1991 ACURA NSX clutch

5. Install the side engine mount, then tighten the bolts
in the numbered sequence as shown ( - ),

12 x
1.26
mm

73 N·m
(7.3 kg-m,
53 Ib-ft)

Replace.
12 x
1.25
mm

95 N·m
(9.5 kg-m,
69 Ib-ft)

SIDE ENGINE

MOUNT

6. Tighten the transmission mount mounting bolt.

MOUNTING BOLT
12 x
1.25
mm

95 N·m (9.5 kg-m, 69 Ib-ft)
7. Tighten the rear mount mounting bolt.
MOUNTING BOLT

12 x
1.25
mm

77 N·m (7.7 kg-m, 56 Ib-ft)
Replace.

Check that the spring clip on the end of each
driveshaft clicks into place.
CAUTION: Use new spring clips.
Bleed air from the cooling system (see page 10-5).
Bleed air from the brake lines {see section 19).
Check the clutch pedal free play (see section 12).

Adjust the clutch guide assemblies when disas-

sembling clutch (see section 12).

Check that the transmission shifts into gear

smoothly.

Adjust the alternator belt (see section 23).
Adjust the A/C compressor belt (see section 22).
Clean battery posts and cable terminals with
sandpaper, assemble, then apply grease to pre-
vent corrosion.
Inspect for fuel leakage (see section 11). After assembling the fuel line parts, turn on
the ignition switch (do not operate the starter) so that the fuel pump operates for approxi-
mately two seconds and the fuel line pressu-
rizes. Repeat this operation two or three times
and check for fuel leakage at any point in the

fuel line.

Check and adjust wheel alignment (see section 18).

Refill the engine with engine oil (see page 8-4 ('91-'92
Models), ('93-Model),or ('94-'96 Models).

Refill the transmission with oil/fluid (see section

13 or
14).ProCarManuals.com

Idle Contro l Syste m
Air Conditionin g Signa l
(From pag e 11-117 )
I s ther e a clickin g nois e fro m th e
A/ C compresso r clutch ?
Chec k fo r th e operatio n o f th e
A/C :1. Star t th e engine .
2 . Tur n th e blowe r switc h ON .
3 . Tur n th e A/ C switc h ON .
Doe s th e A/ C operate ?
Ai r conditionin g signa l i s OK . A/
C CLUTC H RELA Y 4P CONNECTO R
Chec k fo r a n ope n in th e wire :
Momentaril y connec t th e No . 4 ter -
mina l o f th e 4 P connecto r o n th e
A/ C clutc h rela y t o bod y groun d
severa l times .
WIRE SID E O F
FEMAL E TERMINAL S
I s ther e a clickin g nois e fro m th e
A/ C compresso r clutch ? Se
e ai r conditione r inspectio n (se e
sectio n 22 ).
Repai r ope n in th e wir e betwee n
th e EC M (AS ) an d th e A/ C clutc h
relay.
ECM CONNECTOR S
Chec k fo r a n ope n in th e wire :
Measur e voltag e betwee n EC M
connecto r terminal s C 2 an d A26 . WIR
E SID E O F FEMAL E TERMINAL S
I s voltag e les s tha n 1. 0 V ? Repai
r ope n in th e wir e betwee n
th e EC M (C2 ) an d th e A/ C switch .
Substitut e a known-goo d EC M
an d recheck . I f symptom/indi -
catio n goe s away , replac e th e
origina l ECM .
Se e th e ai r conditione r inspec -
tio n (se e sectio n 22 ).
ProCarManuals.com

