sensor ACURA NSX 1991 Service Repair Manual

Transmission
Removal
Make sure lifts are placed properly, and

hoist brackets are attached to correct position (see sec-

tion 1).
CAUTION: Use fender covers to avoid damaging painted

surfaces.

1. Check and record the rear camber. (see section 18.)
2. Disconnect the battery negative (-) first, and positive (+) cable from the battery.
3. Drain automatic transmission fluid (ATF). Reinstall the drain plug with a new washer.
NOTE: Removing the ATF level gauge will allow the
ATF to drain more rapidly. 4. Remove the strut bar.
5. Remove the air cleaner housing.
6. Remove the connectors from the control box and remove the control box (see section 11).
CAUTION: Do not remove the vacuum tubes from
the control box.
7. Remove the wire harness holder, disconnect the vehicle speed sensor (VSS) wire connectors,
solenoid valve wire connectors, starter motor
cables and transmission ground cable.
8. Remove the ATF cooler as it is connected by the
hoses.

CAUTION: Do not remove the hoses from the ATF

cooler.

9. Remove the starter motor mounting bolts, then remove the starter motor.
10. Remove the transmission housing bolts and the transmission mounting bolts.
MAINSHAFT SPEED SENSOR
CONNECTOR
LOCK-UP CONTROL
SOLENOID VALVE
CONNECTOR
STARTER MOTOR
TRANSMISSION

HOUSING BOLTS
CONTROL BOX
STARTER MOTOR
STARTER MOTOR
MOUNTING BOLT
ATF COOLER
ATF COOLER FILTER/GASKET Replace.

VSS

CONNECTOR
COUNTERSHAFT SPEED SENSOR
CONNECTOR
LINEAR SOLENOID
CONNECTOR

SHIFT CONTROL

SOLENOID VALVE
CONNECTOR
GROUND CABLE
TRANSMISSION

MOUNTING BOLTS
TRANSMISSION

HANGER
Corrosion resistant bolt/nut

CABLEProCarManuals.com

(cont'd)
11. Remove the parking brake cable holders from the rear beam rod.

12. Remove the rear beam rod.

13. Remove the front exhaust pipe A.

PARKING BRAKE

CABLE HOLDER
PARKING BRAKE

CABLE
Corrosion resistant bolt/nut

Replace.
SELF-LOCKING NUT

REAR BEAM ROD
GASKET

Replace.

SELF-LOCKING NUT

Replace.

FRONT EXHAUST

PIPE A

14. Remove the parking brake cable holder and the wheel sensor wire clamp.

15. Make a reference mark on the flange of the adjusting bolt, adjusting cam and lower control arm.

16. Separate the toe control arm from the side beam.

17. Remove the damper fork bolt.

18. Separate the lower control arm from the side beam.

19. Remove the right driveshaft from the intermediate shaft.

DAMPER FORK BOLT

PARKING BRAKE

CABLE HOLDER

WHEEL SENSOR

WIRE CLAMP

LOWER CONTROL ARM

SELF-LOCKING NUT

Replace.
SIDE BEAM

TOE CONTROL ARM

SELF-LOCKING

NUT

Replace.

ADJUSTING BOLT
ADJUSTING CAM
Corrosion resistant bolt/nutProCarManuals.com

Transmission

Removal (cont'd)

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:

INTERMEDIATE SHAFT

INTERMEDIATE SHAFT

HEAT COVER

INTERMEDIATE SHAFT

MOUNTING BOLT
SET RING

Replace.

INTERMEDIATE SHAFT

22. Remove the parking brake cable holder and the wheel sensor wire clamp.

23. Make a reference mark on the flange of the adjusting bolt, adjusting cam and lower control arm.

24. Separate the toe control arm from the side beam.

25. Remove the damper fork bolt.

26. Separate the lower control arm from the side beam.

27. Pry the driveshaft out of the differential. Pull and remove it.

NOTE:

TOE CONTROL ARM

DAMPER FORK BOLT

PARKING BRAKE

CABLE HOLDER

SIDE BEAM

SET RING

Replace.

SELF-LOCKING NUT

Replace.
ADJUSTING

CAM
ADJUSTING

BOLT
SELF-LOCKING

NUT

Replace.
LOWER CONTROL

ARM
WHEEL SENSOR

WIRE CLAMP
SUPPORT BASE
Coat all precision finished surfaces with clean engine oil or grease.

Tie plastic bags over the driveshaft ends.

Coat all precision finished surfaces with clean engine oil or grease.

