.42 (0.0953) 2.44 (0.0961) 2.46 (0.0969) 2.48 (0.0977) 2.52 (0.0992)0.095 2.28 (0.0898) 2.32 (0.0914) 2.34 (0.0921) 2.36 (0.0929) 2.38 (0.0937) 2.42 (0.0953) 2.44 (0.0961) 2.46 (0.0969) 2.48 (0.0977) 2.52 (0.0992) 2.54 (0.1000)0.096 2.32 (0.0914) 2.34 (0.0921) 2.36 (0.0929) 2.38 (0.0937) 2.42 (0.0953) 2.44 (0.0961) 2.46 (0.0969) 2.48 (0.0977) 2.52 (0.0992) 2.54 (0.1000) 2.56 (0.1008)0.097 2.34 (0.0921) 2.36 (0.0929) 2.38 (0.0937) 2.42 (0.0953) 2.44 (0.0961) 2.46 (0.0969) 2.48 (0.0977) 2.52 (0.0992) 2.54 (0.1000) 2.56 (0.1008)0.098 2.36 (0.0929) 2.38 (0.0937) 2.42 (0.0953) 2.44 (0.0961) 2.46 (0.0969) 2.48 (0.0977) 2.52 (0.0992) 2.54 (0.1000) 2.56 (0.1008)0.099 2.38 (0.0937) 2.42 (0.0953) 2.44 (0.0961) 2.46 (0.0969) 2.48 (0.0977) 2.52 (0.0992) 2.54 (0.1000) 2.56 (0.1008)0.000 2.42 (0.0953) 2.44 (0.0961) 2.46 (0.0969) 2.48 (0.0977) 2.52 (0.0992) 2.54 (0.1000) 2.56 (0.1008)0.001 2.44 (0.0961) 2.46 (0.0969) 2.48 (0.0977) 2.52 (0.0992) 2.54 (0.1000) 2.56 (0.1008)0.002 2.46 (0.0969) 2.48 (0.0977) 2.52 (0.0992) 2.54 (0.1000) 2.56 (0.1008)0.003 2.48 (0.0977) 2.52 (0.0992) 2.54 (0.1000) 2.56 (0.1008)0.004 2.52 (0.0992) 2.54 (0.1000) 2.56 (0.1008)0.005 2.54 (0.1000) 2.56 (0.1008)0.006 2.56 (0.1008)
[220 mm]mm(in)
Pinion
marking
+10 +8 +6 +4 +2 0 -2 -4 -6 -8 -10Dial indicator
reading (inches)
0.0731.94 (0.0764) 1.96 (0.0772)0.0741.94 (0.0764) 1.96 (0.0772) 1.98 (0.0779)0.0751.94 (0.0764) 1.96 (0.0772) 1.98 (0.0779) 2.00 (0.0787)0.0761.94 (0.0764) 1.96 (0.0772) 1.98 (0.0779) 2.00 (0.0787) 2.02 (0.0795) 2.04 (0.0803)0.0771.96 (0.0772) 1.98 (0.0779) 2.00 (0.0787) 2.02 (0.0787) 2.04 (0.0803) 2.06 (0.0811)0.078 1.94 (0.0764) 1.96 (0.0772) 1.98 (0.0779) 2.00 (0.0787) 2.02 (0.0787) 2.04 (0.0803) 2.06 (0.0811) 2.08 (0.0819)0.079 1.94 (0.0764) 1.96 (0.0772) 1.98 (0.0779) 2.00 (0.0787) 2.02 (0.0787) 2.04 (0.0803) 2.06 (0.0811) 2.08 (0.0819) 2.10 (0.0827)0.080 1.94 (0.0764) 1.96 (0.0772) 1.98 (0.0779) 2.00 (0.0787) 2.02 (0.0787) 2.04 (0.0803) 2.06 (0.0811) 2.08 (0.0819) 2.10 (0.0827) 2.12 (0.0835) 2.14 (0.0842)0.081 1.96 (0.0772) 1.98 (0.0779) 2.00 (0.0787) 2.02 (0.0787) 2.04 (0.0803) 2.06 (0.0811) 2.08 (0.0819) 2.10 (0.0827) 2.12 (0.0835) 2.14 (0.0842) 2.16 (0.0850)0.082 1.98 (0.0779) 2.00 (0.0787) 2.02 (0.0787) 2.04 (0.0803) 2.06 (0.0811) 2.08 (0.0819) 2.10 (0.0827) 2.12 (0.0835) 2.14 (0.0842) 2.16 (0.0850) 2.18 (0.0858)0.083 2.00 (0.0787) 2.02 (0.0787) 2.04 (0.0803) 2.06 (0.0811) 2.08 (0.0819) 2.10 (0.0827) 2.12 (0.0835) 2.14 (0.0842) 2.16 (0.0850) 2.18 (0.0858) 2.20 (0.0866)0.084 2.04 (0.0803) 2.06 (0.0811) 2.08 (0.0819) 2.10 (0.0827) 2.12 (0.0835) 2.14 (0.0842) 2.16 (0.0850) 2.18 (0.0858) 2.20 (0.0866) 2.22 (0.0874) 2.24 (0.0882)0.085 2.06 (0.0811) 2.08 (0.0819) 2.10 (0.0827) 2.12 (0.0835) 2.14 (0.0842) 2.16 (0.0850) 2.18 (0.0858) 2.20 (0.0866) 2.22 (0.0874) 2.24 (0.0882) 2.26 (0.0890)0.086 2.08 (0.0819) 2.10 (0.0827) 2.12 (0.0835) 2.14 (0.0842) 2.16 (0.0850) 2.18 (0.0858) 2.20 (0.0866) 2.22 (0.0874) 2.24 (0.0882) 2.26 (0.0890) 2.28 (0.0898)0.087 2.12 (0.0835) 2.14 (0.0842) 2.16 (0.0850) 2.18 (0.0858) 2.20 (0.0866) 2.22 (0.0874) 2.24 (0.0882) 2.26 (0.0890) 2.28 (0.0898) 2.30 (0.0906) 2.32 (0.0913)0.088 2.14 (0.0842) 2.16 (0.0850) 2.18 (0.0858) 2.20 (0.0866) 2.22 (0.0874) 2.24 (0.0882) 2.26 (0.0890) 2.28 (0.0898) 2.30 (0.0906) 2.32 (0.0913) 2.34 (0.0921)0.089 2.16 (0.0850) 2.18 (0.0858) 2.20 (0.0866) 2.22 (0.0874) 2.24 (0.0882) 2.26 (0.0890) 2.28 (0.0898) 2.30 (0.0906) 2.32 (0.0913) 2.34 (0.0921) 2.36 (0.0929)0.090 2.18 (0.0858) 2.20 (0.0866) 2.22 (0.0874) 2.24 (0.0882) 2.26 (0.0890) 2.28 (0.0898) 2.30 (0.0906) 2.32 (0.0913) 2.34 (0.0921) 2.36 (0.0929)0.091 2.22 (0.0874) 2.24 (0.0882) 2.26 (0.0890) 2.28 (0.0898) 2.30 (0.0906) 2.32 (0.0913) 2.34 (0.0921) 2.36 (0.0929)0.092 2.24 (0.0882) 2.26 (0.0890) 2.28 (0.0898) 2.30 (0.0906) 2.32 (0.0913) 2.34 (0.0921) 2.36 (0.0929)0.093 2.26 (0.0890) 2.28 (0.0898) 2.30 (0.0906) 2.32 (0.0913) 2.34 (0.0921) 2.36 (0.0929)0.094 2.28 (0.0898) 2.30 (0.0906) 2.32 (0.0913) 2.34 (0.0921) 2.36 (0.0929)0.095 2.32 (0.0913) 2.34 (0.0921) 2.36 (0.0929)0.096 2.34 (0.0921) 2.36 (0.0929)0.097 2.36 (0.0929)
Note :
When ordering shims, find the part number in the Parts Catalog by using the thickness of the shims listed
in the above table.

