1991 ACURA NSX Service Repair Manual

Emission Contro l Syste m
Evaporativ e Emissio n (EVAP ) Control s (cont'd )
(From pag e 11-155 ) VACUUM/PRESSUR
E GAUG E0-4 in.H g07JAZ–001000A
PURG E AI RHOS E
PURG EHOSE
Connec t a vacuu m gaug e t o
purg e ai r hose .
Star t th e engin e an d rais e spee d to
3,50 0 rpm .
Does vacuu m appea r o n gaug ewithin 1 minut e ?
Se e EVA P tw o wa y valv e tes t t o
complete .
Evaporativ e emissio n contro l ar e
OK .
Connec t a vacuu m gaug e t o th e
caniste r purg e hos e an d rais e th e
engin e spee d to 3,50 0 rpm .
Does vacuu m appea r o n th egauge ?
Replac e th e EVA P contro l
canister . Inspec
t th e purg e hos e
an d throttl e bod y por t
fo r pinc h o r blockage .
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Evaporative Emissio n (EVAP ) Tw o Wa y Valv e Testin g
1. Remov e the fue l fill cap .
2. Remov e vapo r lin e fro m th e fue l tan k an d connec t
t o T-fittin g fro m vacuu m gaug e an d vacuu m pum p
a s shown .
PRESSUR E SID E
3. Appl y vacuu m slowl y an d continuousl y whil e wat -
chin g th e gauge .
Vacuu m shoul d stabiliz e momentaril y a t 5 to 1 5
mmH g (0. 2 t o 0. 6 in.Hg) . 5
. Slowl y pressuriz e th e vapo r lin e whil e watchin g th e
gauge .
Pressur e shoul d stabiliz e a t 1 0 to 3 5 mmH g (0. 4 to
1. 4 in . Hg) .
VACUUM/PRESSUR E GAUG E0-4 in . Hg07JAZ–001000A
VACUU M PUMP /GAUG EA973X–041–XXXXX
T-FITTIN G
If vacuu m stabilize s (valv e opens ) belo w 5
mmH g (0. 2 in . Hg ) o r abov e 1 5 mmH g (0. 6 in .
Hg) , instal l ne w valv e an d retest .
4 . Mov e vacuu m pum p hos e fro m vacuu m to pressur e
fitting, and mov e vacuu m gaug e hose from vacuu m
t o pressur e sid e a s shown . I
f pressur e momentaril y stabilize s (valv e opens )
a t 1 0 to 3 5 mmH g (0. 4 to 1. 4 in . Hg) , th e valv e
is OK .
If pressur e stabilize s belo w 1 0 mmH g (0. 4 in .
Hg ) o r abov e 3 5 mmH g (1. 4 in . Hg) , instal l a
ne w valv e an d retest .
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Transmission Assembly

Removal

CAUTION: Use fender covers to avoid damaging

painted surfaces.
1. Check and record the rear wheel alignment (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 4. Remove the strut bar.
5. Remove the air cleaner assembly.
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 positionswitch.
9. Disconnect the starter motor cables, then remove the starter motor.
10. Remove the transmission mount.
11. Remove the two transmission housing bolts.
TRANSMISSION HOUSING BOLTS

BACK-UP

LIGHT SWITCH

CONNECTOR

WIRE HARNESS HOLDER

STARTER MOTOR

CABLES
NEUTRAL

POSITION
SWITCH

CONNECTOR

STARTER
MOTOR
TRANSMISSION

GROUND

CABLE

TRANSMISSION
MOUNT
MOUNTING

BOLTS
TRANSMISSION

HANGER
TRANSMISSION
MOUNTING BOLTS
JUMPER

CONNECTOR

VEHICLE SPEED

SENSOR (VSS)

CONNECTOR

CONTROL BOX

Make sure lifts are placed properly, and

hoist brackets are attached to correct position (see sec-

tion 1).ProCarManuals.com

12. Remove the parking brake cable holders from the rear beam rod.

13. Remove the rear beam rod.

14. Remove the front exhaust pipe A.

Corrosion resistant bolt/nut

EXHAUST
PIPE ASELF-LOCKING NUT
Replace.
GASKET

Replace.