Tie plastic bags over the driveshaft ends.ProCarManuals.com

LEFT SIDE COVER
DOWEL PIN
GASKET Replace.
SEALING WASHER
Replace.

O-RING
Replace.

1ST-HOLD CLUTCH FEED PIPE
O-RING
Replace.
FEED PIPE FLANGE
SNAP RING
1ST CLUTCH FEED PIPE
O-RING
Replace.
FEED PIPE FLANGE
SNAP RING
CONICAL SPRING WASHER
Replace.
BALL BEARING
1ST-HOLD CLUTCH ASSEMBLY
O-RING
Replace.
THRUST WASHER
THRUST NEEDLE BEARING
1ST-HOLD CLUTCH HUB
COUNTERSHAFT 1ST GEAR
ONE-WAY CLUTCH NEEDLE BEARINGS
COUNTERSHAFT 1ST GEAR COLLAR
PARKING GEAR
CONICAL SPRING WASHER
Replace.
1ST CLUTCH ASSEMBLY
O-RING
Replace.
THRUST WASHER
THRUST NEEDLE BEARING
NEEDLE BEARINGMAINSHAFT 1ST GEAR
THRUST WASHER MAINSHAFT 1ST GEAR COLLAR
PARKING BRAKE PAWL STOPPER PARKING BRAKE PAWL
PARKING BRAKE PAWL SPRING
PARKING BRAKE PAWL SHAFT
LOCK WASHER
Replace.
PARKING BRAKE STOPPER

ROLLER PIN

PARKING BRAKE LEVER
WASHER
PARKING BRAKE SPRING

ROLLER

COTTER PIN
Replace.
SEALING WASHER
Replace.

CONICAL SPRING WASHER
Replace.

TRANSMISSION HANGER/CONNECTOR STAY
SEALING WASHER
Replace.

BREATHER JOINT
BREATHER CAP
TRANSMISSION HANGER COUNTERSHAFT SPEED SENSOR
O-RING
Replace.
ATF COOLER
ATF COOLER FILTER/GASKET
Replace.

SPEED SENSOR COVER
LINEAR SOLENOID SHIM
O-RING
Replace.
LINEAR SOLENOID
CONNECTOR STAY
MAINSHAFT SPEED SENSOR
O-RING
Replace.
ATF LEVEL GAUGE
ATF LEVEL GAUGE PIPE
O-RING
Replace.
RETAINER PLATE
BALL BEARING
COUNTERSHAFT SPEED SENSOR WASHER
TORQUE SPECIFICATIONProCarManuals.com

ATF STRAIER Clean or replace.

O-RING
Replace.

ACCUMULATOR COVER
LOCK WASHER
Replace.
SERVO DETENT BASE
SERVO VALVE BODY
SERVO SEPARATOR PLATE CHECK BALLS (7/32) 7
SECONDARY VALVE BODY FILTER
Replace.
SECONDARY VALVE BODY
SECONDARY SEPARATOR PLATE
DOWEL PIN
LOCK-UP VALVE BODY
LOCK-UP SEPARATOR PLATE
DOWEL PIN REGULATOR VALVE BODY
O-RING
Replace.
STATOR SHAFT ASSEMBLY
STOPPER PIN
MAIN VALVE BODY FILTER
Replace. CHECK BALLS (7/32) 7
MAIN VALVE BODY
ONE-WAY RELIEF VALVE SPRING
ONE-WAY RELIEF VALVE
OIL PUMP DRIVEN GEAR
OIL PUMP DRIVE GEAR
OIL PUMP DRIVEN GEAR SHAFT
DOWEL PIN MAIN SEPARATOR PLATE
TORQUE CONVERTER CHECK VALVE
TORQUE CONVERTER CHECK VALVE SPRING ATF LUBRICATION PIPE
2ND ACCUMULATOR BODY
LSD RELIEF VALVE SPRINGLSD RELIEF VALVE
CONTROL SHAFT
CONTROL LEVER
OIL SEAL
Replace.
LOCK WASHER
Replace.

CHANGE SHAFT
CHANGE SHAFT CAP
SHIFT CONTROL SOLENOID VALVE ASSEMBLY
SHIFT CONTROL SOLENOID FILTER/GASKET
Replace.
LOCK-UP CONTROL SOLENOID VALVE ASSEMBLY
LOCK-UP CONTROL SOLENOID FILTER/GASKET
Replace.
VEHICLE SPEED SENSOR ASSEMBLY
O-RING Replace.

SECONDARY SHAFT NEEDLE BEARING
Replace.

OIL GUIDE PLATE
Replace.

