height ACURA NSX 1991 Service Repair Manual

Lift an d Suppor t Point s
Lift an d Safet y Stand s
CAUTION :
• I f groun d clearanc e i s inadequat e t o clea r th e sho p lift , either :
— Instal l rubbe r spacer s o n th e coi l spring s t o rais e th e car . Us e th e floo r jac k procedure s t o rais e th e ca r (pag e 1-10 ).
o r
— Remov e th e chi n spoiler .
or
— If yo u nee d eve n mor e clearance , instal l th e rubbe r spacer s an d remov e th e chi n spoiler .
• Follo w th e lif t manufacturer' s instructions .
• Us e rubbe r pa d adapter s o n th e lif t t o avoi d damagin g th e car .
Space r Installatio n
1 . Plac e th e rubbe r contac t pad s a s shown .
2 . Rais e th e lif t a fe w inches , an d roc k th e ca r t o b e sur e i t i s firml y supported .
3. Rais e the lift to ful l height , and inspec t the lift point s for soli d support .
4. Instal l rubbe r spacer s o n th e coi l springs .
NOTE : Us e th e sam e suppor t point s t o suppor t th e ca r o n safet y stands .
CAUTION : Remov e th e rubbe r spacer s afte r lowerin g th e car . D o no t driv e th e ca r wit h rubbe r spacer s installe d be -
twee n th e spring .
COIL SPRIN G
COIL SPRIN G
RUBBE RSPACE R
FRONT SUPPOR TPOINTLIFT CONTAC T PAD SREAR SUPPOR TPOINT
RUBBE R SPACER SRUBBER SPACER S
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Lift an d Suppor t Point s
Lift
CAUTION :
I f groun d clearanc e i s inadequat e t o clea r th e sho p lift , either :
— Instal l rubbe r spacer s o n th e coi l spring s t o rais e th e car . Us e th e floo r jac k procedure s t o rais e th e ca r (pag e 1-10 ).
o r
— Remov e th e chi n spoiler .
or
— If yo u nee d eve n mor e clearance , instal l th e rubbe r spacer s an d remov e th e chi n spoiler .
Follo w th e lif t manufacturer' s instructions .
Us e rubbe r pa d adapter s o n th e lif t t o avoi d damagin g th e car .
Space r Installatio n
1. Plac e th e rubbe r contac t pad s a s shown .
2. Rais e th e lif t a fe w inches, and roc k th e ca r t o b e sur e i t i s firml y supported .
3. Rais e th e lif t t o ful l height , an d inspec t th e lif t point s fo r soli d support .
4. Instal l rubbe r spacer s o n th e coi l springs .
CAUTION : Remov e th e rubbe r spacer s afte r lowerin g th e car . D o no t driv e th e ca r wit h rubbe r spacer s installe d be -
twee n th e spring .
COIL SPRIN G
COIL SPRIN G
RUBBE RSPACER
FRONT SUPPOR TPOINTLIFT CONTAC T PAD SREAR SUPPOR TPOINT
RUBBE R SPACER SRUBBER SPACER S
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9. Relieve fuel pressure by loosening the service bolt
on the fuel filter about one turn (see section 11).
Do not smoke while working on the
fuel
system.
Keep open flame away from work
area. Drain fuel only into an approved container.
10. Remove the fuel feed pipe and fuel return hose.
11. Remove the wire harness cover, then remove the fuel pipe clamp.

22 N·m
(2.2 kg-m,
16 Ib-ft)

WIRE HARNESS

COVER
6 x 1.0 mm

12 N·m
(1.2 kg-m,

9 lb-ft)

FUEL FEED
PIPE

WASHERS
Replace.

FUEL RETURN

HOSE

12. Remove the brake booster vacuum hose and evapo- rative emission (EVAP) control canister hose.

BRAKE BOOSTER

VACUUM HOSE

EVAP CONTROL

CANISTER HOSE
13. Remove the expansion tank cap.

14. Raise the hoist to full height.
15. Drain the engine coolant (see page
10-5).
Loosen the drain plug from the radiator lower
tank. Remove two drain bolls from the water pipes.
Reinstall the drain bolts with new washers.
Loosen the front and rear engine drain bolts to
drain engine coolant from the cylinder heads.
Connect rubber hoses to the drain bolts.
16. Drain the transmission oil/fluid. Reinstall the drain plug with a new washer.
17. Drain the engine oil. Reinstall the drain plug with a
new washer.

18. Lower the hoist, then remove the air cleaner hous-

ing (see page 6-25 ('91-'93 Mode ls),or('95-'96 Models).

19. Disconnect two hoses, then remove the expansion

tank.