GASKET
Replace.
REAR BEAM ROD
1 5. Remove the parking brake cable holder and the wheel sensor wire clamp. 16. Remove the bolt and separate the toe control arm from the side beam (see section 18).
17. Remove the damper fork bolt (see section 18). 18. Remove the bolts and separate the lower control arm from the side beam (see section 18).
19. Pry the driveshaft out of the differential. Pull and remove it. SELF-LOCKING NUT

Replace.
PARKING BRAKE
CABLE HOLDERS
PARKING BRAKE
CABLE HOLDER
FLANGE BOLT
SIDE BEAM TOE CONTROL ARM
SELF-LOCKING NUT Replace. SELF-LOCKING NUT

Replace.

WHEEL SENSOR
WIRE CLAMP
DAMPER FORK BOLT

ADJUSTING

CAM
DRIVESHAFT

ADJUSTING BOLT SELF-LOCKING NUT
Replace.
LOWER CONTROL

ARM

(cont'd)

Corrosion resistant bolt/nutProCarManuals.com

Transmission Assembly

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:

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
SET RINGReplace.
INTERMEDIATE SHAFT
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
WHEEL SENSOR WIRE CLAMP
LOWER CONTROL ARM SELF-LOCKING NUTReplace. ADJUSTING

BOLT
ADJUSTING

CAM

SELF-LOCKING NUT
Replace.SET RING
Replace.TOE CONTROL ARM
PARKING BRAKE
CABLE HOLDER
FLANGE BOLT
TOE CONTROL ARM
SELF-LOCKING NUT
Replace. INTERMEDIATE SHAFT

MOUNTING BOLT

INTERMEDIATE SHAFT
HEAT COVERProCarManuals.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.
UPPER CONTROL ARM
DAMPER

SLAVE CYLINDER

UPPER COVER

UPPER ARM MOUNTING

BOLT

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.
REAR TRANSMISSION
MOUNT
REAR TRANSMISSIONMOUNTING BOLT
TRANSMISSION JACK TRANSMISSION HOUSINGMOUNTING BOLT
ENGINE STIFFENER
CLUTCH HOUSING

COVER

TRANSMISSION HOUSING
MOUNTING BOLTS
FRONT ENGINE MOUNTING

BOLT
(Engine side)

FRONT ENGINE MOUNTING

BOLT
(Transmission side)

RELEASE FORK

COTTER PIN
Replace.

SHIFT CABLE

CHANGE WIRE

BRACKET

SELECT CABLE
LOWER COVER

Corrosion resistant bolt/nut

Corrosion resistant bolt/nutProCarManuals.com

Illustrated Index
Clean all parts thoroughly in solvent and dry with compressed air. Lubricate all parts with oil before reassembly.
NOTE: This transmission uses no gaskets between the major housings; use liquid gasket (P/N 08718—0001).If 20 minutes have passed after applying liquid gasket, reapply it and assemble the housings 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.
Disassembly/Reassembly, page13-22
Disassembly/Reassembly, page 13-37
Disassembly/Reassembly, page 13-19
Removel, page 13-17
Installation, page 13-43

REVERSE SHIFT ARM 14 x 20 mm DOWEL PIN
10 x 20 mm DOWEL PIN
CLUTCH RELEASE HANGER
RELEASE HANGER SPRING
RELEASE BEARING GUIDE
40 x 68 x 12.5 mm OIL SEAL
Replace. 14 x 20 mm DOWEL PIN

CLUTCH HOUSING

VEHICLE SPEED SENSOR (VSS)
SENSOR DUMMY COVER
O-RING
Replace.
RELEASE BEARING GUIDE COVER
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
Inspect for wear and operation.

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
OIL PUMP ASSEMBLYCHANGE HOLDER ASSEMBLY
UPPER COVER
SELECT LEVER ASSEMBLYProCarManuals.com