REAR AXLE 4B-47
4. Inner Bearing
Place the shim on the drive pinion with the chamfered side
turned toward the pinion head, then attach the inner bearing to
the pinion using an installer and a press.
Installer : 9-8522-1165-0
(J-6133-01)
NOTE :
Do not press on the roller cage.
Press only on the inner race.
5. Collapsible Spacer
Discard the used collapsible spacer and install a new one.
8. Oil Seal
Use the oil seal installer to install a new oil seal that has been
soaked in rear axle lubricant.
Installer : 9-8522-1275-0 (194 mm)
(J-24250)
: 5-8840-2165-0 (220 mm)
(J-37263)
10.Flange Nut and Washer
(1) Apply lubricant to pinion threads.
(2) Tighten the nut to the specified torque using the pinion
flange holder.
Pinion flange holder : 5-8840-0133-0 (194 mm)
(J-8614-01)
5-8840-2157-0 (220 mm)
(J-37221)
Flange Nut Torque N
m (kgfm/lbft)
194 mm 176.6 - 274.7 (18 - 28/130 - 202)
220 mm 245.3 - 294.3 (25 - 30/181 - 217)
Discard used flange nuts and install new ones.

4B-48 REAR AXLE
(3) Pinion bearing preload.
(a) Measure the bearing preload by using a torque wrench.
Note the scale reading required to rotate the flange.
(b) Continue tightening until the specified starting torque is
obtained.
Pinion Bearing Preload Starting Torque N
m (kgfm/lbft)
194 mm 64 - 113 (6.5 - 11.5/47 - 72)
220 mm 69 - 127 (7 - 13/51 - 94)
11.Backlash and Pre-load Adjusting Shim
(1) Attach the side bearing to the differential assembly without
shims. Support the opposite side using a pilot to prevent
bearing damage.
1Installer : 9-8522-1164-0 (194 mm)
(J-24244)
: 5-8840-2162-0 (220 mm)
(J-37257)
2Drive handle : 5-8840-0007-0
(J-8092)
3Pilot : 9-8521-1743-0
(J-8107-2)
(2) Position the differential cage assembly with the bearing
outer races to the side bearing bores of the carrier.
(3) Using two sets of feeler gauges, insert a feeler stock of
sufficient thickness between each bearing outer race and
the carrier to remove all end play. Make certain the feeler
stock is pushed to the bottom of the bearing bores.
Mount the dial indicator on the carrier so that the indicator
stem is at right angles to a tooth on the ring gear.
Dial indicator : 5-8840-0126-0
(J-8001)

REAR AXLE 4B-49
(4) Adjust the feeler gauge thickness from side to side until the
ring gear backlash is in the specified range.
Backlash mm(in)
194 mm 0.13 - 0.18 (0.005 - 0.007)
220 mm 0.15 - 0.20 (0.006 - 0.008)
With zero end play and correct backlash established, remove
feeler gauge packs, determine the thickness of shims required
and add 0.05 mm (0.002 in.) to each shim pack to provide side
bearing preload. Always use new shims.
(5) Remove side bearing
Remover : 5-8840-0013-0
(J-22888)
Adapter : 9-8521-1743-0 (194 mm)
(J-8107-2)
: 5-8840-2196-0 (220 mm)
(J-8107-4)
12.Side Bearing
Install side bearings together with selected shims.
1Installer : 9-8522-1164-0 (194 mm)
(J-24244)
: 5-8840-2162-0 (220 mm)
(J-37257)
2Drive handle : 5-8840-0007-0 (J-8092)
3Pilot : 9-8521-1743-0 (J-8107-2)
15.Bearing Cap
Align the setting marks applied at the time of disassembly.