6 x 1.0 mm

10 N·m
11.0 kg-m,

7 lb-ft)

EXPANSION

TANK

WATER BYPASS

HOSES
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25. Loose n th e idle r pulle y cente r nu t an d adjustin g nut ,
the n remov e th e ai r conditionin g (A/C ) compresso r
belt.
ADJUSTIN GNUT
A/C COMPRESSO RBELT
IDLE R PULLE Y
CENTE R NU T
45 N- m (4. 5 kg-m ,33 Ib-ft )
26. Mov e th e trun k carpet , an d disconnec t th e righ t rea r
whee l senso r connector . Pus h th e wir e an d connec -
tor throug h th e bod y hol e int o th e engin e compart -
ment.
RIGH T REA R SENSO R
CONNECTO R
27. Rais e th e hois t t o ful l height .
28 . Remov e th e slav e cylinde r (M/ T se e sectio n 12 ).
• D o no t disconnec t th e clutc h hose .
29 . Remov e th e lowe r cover , the n remov e th e shif t
cabl e an d selec t cabl e (M/ T se e sectio n 13 ).
30 . Remov e th e cabl e cover , the n remov e th e shif t
cabl e (A/T) .
NOTE :
• Tak e car e no t t o ben d th e cabl e whe n removin g
it . Alway s replac e a kinke d cabl e wit h a ne w one .
• Adjus t th e cabl e whe n installing .
31 . Remov e th e engin e unde r guar d an d th e cente r ro d
assembly .
A/T:
CONTRO L LEVE R
CENTE R RO D
ASSEMBL Y
8 x 1.2 5 mm22 N- m (2. 2 kg-m ,16 Ib-ft )
6 x 1. 0 m m8 N- m (0. 8 kg-m , 6 Ib-ft )
6 x 1. 0 m m12 N- m (1. 2 kg-m , 9 Ib-ft )
UNDE R GUAR D
10 x 1.2 5 mm60 N- m (6. 0 kg-m , 4 3 Ib-ft )
SHIF
T CABL E
CABLE COVE R
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7. If camshaft-to-holder oil clearance is out of

tolerance:

— And camshaft has already been replaced, you

must replace the cylinder head.

— If camshaft has not been replaced, first check to-

tal runout with the camshaft supported on V-

blocks.

Camshaft Total Runout:

Standard (New): 0.03 mm (0.0012 in) max.

Service Limit: 0.04 mm (0.0016 in)

Rotate camshaft

while measuring

— If the total runout of the camshaft is within toler-

ance, replace the cylinder head.

— If the total runout is out of tolerance, replace the

camshaft and recheck. If the oil clearance is still

out of tolerance, replace the cylinder head.

8. Check cam lobe height wear.

Cam Lobe Height Standard (New):

M/T

A/T
Check this area for wear.

