1991 ACURA NSX oil change

Maintenance
Transmissio n Oi l
NOTE : Chec k th e oi l a t norma l operatin g temperatur e
(the coolin g fa n come s on) , engin e OFF , an d th e ca r o n
leve l ground .
1 . Remov e th e oi l fille r plug , the n chec k th e leve l an d
conditio n o f th e oil .
WASHE RReplace .Proper Leve l
OIL FILLE R PLU G45 N- m (4. 5 kg-m . 3 3 Ib-ft )
2. Th e oi l leve l mus t b e u p to th e fil l hole . I f i t i s belo w
the hole , ad d oi l unti l i t run s out , the n reinstal l th e
oil fille r plug .
3 . I f th e transmissio n oi l i s dirty , remov e th e drai n plu g
an d drai n th e oil .
4 . Reinstal l th e drai n plu g wit h a ne w washer , an d
refil l th e transmissio n oi l t o th e prope r level .
5. Reinstal l th e oi l fille r plu g wit h a ne w washer .
NOTE: Th e drai n plu g washe r shoul d b e replace d
a t ever y oi l change .
Oi l Capacit y
2. 7 ( 2.9 U S qt , 2. 4 Im p qt ) a t oi l change .
2.8 (3. 0 U S qt , 2. 5 Im p qt ) a t overhaul .
Alway s us e genuin e Hond a manua l transmissio n flui d
(MTF) . I f i t i s no t available , yo u ma y us e a n AP I
servic e S G o r S H grad e moto r oi l wit h a viscosit y o f
SA E 10W-3 0 o r 10W-4 0 a s a temporar y replacement .
Moto r oi l ca n caus e increase d transmissio n wea r an d
highe r shiftin g effort , s o yo u shoul d hav e th e trans -
missio n draine d an d refille d wit h Hond a MT F a s soo n
as possible . OIL FILLE R PLU G
45 N- m (4. 5 kg-m . 3 3 Ib-ft )WASHE R Replace .
DRAIN PLU G40 N- m (4. 0 kg-m , 2 9 Ib-ft )WASHE R Replac e
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Valves, Valv e Spring s an d Valv e Seal s
Installatio n Sequenc e
NOTE: Exhaust and intake valve seals are NOT interchangeable.
INTAKE VALV E SPRIN G
VALVE KEEPER S
VALV E SPRIN G
RETAINE R
VALVE SPRIN G
EXHAUS T VALV E SEA L
(BLAC K SPRING )
Replace.
NOTE: Plac e th e en d o f valv espring wit h closel y woun d coil stowar d th e cylinde r head .
INTAK E VALV E SEA L
(WHIT E SPRING )
Replace .
SPRING SEA T
NOTE : Instal l th e valv e sprin g seat sbefor e installin g th e valv e seals .
VALV E SEA L INSTALLE R
(Commerciall y available )KD-2899
VALVE SEA L
Replace .
OUTER
SPRIN G
INNE R
SPRIN G
(M/ T only )
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Maintenance
Transmissio n Oi l
NOTE : Chec k th e oi l a t norma l operatin g temperatur e
(th e coolin g fa n come s on) , engin e OFF , an d th e ca r o n
leve l ground .
1 . Remov e th e oi l fille r plug , the n chec k th e leve l an d
conditio n o f th e oil .
WASHE R
Replace . Prope
r Level .
OI L FILLE R PLU G
4 5 N- m (4. 5 kg-m , 3 3 Ib-ft )
2. Th e oi l leve l mus t b e u p t o th e fill hole . I f i t i s belo w
th e hole , ad d oi l unti l i t run s out , the n reinstal l th e
oi l fille r plug .
3 . I f th e transmissio n oi l i s dirty , remov e th e drai n plu g
an d drai n th e oil .
4. Reinstal l th e drai n plu g wit h a ne w washer , an d
refil l th e transmissio n oi l t o th e prope r level .
5 . Reinstal l th e oi l fille r plu g wit h a ne w washer .
NOTE : Th e drai n plu g washe r shoul d b e replace d
a t ever y oi l change .
Oi l Capacity
2. 7 (2. 9 U S qt , 2. 4 Im p qt ) a t oi l change .
2.8 (3. 0 U S qt , 2. 5 Im p qt ) a t overhaul .
Use onl y SAE10W-3 0 or 10W-40 , API Servic e SF
or S G grade .
DRAIN PLU G
4 0 N- m (4. 0 kg-m , 2 9 Ib-ft )
WASHE R Replace .
Back-up Ligh t Switch ,
Neutral Positio n Switc h
Replacemen t
NOTE: T o chec k th e switch , se e sectio n 23 .
1 . Disconnec t th e connector , the n remov e th e switc h
connecto r fro m th e connecto r clamp .
2 . Remov e th e switch .
3. Appl y liqui d gaske t (P/ N 08718-0001 ) t o th e
switc h threads , the n instal l th e switch .
BACK-U P LIGH T SWITC H
2 5 N- m (2. 5 kg-m , 1 8 Ib-ft )
NEUTRA L POSITIO N SWITC H
2 5 N- m (2. 5 kg-m , 1 8 Ib-ft )
OI
L FILLE R PLU G
4 5 N- m (4. 5 kg-m , 3 3 Ib-ft )
WASHE R Replace .
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System Description

