1991 ACURA NSX Service Repair Manual

Emission Control System
Evaporative Emission Controls

(cont'd)

Two-Way Valve Test 1. Remove the fuel filler cap.
2. Remove vapor line from the fuel tank and connect to T-fitting from vacuum gauge and vacuum pump
as shown.

VACUUM/PRESSURE GAUGE

0-4 in. Hg

07JAZ–001000A

VACUUM PUMP/

GAUGE

A973X–041–XXXXX

T—FITTING

3. Apply vacuum slowly and continuously while watching the gauge.
Vacuum should stabilize momentarily at 5 to 1 5

mmHg (0.2 to 0.6 in. Hg).
If vacuum stabilizes (valve opens) below 5 mmHg
(0.2 in. Hg) or above 15 mmHg (0.6 in. Hg), in-
stall new valve and retest.
4. Move vacuum pump hose from vacuum to pressure fitting, and move vacuum gauge hose from vacuum
to pressure side as shown.

PRESSURE SIDE

5. Slowly pressurize the vapor line while watching the
gauge.
Pressure should stabilize at 10 to 35 mmHg (0.4 to
1.4 in.
Hg).
If pressure momentarily stabilizes (valve opens)
at 10 to 35 mmHg (0.4 to 1.4 in. Hg), the valve

is OK.

If pressure stabilizes below 10 mmHg (0.4 in. Hg) or above 35 mmHg (1.4 in. Hg), install a
new valve and retest.ProCarManuals.com

Cable Adjustment
NOTE: See page 13-6, 13-47 for removal and

installation.

Select Cable
1. With the transmission in neutral, measure the distance

: 140.5-141.5 mm (5.53-5.57 in)

2. If distance is out of spec, loosen the locknut
and turn the adjuster as necessary.
ADJUSTER

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

3. Tighten the locknut.
NOTE: After adjustment, check operation of the
gearshift lever.
3. Tighten the locknut.

NOTE: After adjustment, check operation of the
gearshift lever.

ADJUSTER

LOCKNUT

10 N.m (1.0 kg-m, 7 Ib-ft) 2. If distance is out of spec, loosen the locknut and
turn the adjuster as necessary.
Shift Cable
1. With the transmission in neutral, measure distance
: 157.5-158.5 mm (6.20-6.24 in)ProCarManuals.com

Transmission Assembly

Removal
Make sure lifts are placed properly, and

hoist brackets are attached to correct position, (see

page 1-6).

CAUTION: Use fender covers to avoid damaging

painted surfaces.

1. Check and record the rear camber.
(see section 18).
2. Disconnect the battery negative (-), and positive (+) cables from the battery.
3. Drain transmission oil. Reinstall the drain plug with a new washer.

Corrosion resistant bolt/nut
TRANSMISSION
HOUSING BOLT

BACK-UP

LIGHT SWITCH

CONNECTOR

HARNESS HOLDER

STARTER MOTOR

CABLES

NEUTRAL SWITCH
CONNECTOR

STARTER
MOTOR
MOUNTING

BOLTS

TRANSMISSION

MOUNT

GROUND

CABLE

TRANSMISSION

HANGER
TRANSMISSION

MOUNTING BOLTS
JUMPER

CONNECTOR

CONTROL BOX

SPEED SENSOR

CONNECTOR
4. Remove the strut bar.

5. Remove the air cleaner case.

6. Remove the connectors from the control box and remove the control box.
CAUTION: Do not remove the vacuum tubes from
the control box.
7. Remove the wire harness holder, jumper connector and transmission ground cable.
8. Disconnect the switch connectors, then remove the back-up light switch and neutral switch.
9. Disconnect the starter motor cables, then remove the starter motor.
10. Remove the transmission housing bolts.ProCarManuals.com

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.

Corrosion resistant bolt/nut
SELF-LOCKING NUT
Replace.

GASKET

Replace.
SELF LOCKING NUT

Replace.

14. Remove the parking brake cable holder and the Anti-lock Brake sensor wire clamp.
1 5. Loosen the ball joint nut, then separate the toe control arm from the knuckle using the special tool (see section 18).
16. Remove the damper fork bolt.
17. Remove the ball joint nut using the special tool and separate the lower control arm from the knuckle (see section 18).
18. Remove the right driveshaft from the intermediate shaft.
Corrosion resistant bolt/nut
SELF-LOCKING NUT

Replace.
DAMPER FORK BOLT

PARKING

BRAKE

CABLE
DRIVESHAFT ANTI-LOCK

BRAKE

SENSOR

WIRE/CLAMP
LOWER

CONTROL
ARM
CASTLE NUTTOE CONTROL ARM

(cont'd)

CASTLE

NUTProCarManuals.com

Transmission Assembly

Removal (cont'd)

19. Remove the intermediate shaft heat cover and the intermediate shaft mounting bolts.
20. 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.

INTERMEDIATE SHAFT

SUPPORT BASE

SET RING
Replace.

INTERMEDIATE SHAFT

21. Remove the parking brake cable holder and the Anti-lock Brake sensor wire clamp.
22. Scribe a reference mark on the flange of the adjusting bolt, adjusting cam and lower control arm.
23. Loosen the ball joint nut, then separate the toe control arm from the knuckle using the special tool (see section 18).
24. Remove the damper fork bolt.
25. Remove the bolts and lower control arm from the side beam.
26. Remove the left driveshaft from the differential.
27. 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.

