1997 ACURA NSX height

Camshafts

Inspection (cont'd)

9. Remove the camshaft holders and measure widest

portion of plastigage on each journal.

Camshaft-to-Holder Oil Clearance:

Standard (New): 0.050 - 0.089 mm

(0.002 - 0.004 in)

Service Limit: 0.15 mm (0.006 in)

PLASTIGAGE STRIP

10. If camshaft-to-holder oil clearance is out of toler-

ance:

— And camshaft has already been replaced, you

must replace the cylinder head.

— If camshaft has not been replaced, first check

total 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.
11. Check cam lobe height wear.

Cam Lobe Height Standard (New):

M/T

Check this area for wear.ProCarManuals.com

Cylinder Head s
Warpag e
NOTE: I f camshaft-to-holde r oi l clearance s (se e page s
6-35 , 6-36 ) ar e no t withi n specification , th e cylinde r hea d
canno t b e resurfaced .
I f camshaft-to-holde r oi l clearance s ar e withi n specifica -
tions , chec k th e cylinde r hea d fo r warpage .
• I f warpag e i s les s tha n 0.0 5 m m (0.00 2 in ) cylinde r
head resurfacin g i s no t required .
• I f warpag e i s betwee n 0.0 5 m m (0.00 2 in ) an d 0. 2
mm (0.00 8 in) , resurfac e cylinde r head .
• Maximu m resurfac e limi t i s 0. 2 m m (0.00 8 in ) base d
on a heigh t o f 1 51 m m (5.94 5 in) .
PRECISIO N STRAIGH T EDG E
Measur e alon g edges , an d thre e way s acros s center .
Cylinde r Hea d Height :
Standar d (New) : 150.9 5 - 151.0 5 m m
(5.94 3 - 5.94 7 in )
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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 6-41 ), replac e
the m (se e pag e 6-42 ) 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 ° stone .
Beve l th e lowe r edg e i t tw o angles .
Firs t grin d th e edg e wit h th e 60 ° stone , the n grin d
th e botto m edg e wit h th e 67.5 ° stone .
Chec k 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
5. Afte r 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 i n origina l locatio n i n th e head ,
the n lif t i t an d sna p i t 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 .
ProCarManuals.com

7. Appl y a thi n coa t o f clea n engin e oi l t o th e outsid e o f
th e ne w valv e guide . Instal l th e guid e fro m th e
camshaf t sid e o f th e head ; us e th e specia l too l t o
driv e th e guid e i n t o th e specifie d installe d height . I f
yo u hav e al l 1 2 guide s t o do , yo u ma y hav e t o rehea t
th e head .
VALV E GUID EDRIVER , 5. 5 m m07742-001010 0
Valve Guid e Installe d Height :
Intake: 13.75-14.2 5 m m (0.541-0.56 1 in )
Exhaust : 13.75-14.2 5 m m (0.541-0.56 1 in )
ProCarManuals.com

Thermostat
Replacemen t
NOTE: Us e ne w gasket s an d O-ring s whe n reassem -
bling.
COOLAN TTEMPERATUR E GAUG ESENDIN G UNI T
9 N- m (0. 9 kgf-m , 7 Ibf-ft )
Appl y liqui d gaske t
t o th e threads .
WATE R PASSAG E
BLEED BOL T9.8 N- m (1. 0 kgf-m , 7. 2 Ibf-ft )
8 x 1.2 5 mm22 N- m (2. 2 kgf-m ,16 Ibf-ft )
RADIATO R FA N
CONTRO L SENSO R
2 7 N- m (2. 8 kgf-m ,
20 Ibf-ft )
6 x 1. 0 m m12 N- m (1. 2 kgf-m ,8.7 Ibf-ft )
THERMOSTAT
Install wit h pi n up .
THERM O COVE R
8 x 1.2 5 mm22 N- m (2. 2 kgf-m , 1 6 Ibf-ft )
O-RIN G 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
O-RINGSReplace .
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17. Install new boot bands on the boots, then bend both

sets of locking tabs.

1 8. 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 differ-

ential side gear groove, and the inboard joint

subaxle bottoms in the differential.

• Insert the right driveshaft inboard joint subaxle

into the intermediate shaft until the intermedi-

ate shaft set ring locks in the groove in the right

driveshaft.

Apply light film of

grease before installing.

INBOARD JOINT

SET RING
SET RING GROOVE

Left Driveshaft

inboard end
Right Driveshaft

inboard end

(Intermediate shaft side)
LOCKING TABSProCarManuals.com

System Description

Steering Column

The NSX/NSX-T has a tilt/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.ProCarManuals.com

Steering Gearbo x
Inspectio n (cont'd )
7. Instal l th e boot s o n th e rac k en d wit h th e tub e clamps .
NOTE:
• Coa t th e rac k en d an d insid e o f th e boo t wit h th e
grease .
• Befor e installin g th e boot , b e sur e tha t th e pres -
sur e insid e of the boo t i s th e atmospheri c pres -
sure.
• Instal l th e boo t ban d wit h th e rac k i n th e straigh t
ahea d conditio n (righ t an d lef t tie-rod s ar e equa l
i n length) . 9
. I f th e tie-ro d end s wer e removed , instal l th e tie-rod s
o n th e righ t an d lef t rac k end s an d scre w the m in
until the threade d sectio n i s 1 1 m m (7/1 6 in ) i n
length .
10. Instal l th e gearbo x an d th e fron t crossbea m in th e
revers e orde r remova l (se e pag e 17-57 ).
11 . Chec k th e whee l alignmen t an d adjus t i f necessar y
(se e sectio n 18 ).
8 . Instal l th e ne w boo t band s o n th e boot , an d ben d
bot h set s o f lockin g tabs . Lightl y ta p o n th e double d
portion s t o reduc e thei r height .
NOTE : Afte r assembling , slid e th e rac k righ t an d
lef t t o b e certai n tha t th e boot s ar e no t deforme d o r
twisted .
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