1991 ACURA NSX Service Repair Manual

12. Remov e th e parkin g brak e cabl e holder s fro m th e rea r bea m rod .
13 . Remov e th e rea r bea m rod .
14 . Remov e th e fron t exhaus t pip e A .
Corrosio n resistan t bolt/nu t
SELF-LOCKIN G NU T
Replace .
EXHAUS TPIPE A
GASKE T
Replace .
REAR BEA M RO D
GASKE TReplace .PARKING BRAK E
CABL E HOLDER S
SELF-LOCKIN G NU T
Replace .
1 5 . Remov e th e parkin g brak e cabl e holde r an d th e whee l senso r wir e clamp .
16 . Remov e th e bolt , an d separat e th e to e contro l ar m fro m th e sid e bea m (se e sectio n 18 ).
17 . Remov e th e dampe r for k bol t (se e sectio n 18 ).
18 . Remov e th e bolts , an d separat e th e lowe r contro l ar m fro m th e sid e bea m (se e sectio n 18 ).
19 . Pr y th e driveshaf t ou t o f th e differential . Pul l an d remov e it .
Corrosio n resistan t bolt/nu t
PARKIN G BRAK E
CABL E HOLDE RSELF-LOCKIN
G NU T
Replace .
FLANG E BOL T DAMPE
R FOR K BOL T
WHEE L SENSO R
WIR E CLAM P
SID E BEA M
SELF-LOCKIN G NU T
Replace .ADJUSTIN GCAM
DRIVESHAF T ADJUSTIN G BOL T LOWE
R CONTRO L
ARM
SELF-LOCKIN G NU T
Replace .
TO
E CONTRO L AR M
ProCarManuals.com

Transmission Assembly

Removal

20. Remove the intermediate shaft heat cover and the intermediate shaft mounting bolts.
21. Pry the intermediate shaft out of the differential. Pull and remove it. NOTE:
• Coat all precision finished surfaces with clean engine oil or grease.
• Tie plastic bags over the driveshaft ends.

Corrosion resistant bolt/nut
INTERMEDIATE SHAFT
SUPPORT BASE
INTERMEDIATE SHAFT INTERMEDIATE SHAFT
HEAT COVER
INTERMEDIATE SHAFT
MOUNTING BOLT
22. Remove the parking brake cable holder and the wheel sensor wire clamp.
23. Remove the bolt, and separate the toe control arm from the side beam (see section 18).
24. Remove the damper fork bolt (see section 18).
25. Remove the bolts, and separate the lower control arm from the side beam. 26. Pry the driveshaft out of the differential. Pull and remove it. NOTE:
• Coat all precision finished surfaces with clean engine oil or grease.
• Tie plastic bags over the driveshaft ends.

Corrosion resistant bolt/nut
DAMPER FORK BOLT SELF-LOCKING NUT

Replace.

TOE CONTROL ARM
WHEEL SENSOR WIRE CLAMP PARKING BRAKE
CABLE HOLDER
FLANGE BOLT
LOWER CONTROL ARM SELF-LOCKING NUTReplace. ADJUSTING

BOLT
ADJUSTING

CAM
SELF-LOCKING NUT

Replace.
SET RING

Replace.ProCarManuals.com

27. Remove the one of the upper control arm mounting bolt.

28. Remove the lower cover, change wire bracket and upper cover.

29. Remove the shift cable and select cable.

30. Remove the slave cylinder from the transmission.

NOTE: Do not operate the clutch pedal once the slave

cylinder has been removed.

31. Remove the release fork from the clutch release hanger,

then hang the release fork on the clutch housing.

Corrosion resistant bolt/nut

UPPER CONTROL ARM DAMPER

SLAVE CYLINDER

UPPER COVER

COTTER PIN

Replace.

SHIFT CABLE

CHANGE WIRE

BRACKET

UPPER CONTROL ARM

MOUNTING BOLT
LOWER COVER

SELECT CABLE

32. Remove the clutch housing cover.

33. Attach a chain hoist to the transmission hangers.

34. Place a jack under the transmission, and raise the transmission just enough to take weight off mounts.

35. Remove the front engine mounting bolts on the transmission side, and retighten the bolt on the engine side.

CAUTION: Loosen the front engine mounting bolt on the engine side, but do not remove it. After removing the two

bolts on the transmission side, be sure to retighten the bolt on the engine side.