INTERMEDIATE SHAFT

MOUNTING BOLT

INTERMEDIATE SHAFT

HEAT COVER

DAMPER FORK BOLT
TOE CONTROL ARM

LOWER CONTROL ARM
ADJUSTING

BOLT
ADJUSTING

CAM


SET RING

Replace.
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28. Remove the one of the upper control arm mounting bolts.
29. Remove the lower cover, change wire bracket and upper cover.
30. Remove the shift cable and select cable.
31. Remove the slave cylinder from the transmission. NOTE: Do not operate the clutch pedal once the slave
cylinder has been removed.
32. 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

ASSEMBLY

UPPER COVER

COTTER PIN
Replace.

SHIFT CABLE

UPPER ARM MOUNTING

BOLT
CHANGE WIRE

BRACKET

33. Remove the clutch housing cover.
34. Attach a chain hoist to the transmission hangers.
35. Place a jack under the transmission and raise the transmission just enough to take weight off mounts.
36. 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.
37. Remove the rear transmission mounting bolts and engine stiffener.
38. Remove the transmission housing mounting bolts.
39. Pull the transmission away from the engine until it clears the mainshaft, then lower it on the transmission jack.
SELECT CABLE

LOWER COVER

RELEASE FORK

Corrosion resistant bolt/nut
REAR TRANSMISSION

MOUNT

REAR TRANSMISSION

MOUNTING BOLT
TRANSMISSION JACK
TRANSMISSION HOUSING
MOUNTING BOLT
ENGINE STIFFENER
CLUTCH HOUSING

COVER
FRONT ENGINE MOUNTING

BOLT (Transmission side
)

FRONT ENGINE MOUNTING

BOLT (Engine side
)

TRANSMISSION HOUSING

MOUNTING BOLTSProCarManuals.com

CLUTCH RELEASE HANGER
RELEASE HANGER SPRING
RELEASE BEARING GUIDE
40 x 68 x 12.5 mm OIL SEAL
Replace.
10 x 20 mm DOWL PIN

CLUTCH HOUSING

SPEED SENSOR
SENSOR DUMMY COVER O-RING

Replace.

HOLDER PLATE
REVERSE SHIFT FORK ASSEMBLY Disassembly/Reassembly, page
13-16

REVERSE IDLE GEAR SHAFT

ASSEMBLY Disassembly/Reassembly, page
13-15
OIL GUIDE RING

90 mm WASHER
BEARING OUTER RACE
DIFFERENTIAL ASSEMBLY See section 15
OIL GUIDE PLATE
44 x 72 x 23 mm NEEDLE BEARING
BEARING RETAINING PLATE
COUNTERSHAFT ASSEMBLY Index, page
13-29

MAINSHAFT ASSEMBLY

Index, page

13-23
75 mm SPRING WASHER
32 x 46 x 7 mm OIL SEAL

Replace.
TRANSMISSION MAGNET

SHIFT FORK ASSEMBLY Disassembly/Reassembly, page
13-22

OIL PUMP ASSEMBLY
Disassembly/Reassembly, page
13-37

CHANGE HOLDER ASSEMBLY
Disassembly/Reassembly, page
13-19

UPPER COVER
SELECT LEVER ASSEMBLY
Removel, page
13-17 Installation, page 13-43
REVERSE SHIFT ARM
14x20 mm DOWEL PHIS

14 x 20 mm DOWEL PIN

Clean all parts thoroughly in solvent and dry with compressed air.

Illustrated Index

Lubricate all parts with oil before reassembly.

NOTE:
This transmission uses no gaskets between the major housings; use P/N 08718 — 0001 sealant.
Assemble the housings within 20 minutes after applying the sealant and allow it to cure at least 30 minutes after

assembly before filling the transmission with oil.
Always clean the magnet whenever the transmission housing is disassembled.
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BEARING OUTER RACE

75 mm THRUST SHIM

Selection.

CLAMP
BACK-UP LIGHT SWITCH
25 N·m (2.5 kg-m, 18 Ib-ft)
CLAMP
TRANSMISSION HANGER A
TRANSMISSION HANGER B

STAY

WASHER

Replace.

OIL FILLER PLUG
45 N·m (4.5 kg-m, 33 Ib-ft)
42 x 63 x 12.5 mm OIL SEAL
Replace.

WASHER

Replace.

DRAIN PLUG
40 N·m (4.0 kg-m, 29 Ib-ft) 36 mm SEALING BOLT
35 N·m (3.5 kg-m. 25 Ib-ft)
STRAINER COVER O-RING

Replace.

STRAINER SET SPRING
OIL PUMP STRAINER
14 mm SEALING BOLT
33 N·m (3.3 kg-m. 24 Ib-ft)
SPRING (L. 25 mm)
STEEL BALL (LARGE) 16 mm SEALING BOLT
42 N·m (4.2 kg-m, 30 Ib-ft) SPRING (L. 24.2 mm)
16 mm SEALING BOLTS
42 N·m (4.2 kg-m, 30 Ib-ft)
SPRING (L. 30 mm)
STEEL BALL (SMALL)
SHIFT LEVER ASSEMBLY
0 Removal, page
13-17

• Installation, page 13-43

NEUTRAL SWITCH

25 N·m (2.5 kg-m, 18 Ib-ft)

TRANSMISSION HOUSING
OIL GUIDE PLATE

82 mm THRUST SHIM
• Selection, page
13-41
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