Cam position

P: Primary M: Mid S: Secondary

FRONT BANK

REAR BANK
CYLINDER

NUMBER

EXHAUST

INTAKE

CYLINDER

NUMBER

INTAKE

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Valve Seat s
Reconditionin g
1. Rene w th e valv e seat s i n th e cylinde r hea d usin g a
valv e sea t grinder .
NOTE : I f guide s ar e wor n (se e pag e 6-39 ), replac e
the m (se e pag e 6-40 ) befor e grindin g th e valv e seats .
2 . Carefull y grin d a 45 ° seat , removin g onl y enoug h
materia l t o ensur e a smoot h an d concentri c seat .
3 . Beve l th e uppe r edg e o f th e sea t wit h th e 30 ° ston e
and th e lowe r edg e of the sea t wit h th e 60 ° stone .
Check widt h o f sea t an d adjus t accordingly .
4 . Mak e on e mor e ver y ligh t pas s wit h th e 45 ° ston e
t o remov e an y possibl e burr s cause d b y th e othe r
stones .
Valv e Sea t Width :
Standar d (New) :
Intak e 0.8 0 - 1.0 0 m m (0.03 1 - 0.03 9 in )
Exhaus t 1.2 5 - 1.5 5 m m (0.04 9 - 0.06 1 in )
Servic e Limit :
Intak e 1. 5 m m (0.05 9 in )
Exhaus t 2. 0 m m (0.07 9 in )
SEA T WIDT H
After resurfacin g th e seat , inspec t fo r eve n valv e
seating : Appl y Prussia n Blu e compoun d t o th e valv e
face , an d inser t valv e in origina l locatio n in th e head ,
the n lif t i t an d sna p it close d agains t th e sea t sever -
a l times .
ACTUA L
SEATIN G
SURFAC E
VALVESEAT
PRUSSIA N BLU E COMPOUN D
6. Th e actua l valv e seatin g surface , a s show n b y th e
blu e compound , shoul d b e centere d o n th e seat .
• I f i t i s to o hig h (close r t o th e valv e stem) , yo u
mus t mak e a secon d cu t wit h th e 60 ° ston e t o
mov e it down , the n on e mor e cu t wit h th e 45 °
ston e t o restor e sea t width .
• I f i t i s to o lo w (close r t o th e valv e edge) , yo u mus t
make a secon d cu t wit h th e 30 ° ston e t o mov e
it up , the n on e mor e cu t wit h th e 45 ° ston e t o
restor e sea t width .
NOTE : Th e fina l cu t shoul d alway s b e mad e wit h
th e 45 ° stone .
7 . Inser t intak e an d exhaus t valve s i n th e hea d an d
measur e valv e ste m installe d height .
Valv e Ste m Installe d Heigh t (Intak e an d Exhaust) :
Standard (New) : 41.55-42.3 5 m m
(1.6358-1.667 3 in )
Servic e Limit : 42.43 5 m m (1.670 7 in )
VALV E STE M
INSTALLE D HEIGH T
8. I f valv e ste m installe d heigh t i s ove r th e servic e limit ,
replac e th e valv e an d recheck . I f stil l ove r th e servic e
limit , replac e th e cylinde r head ; th e valv e sea t i n th e
hea d is to o deep .
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Thermostat
Replacemen t
NOTE: Us e ne w gasket s an d O-ring s whe n reassem -
bling.
ENGIN E COOLAN T
TEMPERATUR E (ECT ) GAUG E
SENDIN G UNI T
9 N- m (0. 9 kg-m , 7 Ib-ft )
Apply liqui d gaske tto th e threads .
WATE R PASSAG E
8 x 1.2 5 mm22 N- m (2. 2 kg-m ,16 Ib-ft )BLEE D BOL T
1 0 N- m (1. 0 kg-m , 7 Ib-ft )
6 x 1. 0 m m12 N- m (1. 2 kg-m ,9 Ib-ft )
ECT SWITC H18 N- m (1. 8 kg-m ,13 Ib-ft )
8 x 1.2 5 mm22 N- m (2. 2 kg-m , 1 6 Ib-ft )
THERM O COVE R
O-RING Replace .
Testing
Replac e thermosta t i f i t i s ope n a t roo m temperature .
T o tes t a close d thermostat :
1 . Suspen d th e thermosta t i n a containe r o f wate r a s
shown .
2. Hea t th e water , an d chec k th e temperatur e wit h a
thermometer . Chec k th e temperatur e a t whic h th e
thermosta t firs t open s an d a t ful l lift .
CAUTION : D o no t le t thermomete r touc h th e botto m
o f th e ho t container .
3 . Measur e lif t heigh t o f th e thermosta t whe n full y open .
STANDAR D THERMOSTA T
Lif t height : abov e 1 0 m m (0.3 9 in )
Start s opening : 169-176° F (76-80°C )
Fully open : 194° F (90°C )
THERMOMETE R
THERMOSTA T
THERMOSTA
T
Install wit h pi n up .
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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
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17. Install new boot bands on the boots, then bend both

sets of locking tabs.

18. Lightly tap on the doubled-over portions to reduce

their height.

NOTE: Install the outboard joint in the knuckle

before installing the driveshaft into the differential

or intermediate shaft. Loosely install the spindle

nut this time.
19. Install the new set rings in the driveshaft groove

and intermediate shaft groove.

20. Apply a light film of grease around the set ring groove

on the inboard joint, then install a new set ring and

center it on the joint. The grease will keep the set

ring centered, making the installation of the joint

easier.

21. Install the inboard end of the driveshaft into dif-

ferential or intermediate shaft.

CAUTION:

• Always use a new set ring whenever the drive-

shaft is being installed.

• Make sure the left driveshaft locks in the dif-

ferential side gear groove, and the CV joint

subaxle bottoms in the differential.

• Insert the right driveshaft CV joint subaxle into

the intermediate shaft until the intermediate

shaft set ring locks in the groove in the right

driveshaft.

Apply light film of

grease before installing.

INBOARD JOINT

SET RING

Replace.
SET RING GROOVE

Left Driveshaft

inboard end
Right Driveshaft

inboard end

(Intermediate shaft side)
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System Description

Steering Column

The NSX/NSX-T has a till/telescopic steering column. The tilt/telescopic mechanism makes it possible to adjust the steer-

ing wheel in fore and aft, and up and down directions.

Tilt Mechanism

In the upper portion of the steering column is a joint on the steering shaft. This joint allows the steering wheel to be

adjusted
up or
down.
When
the
tilt
lever
is
operated,
the
lock
gears
are
detached from
the
column gear
to
release
the
lock.

The column moves upward or downward on two pivot bolts. When the tilt lever is returned to a fixed position after select-

ing the steering wheel height, the lock gear is engaged with the column gear to secure the column.

TILT LEVER

PIVOT

BOLT
COLUMN

GEAR

TILT LEVER

LOCK GEAR
JOINT

PIVOT

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