COUNTERSHAFT NEEDLE BEARING
Replace.

OIL GUIDE PLATE
Replace.

MAINSHAFT BALL BEARING
Replace.

MAINSHAFT OIL SEAL
Replace.

SEALING WASHER
Replace.

4TH OIL GUIDE PLATE/PIPE
3RD OIL GUIDE PLATE
TORQUE SPECIFICATIONProCarManuals.com

Left Side Cover

Removal

CAUTION: Protect the lip of the
driveshaft oil seal by reinstalling three
bolts, after removing the speed sensor
cover.

DRIVESHAFT

OIL SEAL
VEHICLE SPEED

SENSOR (VSS)

COVER BOLT

MAINSHAFT HOLDER

07924–PJ4010A

NOTE: Using a chisel, cut the lock tab. Pry

it up and then remove the locknut from each

shaft.
CAUTION: Keep all of the chiseled
particles out of the transmission.

CHISEL

LOCK TAB

Reinstall 3 bolts around
the driveshaft oil seal.

NOTE:

Clean all parts thoroughly in solvent or carburetor cleaner and dry with compressed air.
Blow out all passages.
Cut the lock tab and raise it, then remove the locknut of each shaft.
Countershaft locknut has left-hand threads.
1. Remove the vehicle speed sensor (VSS) cover, then reinstall three bolts around the driveshaft oil seal.
CAUTION: Do not damage the driveshaft oil seal lip.
2. Slip the special tool onto the mainshaft and engage the parking brake pawl with the parking gear.
3. Remove the transmission left side cover in the following numbered sequence. NOTE: Remove the special tool from the mainshaft after removing the locknuts.ProCarManuals.com

LINEAR SOLENOID

6 x 1.0 mm

10 N .
m(1.0 kg-m, 7 Ib-ft)

MAINSHAFT SPEED SENSOR
SPEED SENSOR

COVER
LINEAR
SOLENOID

SHIM

COUNTERSHAFT
SPEED
LOCK WASHER
6 x 1.0 mm

(1.4 kg-m, 10 Ib-ft)

SPEED
SENSOR
COUNTERSHAFT

Install the countershaft speed sensor with the

countershaft speed sensor washer. The main-
shaft speed sensor has no washer.

See page 14-81 thru 82, when installing the

linear solenoid.

NOTE:

13. Install the countershaft and mainshaft speed sen-
sors, vehicle speed sensor cover and linear sole-

noid.

TORQUE: 12 N .
m (1.2 kg-m, 9 Ib-ft)
CONTROL SHAFT
CHANGE SHAFT
CHANGE SHAFT CAP

6x
1.0mm

12 N
.
m (1.2 kg-m, 9 Ib-ft)

CONTROL

LEVER

14. Install the control lever, new lock washers, change
shaft and change shaft cap on the other end of the

control shaft. Tighten the bolts and then bend the tab

over against the bolt head.

12. Install the left side cover.

TORQUE: 12 N .
m (1.2 kg-m, 9 Ib-ft)

SENSOR
WASHER
14 N
.
mProCarManuals.com

Transmission
Installation (cont'd)

11. Install a new set ring on the end of the left driveshaft and intermediate shaft.

12. Install the left driveshaft.
13. Install the lower control arm to the side beam. CAUTION: Line up the reference marks on the adjusting boh, adjusting cam and lower control arm.

14. Install the damper fork bolt.
15. Install the toe control arm to the side beam. CAUTION: Make sure that the reference marks on the toe control arm are aligned.
16. Install the wheel sensor wire clamp and parking brake cable holder.

SELF-LOCKING NUTReplace.
12 x
1.25
mm

95 N .
m (9.5 kg-m, 69 Ib-ft) DAMPER
FORK BOLT
SELF-LOCKING NUT
Replace.

12 x 1.25mm

85 N .
m (8.5 kg-m, 62 Ib-ft)

6x1.0
mm
10 N .
m (1.0 kg-m, 7 Ib-ft)

FLANGE BOLT
12 x
1.25
mm

95 N .
m (9.5 kg-m, 69 Ib-ft)

TOE CONTROL ARM SET RING

6x1.0
mm

Replace. SELF-LOCKING NUT
ADJUSTING NUT
Replace.
14 x 1.5 mm

125 N .
m (12.5 kg-m. 90 Ib-ft)

ADJUSTING CAM

ADJUSTING BOLT

17. Install the intermediate shaft and tighten the intermediate shaft mounting bolts to the intermediate shaft support base.
18. Install the intermediate shaft heat cover.
6x1.0
mm
10 N·m

