1991 ACURA NSX Service Repair Manual

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 switch
and speed sensor.

SPEED SENSOR
NEUTRAL

SWITCH

BACK-UP LIGHT SWITCH
2. Remove the sealing bolts, springs and steel balls.
3. Remove the upper cover, then remove the transmission housing attaching bolts.
4. Remove the 36 mm sealing bolt.

ATTACHING

BOLTS
36 mm SEALING BOLT

SEARING
BOLT

SPRING

STEEL BALL

UPPER COVER
OIL GUIDE

PLATE

THRUST SHIM

6. Separate the clutch housing from the transmission

housing.

7. Remove the thrust shim and oil guide plate from the
transmission housing.
SNAP RING
SNAP RING PLIER

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

ing and remove it from the groove using a pair of

snap ring pliers.ProCarManuals.com

Transmission

Reassembly

SHIFT LEVER
3. Install the oil seal, select arm and select lever in the
clutch housing.

OIL SEAL
Replace.

SELECT LEVER

4. Install the differential assembly in the clutch housing.

DIFFERENTIAL ASSEMBLY

(cont'd)
1. Install the oil seal, shift arm and shift lever in the
transmission housing.

8 x 1.0 mm SPECIAL BOLT
32 N·m (3.2 kg-m, 23 Ib-ft) SPRING WASHERReplace.

SHIFT ARM

OIL SEAL
Replace.

2. Install the shift detent spring and spring set plate.

8 x 1.25 mm SPECIAL BOLT

26 N·m (2.6 kg-m, 19 Ib-ft)
SPRING SET PLATE

SHIFT DETENT SPRING
8 x 1.0 mm SPECIAL BOLT
32 N·m (3.2 kg-m, 23 Ib-ft)
SPRING WASHERReplace.
SELECT ARMProCarManuals.com

Transmission

Reassenbly (cont'd)
5. Install the spring washer, then insert the mainshaft and countershaft into the shift forks and install
them as an assembly.
NOTE: Tape the mainshaft spline, before instal-

lation.

COUNTERSHAFT

ASSEMBLY

MAINSHAFT

ASSEMBLY

SPRING WASHER
SHIFT FORK

ASSEMBLY

6. Install the change holder assembly in the clutch
housing.

NOTE: Plate the interlocker finger in the groove of

the select arm.

6 x 1.0 mm SPECIAL BOLTS
15 N·m (1.5 kg-m, 11 Ib-ft)

CHANGE HOLDER

ASSEMBLY

INTERLOCKER FINGER

SELECT

ARM
REVERSE SHIFT FORK

ASSEMBLY

8. Shift the reverse shift fork to the driven gear side.
Lift the mainshaft assembly and reverse idle gear
shaft assembly, then install the reverse shift fork
assembly.

REVERSE IDLE GEAR

SHAFT ASSEMBLY

7. Lift the mainshaft assembly, then install the
reverse idle gear shaft assembly with the spring pin
matching the groove of the clutch housing.ProCarManuals.com

9. Install the reverse shift arm.

6 x 1.0 mm SPECIAL BOLTS

15 N·m (1.5 kg-m. 11 Ib-ft)

REVERSE SHIFT ARM

10. Apply liquid gasket to the transmission mating sur-

face of the clutch housing.

NOTE: This transmission uses no gasket between

the major housings; use Honda Genuine liquid

gasket (P/N 08718 —0001)'. Assemble the housing

within 20 minutes after applying the liquid gasket

and allow it to cure at least 30 minutes after

assembly before filling it with oil.

(cont'd)
SHIFT PIECE
SHIFT ARM
Neutral

position.
SHIFT LEVER
a. Place the shift lever as a shown.
CLUTCH HOUSING

DOWEL PINS
TRANSMISSION

HOUSING
Groove
3RD/4TH SHIFT FORK SHAFT COLLAR
11. Install the dowel pins on the clutch housing.

12. Place the transmission housing over the clutch

housing, being careful to line up the shafts.

NOTE: Make sure the 3rd/4th shift fork shaft col-

lar mates with the 3rd/4th shift fork shaft.ProCarManuals.com

Transmission

Reassembly (cont'd)

b. Lower the transmission housing, then place the
shift arm in the groove of the shift piece by turn-
ing the shift lever.

TRANSMISSION HOUSING
SHIFT LEVER
SHIFT

ARM

SHIFT PIECE

c. Check the operation of the shift lever.

14. Check that the snap ring is securely seated in thegroove of the countershaft bearing.
Dimension A as installed: 1.60–8.15 mm

(0.0630–0.3209 in)
COUNTERSHAFT

BEARING

SNAP RING

13. Lower the transmission housing with the snap ring

expanded and set the snap ring in the groove of thecountershaft bearing.ProCarManuals.com

1 5. Tighten the transmission housing attaching bolts in

the numbered sequence shown below.

Torque: 45 N·m (4.5 kg-m, 33 Ib-ft)

16. Install the 36 mm sealing bolt.

NOTE: Apply Honda Genuine liquid gasket (P/N

08718-0001) to the flange.

17. Install the steel balls, spring and sealing bolts.

NOTE: Apply Honda Genuine liquid gasket (P/N

08718 — 0001) to the threads, but don't plug the

hole with liquid gasket.

18. Install the upper cover.

STEEL BALL

(3/8 in)

10 x
1.25

mm BOLTS

45 N·m

(4.5 kg-m,

33 Ib-ft)
14 x 1.0 mm SEALING BOLT

33 N·m (3.3 kg-m, 24 Ib-ft)

SPRING (L. 25 mm)

36 mm SEALING BOLT

35 N·m (3.5 kg-m, 25 Ib-ft)

STEEL BALL (5/16 in)

SPRING

(L. 30 mm)

SPRING

(L.
24.2
mm)

UPPER COVER
19. Install the back-up light switch and neutral switch.

