ACURA NSX 1991 Service Repair Manual

5. Screw two 8 x 1.0 mm bolts into the threaded holes

in the differential housing cover to push it away from

the final driven gear.

NOTE: Turn each bolt two turns at a time to pro-

vent cocking the differential housing cover exces-

sively.ProCarManuals.com

Reassembly
NOTE:
• I f th e limite d sli p differentia l clutc h se t wa s replaced ,
th e 6 5 m m shi m (differentia l housin g cove r side ) an d
11 2 m m shi m (differentia l housin g cove r side ) mus t
b e adjusted .
• Reassembl e th e part s in th e sam e orde r an d directio n
the y wer e befor e disassembly .
• Lubricat e th e clutc h dis c surfac e wit h transmissio n oil .
1 . Reassembl e th e part s a s show n below .
NOTE : Positio n th e 6 5 m m shi m wit h th e thicknes s
stam p mar k facin g up .
Differential
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Differential

Reassembly

2. Install the carrier assembly.

CARRIER

ASSEMBLY

DIFFERENTIAL

HOUSING

3. Install the final driven gear.

NOTE: Align the mark on the differential housing

cover with the mark on the final driven gear.

FINAL DRIVEN GEAR

MARK
4. Install the washers, thrust needle bearing, and cen-

tral gear.

CENTRAL GEAR

WASHERS
THRUST NEEDLE

BEARING

• 65 mm shim adjustment

5. Clean the gear end surface on the central gear.

6. Set the plastigauge (Blue) strip on the central gear

at four points in a crisscross pattern.

PLASTIGAUGES

MARKProCarManuals.com

7. Instal l th e washer , thrus t needl e bearing , 6 5 m m
shim , 11 2 m m shim , clutc h disc , an d sprin g plate .
NOTE :
• B e carefu l no t t o mov e th e plastigaug e whe n in -
stallin g th e washer .
• Positio n th e 6 5 m m shi m wit h th e thicknes s
stam p mar k facin g up .
SPRIN G
PLAT E
CLUTC HDISC
112 m m SHI M
65 m m SHI M
THRUS T NEEDL E
BEARIN G
WASHE R
Align th e marks , the n instal l th e differentia l housin g
cover.
DIFFERENTIA L HOUSIN G
COVE R
MARK
MAR K
9. Tighte n th e mountin g bolt s i n a crisscros s patter n
i n severa l steps .
8 x 1. 0 m m SPECIA L BOLT S
4 0 N- m (4. 0 kg-m , 2 9 Ib-ft )
BENC H
VIS E
DIFFERENTIAL
INSPECTIO N TOOL S
07MAJ-PR90100
10. Remov e th e part s show n below .
DIFFERENTIA LHOUSINGCOVER
CLUTC H DIS C
112 m m SHI M
65 m m SHI M
THRUS T NEEDL E
BEARIN G
WASHE R
SPRIN
G PLAT E
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Differential

Reassembly

11. Measure the widest part of the plastigauge.

Standard:
0.18-0.229
mm

PLASTIGAUGE STRIP

• If the plastigauge measures within the standard,

go to step 14.

• If the plastigauge does not measure within the

standard, continue with step 12.

12. Select the proper 65 mm shim based on the follow-

ing table.

• If the measurement was less than 0.18 mm, in-

stall a thinner shim.

• If the measurement was more than 0.229 mm,

install a thicker shim.

65 mm shim

13. After installing a thinner or thicker shim, be sure to

recheck the measurement with plastigauge.
• After installing a thinner shim:

If the measured value is less than 0.18 mm, select

the next thinner shim, and recheck.

If the new value is more than 0.229 mm, the

selected shim is OK.

• After installing a thicker shim:

If the measured value is more than 0.229 mm,

select the next thicker shim, and recheck.

If the new value is less than 0.18 mm, take the

shim you chose at the step 12.

14. Install the washer, thrust needle bearing, 65 mm

shim, 112 mm shim, clutch plate, clutch disc, and

spring plate.

NOTE: Position the 65 mm shim with the thickness

stamp mark facing up.

SPRING

PLATE

CLUTCH

DISC

112 mm SHIM

65 mm SHIM

THRUST NEEDLE

BEARING

WASHER

15. Align the marks, then install the differential housing

cover.

