Transfer Clutch
A: REMOVAL
1. Remove rear vehicle speed sensor.
2. Separate transmission case and extension case sections.
3. Take out the transfer clutch by lightly tapping the end of the rear drive shaft.
NOTE: Be careful not to damage the oil seal in the extension.
B: INSTALLATION
1. Install the transfer clutch assembly to the case.
NOTE: Be careful not to damage the seal rings.
2. Tighten bolts to secure the case.
Tightening torque: 25 Nm (2.5 kgf-m, 18.1 ft. lbs.)
C: DISASSEMBLY
1. Remove the seal ring.
NOTE: Do not re-use seal ring. Prepare a new one.
2. Using a press and ST, remove the ball bearing.
NOTE: Do not reuse the bearing.
ST 498077600 REMOVER
3. Remove the snap ring, and take out the pressure plate, drive plates, and driven plates.
4. Remove the snap ring with ST1, ST2 and ST3, and take out the return spring and transfer clutch piston seal.
ST1 399893600 PLIERS
ST2 398673600 COMPRESSOR
ST3 398623600 SEAT
5. Apply compressed air to the rear drive shaft to remove the piston.
D: REASSEMBLY
1. Install the transfer clutch piston.
2. Install return spring to transfer piston.
3. Install transfer clutch piston seal.
4. Install ST to rear drive shaft.
ST 499257300 SNAP RING OUTER GUIDE
5. Install snap ring to ST.
ST 499257300 SNAP RING OUTER GUIDE
6. Using ST1 and ST2, install snap ring to rear drive shaft.
NOTE: After installing snap ring, remove ST1 and ST2.
ST1 499257300 SNAP RING OUTER GUIDE
ST2 499247400 INSTALLER
7. Install the driven plates, drive plates, pressure plate and snap ring.
8. Apply compressed air to see if the assembled parts move smoothly.
9. Check clearance between snap ring and pressure plate.
10. Press-fit the ball bearing with ST.
ST 899580100 INSTALLER
11. Coat the seal ring with Vaseline, and install it in the seal ring groove of the shaft.
NOTE: Do not expand the seal ring excessively when installing.
12. Install the transfer clutch assembly to the case.
NOTE: Be careful not to damage the seal rings.
E: INSPECTION
^ Check the drive plate facing for wear and damage.
^ Check the snap ring for wear, return spring for permanent set and breakage, and return spring for deformation.
^ Check the lathe cut ring for damage.
^ Measure the extension end play and adjust it to within specifications.
1. Inspect clearance between snap ring and pressure plate.
NOTE:
^ Before measuring clearance, place the same thickness of shim on both sides to prevent pressure plate from tilting.
^ If the clearance is not within specification, adjust it by selecting a suitable pressure plate on the transfer clutch piston side.
Standard value: 0.7 - 1.1 mm (0.028 - 0.043 inch)
Allowable limit: 1.6 mm (0.063 inch)
F: ADJUSTMENT
1. WITHOUT VTD
1. Measure distance "L" from end of extension case and rear drive shaft with ST.
ST 398643600 GAUGE
L= Measured value - 15 mm
(L= Measured value - 0.59 inch)
A: Measured value
B: ST thickness [15 mm (0.59 inch)]
L: Distance from end of extension case to end of rear drive shaft
2. Measure the distance "e" from the transmission case mating surface to the reduction drive gear end surface with ST1 and ST2.
e = Measured value - 50 mm
(t = Measured value - 1.97 inch)
ST1 398643600 GAUGE
ST2 499577000 GAUGE
A: Measured value
B: ST thickness [50 mm (1.97 inch)]
a: Distance from end of transmission case to end of reduction drive gear
3. Calculation equation:
NOTE: Calculate "H": When clearance is at 0.05 mm (0.0020 inch) and 0.25 mm (0.0098 inch), then select a suitable thrust needle bearing from the table.
H = (L + 0.45 mm) - e - T
[H = (L + 0.0177 inch) - e - T]
T: Thrust needle bearing thickness
L: Distance from end of extension case to end of rear drive shaft
0.45 mm (0.0177 inch): Gasket thickness
e: Distance from end of transmission case to end of reduction drive gear
H: Shim clearance 0.05 - 0.25 mm (0.0020 - 0.0098 inch)
Example:
When, L = 18.60 mm (0.7323 inch), e = 15.05 mm (0.5925 inch)
Calculation when clearance is 0.05 mm (0.0020 inch)
H = (18.60 + 0.45 - 15.05 - 0.05 = 3.95
[H = (0.7323 + 0.0177 - 0.5925 - 0.0020 = 0.1555]
Calculation when clearance is 0.25 mm (0.0098 inch)
H = (18.60 + 0.45 - 15.05 - 0.25 = 3.75
[H = (0.7323 + 0.0177 - 0.5925 - 0.0098 = 0.1476]
After calculation, the value of "H" becomes between 3.75 and 3.95, therefore select bearing thickness of 3.8.
2. WITH VTD
1. Install the rear drive shaft into the reduction drive gear and center differential assembly.
2. Measure the distance "L" from mating surface of extension case to multi-plate clutch (LSD) piston with ST.
ST 398643600 GAUGE
L= Measured value - 15 mm (L = Measured value - 0.59 inch)
A: Measured value
B: ST thickness [15 mm (0.59 inch)]
L: Distance from end of extension case to end of rear drive shaft
3. Measure the distance "e" from the transmission case mating surface to the reduction drive gear end surface with ST.
e = Measured value - 15 mm
(I = Measured value - 0.59 inch)
ST 398643600 GAUGE
A: Measured value
B: ST thickness [15 mm (0.59 inch)]
e: Distance from end of extension case to end of reduction drive gear
4. Calculation equation:
NOTE:
Calculate "H": When clearance is at 0.05 mm (0.0020 inch) and 0.25 mm (0.0098 inch), then select no more than 4 adjusting shims from the table, which suit the clearance value.
H = (L + 0.45 mm) - e - T
[H = (L + 0.0177 inch) - e - T]
T: Shim clearance
L: Distance from end of extension case to end of rear drive shaft 0.45 mm (0.0177 inch): Gasket thickness
e: Distance from end of transmission case to end of reduction drive gear
T: Shim thickness 0.05 - 0.25 mm (0.0020 - 0.0098 inch)
Example:
When, L = 90.50 mm (3.5630 inch), e = 90.35 mm (3.5571 inch)
Calculation when clearance is 0.05 mm (0.0020 inch)
H = (90.50 + 0.45 - 90.35 - 0.05 = 0.55
[H = (3.5630 + 0.0177 - 3.5571 - 0.0020 = 0.0217]
Calculation when clearance is 0.25 mm (0.0098 inch)
H = (90.50 + 0.45 - 90.35 - 0.25 = 0.35
[H = (3.5630 + 0.0177 - 3.5571 - 0.0098 = 0.0138]
After calculation, the value of "H" falls between 0.35 mm (0.0138 inch) and 0.55 mm (0.0216 inch), therefore select a two-piece shim thickness of 0.2 mm (0.010 inch) or 1 piece at 0.5 mm (0.020 inch).