(1.0 kg-m, 7 Ib-ft)
INTERMEDIATE SHAFT
HEAT COVER

8x1.25 mm
22 N·m
(2.2 kg-m, 16 Ib-ft)
INTERMEDIATE SHAFT
SET RING

Corrosion resistant bolt/nut

10 N .
m (1.0 kg-m, 7 Ib-ft)

14 x 1.5 mm
125 N .
m

(12.5 kg-m, 90 Ib-ft)ProCarManuals.com

19. Install the right driveshaft on the intermediate shaft.

20. Install the lower control arm to the side beam. CAUTION: Line up the reference marks on the adjusting bolt, adjusting cam and lower control arm.

21. Install the damper fork bolt.
22. Install the toe control arm to the side beam. CAUTION: Make sure that the reference marks on the toe control arm are aligned.
23. Install the wheel sensor wire clamp and parking brake cable holder.
Corrosion resistant bolt/nut
SELF-LOCKING NUT DAMPER FORK
BOLT
SELF-LOCKING NUTReplace.
12 x
1.25
mm

95 N .
m (9.5 kg-m, 69 Ib-ft)

6 x 1.0 mm

FLANGE BOLT

(cont'd)

SELF-LOCKING NUT

Replace.

10 x
1.25
mm

55 N .
m (5.5 kg-m, 40 Ib-ft)
10 x
1.25
mm

60 N .
m (6.0 kg-m, 43 Ib-ft) 95 N
.
m (9.5 kg-m, 69 Ib-ft)

12 x
1.25
mm
22 N
.
m
(2.2 kg-m,

16 Ib-ft)
8 x
1.25
mm

22 N .
m

(2.2 kg-m, 16 Ib-ft)
8 x
1.25
mm
GASKET

Replace.
SELF-LOCKING NUT
Replace.
10 x
1.25
mm

34 N .
m

(3.4 kg-m. 25 Ib-ft)

24. Install the front exhaust pipe A.

25. Install the rear beam rod.
26. Install the parking brake cable.
ADJUSTING CAM

125 N
.
m (12.5 kg-m, 90 Ib-ft)

ADJUSTING NUT

Replace.
14 x 1.5 mm
TOE CONTROL ARM

95 N
.
m

(9.5 kg-m, 69 Ib-ft) Replace.

12 x
1.25
mm

85 N .
m

(8.5 kg-m, 62 Ib-ft)

10 N .
m

(1.0 kg-m, 7 Ib-ft)

12 x
1.25
mm

Corrosion resistant bolt/nut
ADJUSTING

BOLT
SELF-LOCKING NUT
Replace.

14 x 1.5 mm

12.5 N·m (12.5 kg-m, 90 Ib-ft)
LOWER CONTROL ARM

6 x 1.0 mm

10 N .
m (1.0 kg-m, 7 Ib-ft)ProCarManuals.com

Transmission

Installation (cont'd)
27. Install the 3 transmission mounting bolts, and the 2 transmission housing mounting bolts.
28. Install the starter motor and tighten the starter motor mounting bolts.
29. Install the ATF cooler.
30. Connect the transmission ground cable, starter motor cable, solenoid valve wire connectors and vehicle
speed sensor (VSS) wire connectors.
31. Install the control box and connect the control box connectors.
32. Install the air cleaner housing.
33. Install the strut bar.
TORQUE: 39 N .
m (3.9 kg-m, 28 Ib-ft)
Corrosion resistant bolt/nut 34. Refill the transmission with ATF.
35. Connect the battery positive (+) and negative (-) ca- ble to the battery.
36. Inspect the rear camber (see section 18).
37. Start the engine. Set the parking brake, and shift the transmission through all gears three times. Check forproper shift cable adjustment.
38. Check the ignition timing (see section 23).
39. Let the engine reach normal operating temperature (the cooling fan comeson) with the transmission in or position, then turn it off and check the
fluid level.
40. Road test as described on page 14-88.
TRANSMISSION HOUSING MOUNTING BOLT
12 x
1.25
mm

75 N .
m (7.5 kg-m, 54 Ib-ft)
CONTROL BOX

8x1.25 mm
18 N .
m
(1.8 kg-m,
13 Ib-ft)
TRANSMISSION MOUNTING BOLT
10 x 1.25mm

60 N .
m (6.0 kg-m, 43 Ib-ft)
STARTER MOTOR
MOUNTING BOLT
12 x 1.25mm

75 N .
m
(7.5 kg-m,
54 Ib-ft)ProCarManuals.com