1991 ACURA NSX bolt pattern

Service Precaution s
Handling o f Specia l Nut s an d Bolt s
Becaus e man y section s o n thi s ca r ar e constructe d wit h
aluminu m alloys , us e onl y th e specia l "Dacro " typ e
nut s an d bolt s recommende d b y Acura .
NOTE:
Dacro finis h ca n b e identifie d b y gra y plating .
Som e Dacr o finis h bolt s hav e a gree n coatin g o n
th e threa d sectio n of the bol t fo r easie r applica -
tion . Thi s typ e of bol t i s calle d a "Torquer " bolt .
Us e o f othe r type s of nut s an d bolt s ma y caus e
electrolysi s an d corrosion , whic h in tur n coul d
caus e th e bol t t o loosen .
Gray platin g
Green coatin g
on th e thread s
Gray plating : "Dacro " typ e
Gra y platin g + Gree n coatin g o n th e threads :
"Torquer " typ e
1. Whe n replacin g nut s an d bolts , us e onl y th e sam e
type.
2. Tighte n th e nut s an d bolt s with a torqu e wrenc h t o
th e specification s provide d i n thi s manual .
3 . Clea n al l threa d ridge s wit h a non-wire-typ e bristl e
brush . Foreig n matte r i n th e thread s ma y caus e th e
bol t t o loosen .
4 . Section s o n thi s ca r requirin g th e us e o f Dacr o nut s
and bolt s wil l b e indicate d b y a ( ) in thi s manual .
Handling o f Tire s
The tire s o n NS X & NSX- T shoul d no t b e rotated . Th e
fron t wheel s ar e 16 " in , diamete r an d th e rea r wheel s
ar e 17 " in , s o the y canno t b e rotate d front-to-rear .
Th e original-equipmen t tire s o n NS X & NSX- T hav e
a unidirectiona l trea d pattern , s o the y canno t b e ro -
tate d side-to-side .
Th e foldin g spar e tir e canno t b e repaire d o r remove d
fro m th e rim .
Engin e Steam-cleanin g
(NSX-T only )
When steam-cleanin g th e engin e compartment , kee p th e
roo f holde r switc h dry . I f th e roo f holde r switc h get s we t
accidentally , dr y i t thoroughl y wit h compresse d air .
Roo f holde r switc h
ProCarManuals.com

28. Tighten bolts and nuts finger tight at six points as

shown below.

29. Starting with nut torque all bolts and nuts, in a

clockwise pattern in three steps.

NOTE: Excessive tightening can cause distortion of

oil pan gasket and oil leakage.

Torque: 14 N-m (1.4 kg-m, 10 lb-ft)ProCarManuals.com

6. Install the release bearing on the pressure plate.

7. Install the pressure plate.
NOTE:
Align the mark on the mid plate with the mark onthe pressure plate.
After installing, make sure the release bearing is
secure.

Align the marks.

PRESSURE PLATE

RELEASE BEARING

PRESSURE PLATE

(P/N 08798-9002)
RELEASE

BEARING
Place the diaphragm spring fingers

in the groove of the release bearing.
9. Remove the special tools.

10. Initialize the mid plate guides (see page 12-14

('93-'96), 12-16 ('91-'92 Models).
MOUNTING BOLT

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

8. Torque the mounting bolts in a crisscross pattern
as shown. Tighten them several steps to prevent

warping the diaphragm spring.

NOTE: Place the diaphragm spring fingers in the
groove of the release bearing.ProCarManuals.com

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 position

switch, differential speed sensor and vehicle speed

sensor (VSS).

VSS

(O-RING Replace.)
NEUTRAL

POSITION

SWITCH

DIFFERENTIAL

SPEED SENSOR

BACK-UP LIGHT SWITCH

2. Remove the sealing bolts, springs and steel balls.

3. Remove the transmission housing attaching bolts

in a crisscross pattern in several steps.

4. Remove the 36 mm sealing bolt.

SPRING

(L. 25 mm)

ATTACHING

BOLT
.14 mm SEALING BOLT

36 mm SEALING BOLT

STEEL BALL (3/8 in)

12 mm SEALING

BOLT

16 mm SEALING

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

ing, and remove it from the groove using a pair of

snap ring plier.

SNAP RING PLIER

SNAP RING

6. Separate the clutch housing from the transmission

housing.

7. Remove the thrust shim and oil guide plate from the

transmission housing.

THRUST SHIM

OIL GUIDE

PLATE

TRANSMISSION HOUSING
SPRING

(L.
24.2
mm)

STEEL

BALLS (5/16 in)ProCarManuals.com

I
Oil Seal

Removal

16. Tighten the mounting bolts in a crisscross pattern
in several steps.

8 x 1.0 mm SPECIAL BOLTS

40 N·m
(4.0 kg-m,
29 Ib ft)
1. Remove the differential assembly.
2. Remove the oil seat from the transmission housing.

OIL SEAL

Replace.

DIFFERENTIAL

INSPECTION TOOLS

07MAJ–PR90100

BENCH

VISE

TRANSMISSION HOUSING

112 mm shim adjustment
17. Measure the preset torque (see page 15-4),
Standard:
60-140
N·m
(6-14
kg-m.
43-101
Ib-ft)

112 mm SHIM Standard shim3. Remove the oil seal from the clutch housing.