36. Remove the rear transmission mounting bolts and engine stiffener.

37. Remove the transmission housing mounting bolts.

38. Pull the transmission away from the engine until it clears the mainshaft, then lower it on the transmission jack.

Corrosion resistant bolt/nut

REAR TRANSMISSION

MOUNT

REAR TRANSMISSION

MOUNTING BOLT

TRANSMISSION JACK
TRANSMISSION HOUSING

MOUNTING BOLTS

FRONT ENGINE MOUNTING

BOLT (Engine side)

FRONT ENGINE MOUNTING

BOLT (Transmission side)

TRANSMISSION HOUSING

MOUNTING BOLT
CLUTCH HOUSING

COVER

ENGINE STIFFENER
RELEASE FORKProCarManuals.com

Illustrated Inde x
Clean al l part s thoroughl y i n solven t an d dr y wit h compresse d air .
Lubricat e al l part s wit h oi l befor e reassembly .
NOTE:
• Thi s transmissio n use s n o gasket s betwee n th e majo r housings ; us e liqui d gaske t (P/ N 08718—0001) .
I f 2 0 minute s hav e passe d afte r applyin g liqui d gasket , reappl y i t an d assembl e th e housing s an d allo w it t o cur e
a t leas t 3 0 minute s afte r assembl y befor e fillin g th e transmissio n wit h oil .
• Alway s clea n th e magne t wheneve r th e transmissio n housin g i s disassembled .
CLUTCH RELEAS E HANGE R
RELEAS E HANGE R SPRIN G
RELEAS E BEARIN G GUID E
4 0 x 6 8 x 12. 5 m m OI L SEA L
Replace .14 x 2 0 m m DOWE L PI NCLUTC H HOUSIN GVEHICLE SPEE D SENSO R (VSS )
DIFFERENTIA L SPEE D SENSO R
O-RIN G
Replace .
RELEAS E BEARIN G GUID E COVE R
REVERS E SHIF T FOR K ASSEMBL Y
• Disassembly/Reassembly , pag e
13-16REVERS E IDL E GEA R SHAF T
ASSEMBL Y
• Disassembly/Reassembly , pag e
13-15
OIL GUID E RIN G
9 0 m m WASHE R
BEARIN G OUTE R RAC E
DIFFERENTIA L ASSEMBL Y
• Se e sectio n 1 5OI L GUID E PLAT E
4 4 x 7 2 x 23 m m NEEDL E BEARIN G
•Inspect fo r wea r an d operation .BEARING RETAININ G PLAT E
COUNTERSHAF T ASSEMBL Y
• Index , pag e 13-2 9MAINSHAF T ASSEMBL Y
• Index , pag e 13-2 3
7 5 m m SPRIN G WASHE R
3 2 x 4 6 x 7 mm OI L SEA L
Replace . TRANSMISSIO
N MAGNE T
SHIF T FOR K ASSEMBL Y
• Disassembly/Reassembly , pag e
13-22OIL PUM P ASSEMBL Y
• Disassembly/Reassembly , pag e
13-37CHANG E HOLDE R ASSEMBL Y
• Disassembly/Reassembly , pag e
13-19UPPE R COVE R
SELEC T LEVE R ASSEMBL Y
• Removal , pag e 13-1 7
• Installation , pag e 13-4 3REVERS E SHIF T AR M
1 4 x 2 0 m m DOWE L PI N
1 0 x 2 0 m m DOWE L PI N
ProCarManuals.com

BEARING OUTE R RAC E75 m m THRUS T SHI MSelection .CLAMPBACK-U P LIGH T SWITC H
2 5 N- m (2. 5 kg-m , 1 8 Ib-ft )
CLAM P
TRANSMISSIO N HANGE R B
TRANSMISSIO N HANGE R A
STA Y
WASHER
Replace .OIL FILLE R PLU G
4 5 N- m (4. 5 kg-m . 3 3 Ib-ft )
4 2 x 63 x 12. 5 m m OI L SEA L
Replace .
WASHE R
Replace .DRAIN PLU G
4 0 N- m (4. 0 kg-m , 2 9 Ib-ft ) 3
6 m m SEALIN G BOL T
3 5 N- m (3. 5 kg-m , 2 5 Ib-ft )
STRAINE R COVE R
O-RIN G
Replace .STRAINE R SE T SPRIN G
OI L PUM P STRAINE R
1 4 m m SEALIN G BOL T
3 3 N- m (3. 3 kg-m , 2 4 Ib-ft )
SPRIN G (L . 2 5 mm )
STEE L BAL L (3/ 8 in )
1 2 m m SEALIN G BOL T
2 2 N- m (2. 2 kg-m , 1 6 Ib-ft ) SPRIN
G (L . 24. 2 mm )
1 6 m m SEALIN G BOL T COM P
4 2 N- m (4. 2 kg-m , 3 0 Ib-ft )
STEE L BAL L (5/1 6 in )
SHIF T LEVE R ASSEMBL Y
• Removal , pag e 13-1 7
• Installation , pag e 13-4 3
NEUTRA L POSITIO N SWITC H
2 5 N- m (2. 5 kg-m , 1 8 Ib-ft )
TRANSMISSIO N HOUSIN GOIL GUID E PLAT E82 m m THRUS T SHI M• Selection , pag e 13-4 1
ProCarManuals.com