Idle Contro l Syste m
Clutch Switc h Signa l (M/T )
This signal s th e EC M whe n th e clutc h is engaged .
Inspection o f clutc h switc h signal .
Chec k fo r a n ope n in th e circuit :
1. Tur n th e ignitio n switc h O N (II) .2. Measur e voltag e betwee n EC M
connecto r terminal s C 4 an d
A26.
Is voltag e les s tha n 1. 0 V ?
Chec k fo r shor t i n th e circuit :
1 . Depres s th e clutc h pedal .
2 . Measur e voltag e betwee n EC M
connecto r terminal s C 4 an d
A26.
(To pag e 11-125 ) EC
M CONNECTOR S
Chec k th e clutc h switch :
1. Tur n th e ignitio n switc h OFF .2. Disconnec t th e 3 P connecto r
fro m th e clutc h switch .
3 . Chec k fo r continuit y betwee n
th e clutc h switc h connecto r
terminal s No . 1 an d No . 3 . WIR
E SID E O F FEMAL E TERMINAL S
CLUTC H SWITC H 3 P CONNECTO R
TERMINA L SID E O F MAL E TERMINAL S
I s ther e continuity ? —
Adjus t th e clutc h switch .
— Replac e th e clutc h switch .
CLUTC H SWITC H 3 P CONNECTO R
WIR E SID E O F FEMAL E TERMINAL S
I s ther e approx . 5 V ? Repai
r ope n i n th e wir e betwee n
th e EC M (C4 ) an d th e clutc h
switch .
Repai r ope n in BL K wir e betwee n
th e clutc h switc h an d G40 1
(locate d behin d lef t kic k panel) .
Chec
k fo r a n ope n in th e wire :
1. Tur n th e ignitio n switc h O N (II) .2. Measur e voltag e betwee n th e
clutc h switc h connecto r termi -
nal No . 1 an d bod y ground .
ProCarManuals.com

Starter Switch Signal

This signals the ECM when the engine is cranking.

Inspection of Starter Switch Sig-

nal.
NOTE:

• M/T: Clutch pedal must be depressed.

• A/T: Transmission in position.

ECM CONNECTORS

Measure voltage between ECM

connector terminals C6 and A26

with the ignition switch in the

start position.

WIRE SIDE OF FEMALE TERMINALS

Is there battery voltage?

Is the fuse OK?
Repair short in the wire

between the ECM (C6) and

the No. 7 STARTER SIGNAL

(7.5 A) fuse or the PGM-FI

main relay.

Replace the No. 7 STARTER

SIGNAL (7.5 A) fuse.
Starter switch signal is OK.

Repair open in the wire between

the ECM
(C6)
and the No. 7

STARTER SIGNAL (7.5 A) fuse.
Inspect the No. 7 STARTER SIG-

NAL (7.5 A) fuse in the under-

dash fuse box.ProCarManuals.com

Special Tools

Ref.No.
Tool Number

07LAB — PV00100 or
07924 — PD20003
07MAF—PR80100

07746 — 0010200

07749 — 0010000

07936 — 3710100
Description

Ring Gear Holder

Clutch Alignment Shaft

Attachment, 37 x 40 mm

Driver

Handle
Qty

Page Reference
12-10, 17,
18, 19

12-18, 19
12-17
12-17
12-18, 19

1
1
1

1

1ProCarManuals.com

Illustrated Index

NOTE:
Whenever the transmission is removed, clean and grease the release bearing sliding surface.
If the parts marked * are removed, the clutch hydraulic system must be bled.
Bleed the clutch hydraulic system (see page 12-6).
Inspect the hoses for damage, leaks, interference, and twisting.

FLYWHEEL
Inspection, page 12-16

Replacement,
page 12-17

MID PLATE
Removal, page 12 -10
Inspection, page 12 -13
Installation, page 12 -18
2ND CLUTCH DISC Removal, page 12-10
Inspection, page 12-12
Installation, page 12-18

DAMPER

WASHER
PRESSDRE PLATE

Removal, page 12-10 Inspection, page 12-11

Installation, page 12-18

TRANSMISSION

1ST CLUTCH DISC

Removal. page 12-10 Inspection, page 12-12
Installation, page 12-18

SPRING

COLLAR

RELEASE BEARING
Removal, page 12-10

Inspection, page 12-11

Installation, page 12-18

RELEASE FORK

SLAVE CYLINDER •CLUTCH DAMPER
COTTER PIN

Replace.

0-RING

Replace.

*RESERVOIR HOSE
ASSIST SPRING
CLUTCH MASTER CYLINDER
MID PLATE GUIDE

Inspection. page 12 -13

Initialization. page 12-14

Replacement, page 12-15

*15 N·m
(1.5 kg-m.11 lb-ft)

*RESERVOIR

*19 N·m (1.9 kg-m.