4B-50 REAR AXLE
16.Bolt
Cap Bolt Torque N
m (kgfm/lbft)
194 mm 98.1
9.8 (10 1/72 7.2)
220 mm 107.9 9.8 (11 1/79.5 7.2)
Measure the amount of run-out of the ring gear at its rear face.
Run-Out mm(in)
Standard Limit
194 mm
220 mm0.02 (0.001) 0.05 (0.002)
Gear Tooth Contact Pattern Check and
Adjustment
Apply a thin coat of prussian blue or equivalent to the faces of
7 - 8 teeth of the ring gear. Check the impression of contact
obtained on the ring gear teeth and make necessary
adjustment as described below if the contact is abnormal.

REAR AXLE 4B-51
17.Differential Assembly
(1) Clean the faces of the rear axle case and differential carrier
and apply the recommended liquid gasket or its equivalent.
(2) Mount the differential case and the carrier assembly to the
rear axle case and tighten the nuts and bolts.
Torque N
m (kgfm/lbft)
Nut 37.3
3.9 (3.8 0.4/27 2.9)
bolt 24.5 5 (2.5 0.5/18 3.6)
Nut 44 14.7 (4.5 1.5/32.5 10.8)
Bolt 68.5 5 (6.5 0.5/47 3.6)220 mm 194 mm
(3) Install the axle shaft assemblies as instructed earlier in this
section under "Axle Shaft Reassembly".
(4) Fill the axle case with hypoid gear lubricant to just below the
filler hole.
Lubricant Capacity liter (US/UK gal.)
194 mm 1.5 (0.4/0.33)
220 mm 1.8 (0.48/0.4)
Check owners manual for correct type and viscosity of gear
lubricant required.

4B-52 REAR AXLE
TROUBLESHOOTING
Refer to this Section to quickly diagnose and repair rear axle problems.
Each troubleshooting chart has three headings arranged from left to right.
(1) Checkpoint (2) Trouble Cause (3) Countermeasure
This Section is divided into five sub-sections:
1. Abnormal Rear Axle Noise
1) Noise when the engine is driving the vehicle
2) Noise when the vehicle is coasting
3) Intermittent noise
4) Noise when the vehicle is turning
5) Constant noise
2. Vibration
3. Oil Leakage
1) Differential carrier leakage
2) Axle case leakage
3) Axle case to inside hub leakage
4) Axle case to inside brake drum leakage
4. Power Not Being Transmitted to the Wheels (Propeller Shaft Operation is Normal)

REAR AXLE 4B-53
1. ABNORMAL REAR AXLE NOISE
1) Noise when the Engine is Driving the Vehicle
Checkpoint Trouble Cause Countermeasure
Replenish the gear oilInsufficient gear oil NG
Differential side bearingAdjust the differential side
bearing preload
Replace the drive pinion
bearings
Adjust the drive pinion bearing
preload
Replace the gear oil
Loose differential side
bearings
W orn drive pinion bearings
Loose drive pinion bearings
W rong or poor grade gear oil
Drive pinion to ring gear
backlash
Drive pinion end play
Adjust the backlashToo much or too little backlash
Continued on the next pageOK OK
NG NG NG NG NG
OK
OK
Rear axle gear oil
Replace the differential side
bearingsW orn differential side bearings NG

4B-54 REAR AXLE
Checkpoint Trouble Cause Countermeasure
Replace the drive pinion and
the ring gear as a setExcessive ring gear run-out
Replace the drive pinion and
the ring gear as a setDrive pinion and/or ring gear
damage
NG NGDrive pinion and ring gear Continued from the previous page
Replace the drive pinion and
the ring gear as a setW orn drive pinion and ring
gear NG
2) Noise when the Vehicle is Coasting
Checkpoint Trouble Cause Countermeasure
Replace the ring gear and the
pinion as a setRing gear damaged
Adjust the backlashInsufficient backlash
OK
Ring gearNG NG
Drive pinion and ring gear
backlash