DIFFERENTIAL HOUSING

COVER

MARK

MARKProCarManuals.com

16. Tighte n th e mountin g bolt s i n a crisscros s patter n
i n severa l steps .
8 x 1. 0 m m SPECIA L BOLT S
4 0 N- m (4. 0 kg-m , 2 9 Ib-ft )
BENC H
VIS E
DIFFERENTIA LINSPECTION TOOL S07MAJ-PR9010 0
• 11 2 m m shi m adjustmen t
17 . Measur e th e prese t torqu e (se e pag e 15-4 ).
Standard :
60-140 N-m (6-1 4 kg-m ,
43-10 1 Ib-ft)
11 2 m m SHI M
Standar d shi m
If th e prese t torqu e i s mor e tha n th e standard ,
selec t a thinne r 11 2 m m shim , an d rechec k th e
prese t torque .
I f th e prese t torqu e i s les s tha n th e standard ,
selec t a thicke r 11 2 m m shim , an d rechec k th e
prese t torque .
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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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Bearing Preload

Adjustment

NOTE: If any of the items listed below are replaced, the

bearing preload must be adjusted.

TRANSMISSION HOUSING

CLUTCH HOUSING

DIFFERENTIAL

TAPERED ROLLER BEARING and OUTER RACE

75 mm THRUST SHIM

90 mm WASHER

OIL GUIDE RING

1. Remove the bearing outer race and 75 mm thrust

shim from the transmission housing by prying up

on the bearing outer race or by heating the housing

to about 212°F (100°C).

CAUTION: Do not reuse the thrust shim if the

outer race was pried out.

NOTE:

• If the outer race was removed by heating the

case, let the transmission cool to room tempera-

ture before adjusting the bearing preload.

• Do not heat the transmission housing in excess

of 212° F (100°C).

• Replace the bearing with a new one whenever

the outer race is replaced.

• Repeat on the clutch side.ProCarManuals.com

2. Instal l th e standar d shi m an d bearin g oute r rac e in -
t o th e transmissio n housin g usin g th e specia l tool s
a s shown .
CAUTION : D o no t us e mor e tha n on e shi m to ad -
jus t th e bearin g preload .
NOTE:
• Instal l th e bearin g oute r rac e squarely .
• Chec k tha t ther e i s n o clearanc e betwee n th e
bearin g oute r race , shi m an d transmissio n
housing .
7 5 m m THRUS T SHIM :
Standard shi m 3
. Lubricat e th e tapere d rolle r bearin g wit h transmis -
sio n oil , the n instal l th e differential .
4 . Instal l th e transmissio n housing .
NOTE : D o no t instal l th e mainshaft , countershaft ,
an d revers e idl e gea r shaft .
Torque : 4 5 N- m (4. 5 kg-m , 3 3 Ib-ft )
5 . Rotat e th e differentia l assembl y i n bot h direction s
t o sea t th e bearings .
6. Measur e th e startin g torqu e o f th e differentia l
assembly wit h a specia l too l an d a torqu e wrenc h
a s shown .
NOTE : Measur e th e bearin g preloa d a t norma l
roo m temperatur e i n bot h directions .
Standard : 2.0-3. 0 N- m (20-3 0 kg-cm ,
17-26 lb-in )
TORQUE WRENC H
DIFFERENTIA LINSPECTION TOOL S07MAJ-PR90100
7. I f th e bearin g preloa d i s no t withi n th e standard ,
selec t th e shi m tha t wil l giv e yo u th e correc t
preload , an d recheck .
NOTE : Changin g on e o f th e shim s t o th e nex t siz e
wil l increas e o r decreas e preloa d abou t 0. 3- 0. 4
N- m (3- 4 kg-cm , 2.60-3.4 7 Ib-in) .
DRIVE R07749-0010000
ATTACHMENT ,72 x 75 m m07746-0010600
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Oil Sea l
Installatio n
1. Instal l th e oi l sea l int o th e transmissio n housin g
usin g th e specia l tool s a s shown .
DRIVER07749-0010000
BEARIN G
DRIVE R ATTACHMEN T
07965-SAO060 0
OIL SEA LReplace .
PILOT, 3 2 x 5 0 m m07MA D-PR9020 0
2. Instal l th e oi l sea l int o th e clutc h housin g usin g th e
specia l tool s a s shown.
DRIVE R07749-0010000
SEAL DRIVE RATTACHMEN T07947-SD90100 or07947-SD90101
OI L SEA L
Replace .
PILOT , 3 2 x 5 0 m m
07MA D-PR9020 0
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