NOTE: Apply Honda Genuine liquid gasket (P/N

08718 — 0001) to the threads.

20. Install the speed sensor.

6 x 1.0 mm BOLT

12 N·m (1.2 kg-m, 8.7 Ib-ft)

SPEED SENSOR

8 x 1.25 mm BOLT

26 N·m
(2.6
kg-m,

19 Ib-ft)
NEUTRAL SWITCH

25 N·m
(2.5
kg-m,

18 Ib-ft)

SPRING

(L. 30

mm)
16 x 1.0 mm

SEALING

BOLTS

42 N·m

(4.2 kg-m,

30 Ib-ft)

6 x 1.0 mm BOLTS

12 N·m (1.2 kg-m. 9 Ib-ft)
8 x 1.25 mm BOLTS

24 N·m (2.4 kg-m, 17 Ib-ft)

8 x 1.25 mm BOLTS

24 N·m (2.4 kg-m, 17 Ib-ft)
BACK-UP LIGHT SWITCH

25 N·m (2.5 kg-m, 18 Ib-ft)ProCarManuals.com

Transmission Assembly

Installation

NOTE: Check that the two dowel pins are installed in the clutch housing. 1. Place the transmission on the transmission jack, and raise it to the engine level.
2. Set the release fork to the clutch housing, (see page, 13-9)
3. Install the 2 transmission housing mounting bolts and engine stiffener.
4. Install the 3 rear transmission mounting bolts.
5. Loosen the front engine mounting bolt, then install the 2 front engine mounting bolts to the transmission side.
6. Remove the transmission jack. 7. Install the clutch housing cover.

DOWEL PINS

REAR TRANSMISSION

MOUNTING BOLTS
12 x
1.25
mm

105 N·m

(10.5 kg-m, 76 Ib-ft)
TRANSMISSION

JACK

8. Install the release fork in the release hanger, then install the slave cylinder.
9. Install the shift cable and select cable. CAUTION: Take care not to bend the cables.
10. Install the upper cover, change wire bracket and lower cover.
11. Install the upper control arm mounting bolt.

*: Corrosion resistant bolt/nut
8 x
1.25
mm
22 N·m
(2.2 kg-m,

16 Ib-ft)

COTTER PIN
Replace.

6 x 1.0 mm 12 N·m
(1.2 kg-m,

9 Ib-ft)

*8 x
1.25
mm
26 N·m (2.6 kg-m, 19 Ib-ft)
* UPPER CONTROL ARM MOUNTING BOLT

10 x
1.25
mm

60 N·m (6.0 kg-m. 43 Ib-ft)

Corrosion resistant bolt/nut

TRANSMISSION HOUSING

MOUNTING BOLTS
12 x
1.25
mm

65 N·m (6.5 kg-m, 47 Ib-ft)

FRONT ENGINE

MOUNTING BOLT
10 x
1.25
mm

60 N·m (6.5 kg-m, 43 Ib-ft)

8 x
1.25
mm
22 N·m (2.2 kg-m, 16 Ib-ft)

6 x 1.0 mm
12 N·m
(1.2 kg-m,

9 Ib-ft)

10 x
1.25
mm

45 N·m (4.5 kg-m, 33 Ib-ft)

TRANSMISSION HOUSING MOUNTING BOLT
12 x
1.25
mm

65 N·m (6.5 kg-m, 47 Ib-ft)

6 x 1.0 mm
12 N·m (1.2 kg-m, 9 Ib-ft)ProCarManuals.com

12. Install a new set ring on the end of the left driveshaft and intermediate shaft.
13. Install the left driveshaft.
14. Install the lower arm to the side beam.

CAUTION: Align the reference marks on the adjusting bolt, adjusting cam and lower control arm.
15. Install the damper fork bolt.

16. Install the ball joint nut to the toe control arm at the knuckle.

CAUTION: Make sure that the arrow marks on the toe control arm are aligned.

17. Install the ALB sensor wire clamp and parking brake cable holder.

Corrosion resistant bolt/nut

SELF-LOCKING NUT

Replace.
12 x
1.25
mm

95 N·m (9.5 kg-m, 69 Ib-ft)
SELF-LOCKING NUT

Replace.
12 x
1.25
mm

85 N·m (8.5 kg-m, 62 Ib-ft)

6 x 1.0 mm
10 N·m

(1.0 kg-m. 7 Ib-ft)

SELF-LOCKING NUT
14 x 1.5 mm

125 N·m

(12.5 kg-m, 90 Ib-ft)
8 x
1.25
mm

22 N·m (2.2 kg-m, 16 Ib-ft)

12 x
1.25
mm

95 N·m

(9.5 kg-m, 69 Ib-ft)

ADJUSTING

BOLT
ADJUSTING

CAM
SET RING

SELF-LOCKING NUT
Replace.
12 x
1.25
mm

95 N·m (9.5 kg-m, 69 Ib-ft)

18. Install the intermediate shaft and tighten the intermediate shaft mounting bolts to the intermediate shaft support
base.

19. Install the intermediate shaft heat cover.

SET RING
6 x 1.0 mm

10 N·m (1.0 kg-m, 7 Ib-ft)

8 x
1.25
mm

22 N·m

(2.2 kg-m, 16 Ib-ft)
(cont'd)ProCarManuals.com