A
B

C

D
E

F
H

J
Part Number

41261
—PR8—000

41262—PR8—000

41263—PR8—000

41264—PR8—-000

41265—PR8—000

41266— PR8—000

41267—PR8—000
41268—PR8—000

41269—-PR8—000

41270—PR8—000
Thickness

1.2 mm (0.0472 in)

1.4 mm (0.0551 in)

1.6 mm (0.0630 in)

1.8 mm (0.0709 in)

2.0 mm (0.0787 in)

2.2 mm (0.0866 in)

2.4 mm (0.0945 in)

2.6 mm (0.1024 in)

2.8 mm (0.1102 in)

3.0 mm (0,1181 in)
If the preset torque is more than the standard,
select a thinner 112 mm shim, and recheck the
preset torque.
If the preset torque is less than the standard,
select a thicker 112 mm shim, and recheck the
preset torque.

CLUTCH HOUSING

OIL SEAL
Replace.
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\
I



Clutch Disc, Clutch Plate

Replacement

NOTE: The clutch discs and clutch plates should be
replaced as a set.
1. Remove the clutch discs and clutch plates (see

page15-20).

2. Soak the clutch discs for five minutes in transmis-
sion oil.
3. Install the clutch discs, clutch plates, and a stan- dard shim.
NOTE: Position the 112 mm thrust Shim with the
thickness size mark facing away from the clutch

discs.

112 mm THRUST SHIM
Standard shim

A
B

C

D
E
F

G
J

Part Number

41261-PR8-000
41262-PR8-000
41263-PR8-000

41264-PR8-000
41265-PR8-000

41266-PR
8-000

41267-PR8-000

41268-PR8-000

41269-PR8-000

41270-PR8-000
Thickness

1.2 mm (0.0472 in)

1.4 mm (0.0551 in)
1.6 mm [0.0630 in)

1.8 mm (0.0709 in)

2.0 mm (0.0787 in)
2.2 mm (0,0866 in)
2.4 mm (0,0945 in)
2.6 mm (0.1024 in)
2.8 mm (0.1102 in)
3.0 mm (0.1181 in)


Measure

41.7– 41.9
mm

(1.642 – 1.650 In)
112 mm THRUST SHIM

FINAL

DRIVEN

GEAR

4. Install the differential housing.
NOTE: Tighten the bolts evenly in several steps,
then torque them in a crisscross pattern.
Torque: 40 N·m (4.0 kg-m. 29 Ib-ft)
5. Make sure the preset torque is within the standard (see page 15-18)
6. If preset torque is beyond the standard, replace the 112 mm thrust shim as necessary.ProCarManuals.com

SEALING

BOLT

STEEL

BALLS (5/16 in)

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 position
switch and vehicle speed sensor (VSS).

NEUTRAL

POSITION

SWITCH

VSS

(O-RING Replace .)
BACK-UP LIGHT SWITCH36 mm SEALING BOLT
SPRING

(L. 25 mm)

ATTACHING BOLTS

2. Remove the sealing bolts, springs and steel balls.

3. Remove the transmission housing attaching bolts in a criss-cross pattern in several steps.
4. Remove the 36 mm sealing bolt.
STEEL BALL (3/8 in)
SPRING
(L.
25.1
mm)
SPRING
(L. 30 mm)

TRANSMISSION HOUSINGTHRUST SHIM
OIL GUIDE

PLATE

6. Separate the clutch housing from the transmission
housing. SNAP RINGSNAP 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 plier.
7. Remove the thrust shim and oil guide plate from the transmission housing.ProCarManuals.com

15. Tighten the transmission housing attaching bolts in
a criss-cross pattern in several steps shown below.

Torque: 45 N .
m (4.5 kg-m, 33 Ib-ft)

16. Install the 36 mm sealing bolt.
NOTE: Apply liquid gasket (P/N 08718–0001) to

the flange.
17. Install the steel balls, springs, and sealing bolts. NOTE: Apply liquid gasket (P/N 08718–0001) to
the threads, but don't plug the hole with liquid
gasket.

14 x 1.0 mm SEALING BOLT

33 N .
m (3.3 kg-m. 24 Ib-ft)

STEEL BALL
(3/8
in)

SPRING (L. 25 mm)

36 mm SEALING BOLT
35 N.
m (3.5 kg-m, 25 Ib-ft)
SPRING
(L.
25.1
mm)

SPRING
(L. 30 mm)

16 x 1.0 mm

SEALING BOLTS

42 N .
m

(4.2 kg-m,

30 Ib-ft)

STEEL BALLS

(5/16
in)

SPRING
(L. 30 mm)
18. Install the back-up light switch and neutral position

switch.

NOTE: Apply liquid gasket (P/N 08718–0001) to
the threads.
19. Install the vehicle speed sensor (VSS).

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

VSS
(O-RING Replace.)
8 x
1.25
mm

24 N .
m (2.4 kg-m, 17 Ib-ft)
NEUTRAL POSITION

SWITCH

25 N.
m
(2.5 kg-m,

18 Ib-ft)
BACK-UP LIGHT SWITCH
25 N .
m (2.5 kg-m,18 Ib-ft)

8x1.25 mm

24 N .
m (2.4 kg-m, 17 Ib-ft)

8 x
1.25
mm

26 N
.
m
(2.6 kg-m,

19 Ib-ft)ProCarManuals.com