Transmission Housing

Removal

NOTE: Place the clutch housing on two pieces of wood

thick enough to keep the mainshaft from hitting the

workbench.

1. Remove the back-up light switch, neutral position

switch, differential speed sensor and vehicle speed

sensor (VSS).

VSS

(O-RING Replace.)
NEUTRAL

POSITION

SWITCH

DIFFERENTIAL

SPEED SENSOR

BACK-UP LIGHT SWITCH

2. Remove the sealing bolts, springs and steel balls.

3. Remove the transmission housing attaching bolts

in a crisscross pattern in several steps.

4. Remove the 36 mm sealing bolt.

SPRING

(L. 25 mm)

ATTACHING

BOLT
.14 mm SEALING BOLT

36 mm SEALING BOLT

STEEL BALL (3/8 in)

12 mm SEALING

BOLT

16 mm SEALING

BOLT COMP
5. Expand the snap ring on the countershaft ball bear-

ing, and remove it from the groove using a pair of

snap ring plier.

SNAP RING PLIER

SNAP RING

6. Separate the clutch housing from the transmission

housing.

7. Remove the thrust shim and oil guide plate from the

transmission housing.

THRUST SHIM

OIL GUIDE

PLATE

TRANSMISSION HOUSING
SPRING

(L.
24.2
mm)

STEEL

BALLS (5/16 in)ProCarManuals.com

Reverse Shift Arm, Reverse Shift Fork

Clearance Inspection

1. Measure the clearance between the reverse shift

arm and the 5th/reverse shift piece.

Standard:
0.05-0.30
mm

(0.002-0.012 in)

Service Limit: 0.5 mm (0.020 in)

REVERSE SHIFT ARM

5TH/REVERSE

SHIFT PIECE

2. If the
clearance exceeds
the
service
limit,
measure

the width of the groove in the reverse shift arm.

Standard:
7.05-7.20
mm
(0.278-0.283
in)

REVERSE SHIFT ARM

If the width of the groove exceeds the standard,

replace the reverse shift arm with a new one.

If the width of the groove is within the standard,

replace the 5th/reverse shift piece with a new one.
3. Measure the clearance between the reverse shift

arm and reverse shift fork.

Standard:
0.05-0.35
mm

(0.002-0.014 in)

Service Limit: 0.5 mm (0.020 in)

REVERSE SHIFT ARM

REVERSE SHIFT FORK

4. If the
clearance exceeds
the
service
limit,
measure

the width of the reverse shift arm.

Standard:
12.8-13.0
mm
(0.504-0.512
in)

REVERSE SHIFT ARM

If the width is less than the standard, replace the

reverse shift arm with a new one.

If the width is within the standard, replace the

reverse shift fork with a new one.ProCarManuals.com

Reverse Shift Arm,

Reverse Shift Fork

Clearance Inspection

5. Measure the clearance between the reverse shift

fork and reverse synchro sleeve.

Standard: 0.45—0.65 mm

(0.018-0.026
in)

Service Limit: 1.0 mm (0.039 in)

REVERSE SYNCHRO SLEEVE
REVERSE SHIFT FORK

6. If the clearance exceeds the service limit, measure

the thickness of the shift fork fingers.

Standard:
6.4-6.5
mm
(0.252-0.256
in)

SHIFT FORK

If the thickness is less than the standard, replace

the reverse shift fork with a new one.

If the thickness is within the standard, replace the

reverse synchro sleeve with a new one.

NOTE: The synchro sleeve and synchro hub

should be replaced as a set.ProCarManuals.com