INFINITI QX4 2001 Factory Service Manual

SAT847A
ASSEMBLYNBAT01311. Install D-ring and oil seal on piston.
IApply ATF to both parts.
SAT848A
2. Install piston assembly by turning it slowly and evenly.
IApply ATF to inner surface of drum.
3. Install spring retainer.
SAT524G
4. Install snap ring while compressing clutch springs.
SAT850A
IDo not align snap ring gap with spring retainer stopper.
SAT842A
5. Install drive plates, driven plates, retaining plate and dish plate.
6. Install snap ring.
REPAIR FOR COMPONENT PARTS
Reverse Clutch (Cont'd)
AT-316

SAT852A
7. Measure clearance between retaining plate and snap ring. If
not within allowable limit, select proper retaining plate.
Specified clearance:
Standard
0.5 - 0.8 mm (0.020 - 0.031 in)
Allowable limit
1.2 mm (0.047 in)
Retaining plate:
Refer to SDS, AT-358.
SAT841A
8. Check operation of reverse clutch.
Refer to ªDISASSEMBLYº of Reverse Clutch, AT-314.
High Clutch
COMPONENTSNBAT0132
SAT158K
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
REPAIR FOR COMPONENT PARTS
Reverse Clutch (Cont'd)
AT-317

SAT853A
DISASSEMBLY AND ASSEMBLYNBAT0133Service procedures for high clutch are essentially the same as
those for reverse clutch, with the following exception:
SAT854A
ICheck of high clutch operation
SAT525G
IRemoval and installation of return spring
SAT829A
IInspection of high clutch return springs
Inspection standard:
Refer to SDS, AT-357.
SAT845A
IInspection of high clutch drive plate
Thickness of drive plate:
Standard
1.52 - 1.67 mm (0.0598 - 0.0657 in)
Wear limit
1.40 mm (0.0551 in)
REPAIR FOR COMPONENT PARTS
High Clutch (Cont'd)
AT-318

SAT858A
IMeasurement of clearance between retaining plate and snap
ring
Specified clearance:
Standard
1.8 - 2.2 mm (0.071 - 0.087 in)
Allowable limit
3.2 mm (0.126 in)
Retaining plate:
Refer to SDS, AT-358.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
REPAIR FOR COMPONENT PARTS
High Clutch (Cont'd)
AT-319

Forward and Overrun Clutches
COMPONENTSNBAT0134
SAT159K
REPAIR FOR COMPONENT PARTS
Forward and Overrun Clutches
AT-320

SAT860A
DISASSEMBLY AND ASSEMBLYNBAT0135Forward and overrun clutches are serviced essentially the same
way as reverse clutch is serviced. However, note the following
exceptions.
ICheck of forward clutch operation
SAT861A
ICheck of overrun clutch operation
SAT865A
IRemoval of forward clutch drum
Remove forward clutch drum from transmission case by hold-
ing snap ring.
SAT862A
IRemoval of forward clutch and overrun clutch pistons
a) While holding overrun clutch piston, gradually apply com-
pressed air to oil hole.
SAT863A
b) Remove overrun clutch from forward clutch.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
REPAIR FOR COMPONENT PARTS
Forward and Overrun Clutches (Cont'd)
AT-321

SAT526G
IRemoval and installation of return springs
SAT829A
IInspection of forward clutch and overrun clutch return springs
Inspection standard:
Refer to SDS, AT-357.
SAT845A
IInspection of forward clutch drive plates
Thickness of drive plate:
Standard
1.52 - 1.67 mm (0.0598 - 0.0657 in)
Wear limit
1.40 mm (0.0551 in)
SAT845A
IInspection of overrun clutch drive plates
Thickness of drive plate:
Standard
1.90 - 2.05 mm (0.0748 - 0.0807 in)
Wear limit
1.80 mm (0.0709 in)
SAT866A
IInstallation of forward clutch piston and overrun clutch piston
a) Install forward clutch piston by turning it slowly and evenly.
IApply ATF to inner surface of clutch drum.
REPAIR FOR COMPONENT PARTS
Forward and Overrun Clutches (Cont'd)
AT-322

SAT867A
IAlign notch in forward clutch piston with groove in for-
ward clutch drum.
SAT868A
b) Install overrun clutch by turning it slowly and evenly.
IApply ATF to inner surface of forward clutch piston.
SAT869A
IMeasurement of clearance between retaining plate and snap
ring of overrun clutch
Specified clearance:
Standard
1.0 - 1.4 mm (0.039 - 0.055 in)
Allowable limit
2.0 mm (0.079 in)
Retaining plate:
Refer to SDS, AT-359.
SAT870A
IMeasurement of clearance between retaining plate and snap
ring of forward clutch
Specified clearance:
Standard
0.35 - 0.75 mm (0.0138 - 0.0295 in)
Allowable limit
Model 4EX16 (2WD)
2.15 mm (0.0846 in)
Model 4EX17, 4EX23 (4WD)
2.35 mm (0.0925 in)
Retaining plate:
Refer to SDS, AT-359.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
REPAIR FOR COMPONENT PARTS
Forward and Overrun Clutches (Cont'd)
AT-323

Low & Reverse Brake
COMPONENTSNBAT0136
SAT160K
SAT872A
DISASSEMBLYNBAT01371. Check operation of low and reverse brake.
a. Install seal ring onto oil pump cover and install reverse clutch.
Apply compressed air to oil hole.
b. Check to see that retaining plate moves to snap ring.
c. If retaining plate does not contact snap ring,
ID-ring might be damaged.
IOil seal might be damaged.
IFluid might be leaking past piston check ball.
SAT873A
2. Remove snap ring, low and reverse brake drive plates, driven
plates and dish plate.
REPAIR FOR COMPONENT PARTS
Low & Reverse Brake
AT-324

SAT382I
3. Remove low one-way clutch inner race, spring retainer and
return spring from transmission case.
4. Remove seal rings from low one-way clutch inner race.
5. Remove needle bearing from low one-way clutch inner race.
SAT876A
6. Remove low and reverse brake piston using compressed air.
7. Remove oil seal and D-ring from piston.
INSPECTIONNBAT0138Low and Reverse Brake Snap Ring and Spring RetainerNBAT0138S01ICheck for deformation, or damage.
SAT829A
Low and Reverse Brake Return SpringsNBAT0138S02ICheck for deformation or damage. Also measure free length
and outside diameter.
Inspection standard:
Refer to SDS, AT-357.
SAT845A
Low and Reverse Brake Drive PlatesNBAT0138S03ICheck facing for burns, cracks or damage.
IMeasure thickness of facing.
Thickness of drive plate:
Standard value
Model 4EX16 (2WD)
1.90 - 2.05 mm (0.075 - 0.081 in)
Model 4EX17, 4EX23 (4WD)
1.52 - 1.67 mm (0.0598 - 0.0657 in)
Wear limit
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
REPAIR FOR COMPONENT PARTS
Low & Reverse Brake (Cont'd)
AT-325