14 lb-ft)
*CLUTCH PIPE
*19 N·m
(1.9 kg-m,
14 Ib-ft)
*CLUTCH

HOSE

CLEVIS PIN
DOWEL PINProCarManuals.com

Clutch Peda l
Adjustmen t
NOTE:
• T o chec k th e switch , se e sectio n 23 .
• Th e clutc h i s self-adjustin g t o compensat e fo r wear .
CAUTION : I f ther e i s n o clearanc e betwee n th e
maste r cylinde r pisto n an d pus h rod , th e releas e
bearin g is hel d agains t th e diaphrag m spring , whic h
ca n resul t i n clutc h slippag e o r othe r clutc h
problems .
1. Loose n locknu t A , an d bac k of f th e peda l switc h
until i t n o longe r touche s th e clutc h pedal .
2. Loose n locknu t C , an d tur n th e pus h ro d in o r ou t t o
ge t th e specifie d strok e an d heigh t a t th e clutc h
pedal.
3. Tighte n locknu t C .
4. Threa d in th e clutc h peda l switc h A in unti l i t con -
tacts th e clutc h pedal .
5. Tur n th e switc h in 1/ 4 — 1/2 tur n further .
6. Tighte n locknu t A .
7. Loose n locknu t B an d peda l switc h B .
8 . Measur e th e clearanc e betwee n th e floo r boar d an d
clutc h peda l wit h th e clutc h peda l full y depressed .
9. Releas e the clutc h peda l 15-20 m m (0.59-0.7 9
in) fro m th e full y depresse d position , an d hol d i t
there . Adjus t th e positio n o f peda l switc h B so tha t
the engin e wil l star t wit h th e clutc h peda l i n thi s
position .
10. Threa d in peda l switc h B in 1/ 4 — 1/2 tur n further .
11. Tighte n locknu t B .
LOCKNU T C
1 8 N- m (1. 8 kg-m , 1 3 Ib-ft ) LOCKNU
T B
1 0 N- m (1. 0 kg-m , 7 Ib-ft )CLUTC H PEDA LSWITCH B
ASSIS T SPRIN G
CLUTCH PEDA LSWITCH A
LOCKNU T A10 N- m (1. 0 kg-m , 7 Ib-ft )
(STROK E a t PEDAL) : 12 5 m m (4.9 2 in )
(TOTA L CLUTC H PEDA L FREE PLAY) : 9-15 mm (0.35-0.5 9 in) include s the peda l pla y 1 -7 m m (0.04-0.2 8 in)
(CLUTC H PEDA L HEIGHT) : 176. 2 m m (6.9 4 in ) t o th e floor .
(CLUTC H PEDA L DISENGAGEMEN T HEIGHT) : 9 2 m m (3.6 2 in ) minimu m to th e floor .
CLUTC H MASTE R CYLINDE R
ProCarManuals.com

Clutch Maste r Cylinde r
Removal
1. Disconnec t th e clutc h pip e fro m th e clutc h maste r
cylinder .
2. Pr y ou t th e cotte r pin , an d pul l th e clevi s pi n ou t o f
the clevis .
3 . Remov e th e nuts .
COTTE R PI N
Replace .
CLEVI S PI N
4. Remov e th e reservoi r fro m th e fron t compartment ,
then remov e th e clutc h maste r cylinder .
5. Disconnec t th e reservoi r hos e fro m th e clutc h
maste r cylinder , the n remov e th e reservoir .
CAUTION :
• Avoi d spillin g brak e flui d o n pain t a s i t ma y
damag e th e finish .
• Plu g th e en d o f th e clutc h pip e an d reservoi r
hos e wit h a sho p towe l t o preven t flui d fro m
flowin g ou t o f th e clutc h pip e an d reservoi r hos e
afte r disconnecting .
CLUTCH PIP E
CLUTC HMASTE R
CYLINDE R RESERVOI
R HOS E
RESERVOI R
Installation
1. Instal l th e clutc h maste r cylinde r i n th e revers e
orde r of removal .
NOTE : Blee d th e clutc h hydrauli c syste m (se e
pag e 12-6 ).
RESERVOI R CA P
RESERVOI R SEA L
6 x 1. 0 m m10 N- m (1. 0 kg-m ,7 Ib-ft )
FLOA T
RESERVOI R
10 N- m (1. 0 kg-m , 7 Ib-ft )
CLUTC H MASTE R CYLINDE R
Inspect th e cylinde r wal lfor scorin g an d wear .
RESERVOI RHOSE
22 N- m(2.2 kg-m ,16 Ib-ft )
COTTE R PI N
Replace .
HOSE JOIN T
1 0 N- m (1. 0 kg-m , 7 Ib-ft )
NUTS
CLEVI S PI N
WASHE RReplace .
ProCarManuals.com