Function and Operation

Steering Sensor

The steering sensor consists of a torque sensor, an

interface, and the rotation sensor.

Torque Sensor

The torque sensor converts steering torque input and its

direction to voltage signals, in conjunction with the

interface.

A torsional force caused by steering operation is con-

verted to an axial movement of a slider core. A variable

differential transformer is installed around the slider

core.

Within the transformer are three coils, a primary coil on

the inside, and two secondary coils, one for right turns

and one for left turns.

Alternating current is passed through the primary coil

when the system is energized. The amount of mutual

induction from the primary coil to the secondary coils

changes depending on the position of the slider coil.

The input shaft and the slider are one piece. Rotation of

the shaft moves the slider in a circular direction. The

pinion is turned via the torsion bar. The slider core is

installed on the pinion shaft on grooves, and turns with

the pinion shaft.

When there is little resistance, the input shaft torsion

bar, pinion shaft, and the slider core turn together to the

same angle. The slider core does not move up/down.
TORSION BAR

INPUT

SHAFT

INTERFACE

CIRCUIT

SPIRAL

GROOVE

ROTATION

SENSOR

GUIDE

PIN

TRANSFORMER

PINION GEAR

WING

When there is resistance on the input shaft (hard to steer situation), and the slider pin is turned at an angle by the steering

wheel, the torsion bar is twisted due to the resistance. Accordingly, the pinion shaft turns at a smaller angle. The differ-

ence in the turning angles changes the position of the slider pin in the groove, forcing the slider core upward or down-

ward, depending on the direction of the direction of the turn.

PRIMARY COIL

UPPER SECONDARY COIL

LOWER SECONDARY COIL

SLIDER
SLIDERProCarManuals.com

Clutch Inspectio n
• Chec k th e plate d part s o f th e pressur e plat e fo r colo r
changes , peelin g o r othe r damage . I f ther e i s dam -
age , replac e th e clutc h set .
, • Chec k th e pulle y bearin g pla y an d dra g b y rotatin g
th e pulle y b y hand . Replac e th e clutc h se t wit h a ne w
on e if i t i s nois y o r ha s excessiv e play/drag .
PULLEY
Measur e th e clearanc e betwee n th e pulle y an d th e
pressur e plat e al l th e wa y around . I f th e clearanc e i s
no t withi n specifie d limits , th e pressur e plat e mus t b e
remove d an d shim s adde d o r remove d a s required ,
followin g th e procedur e o n pag e 22-40 .
Clearance : 0. 5 ± 0.1 5 m m (0.02 0 ± 0.00 6 in )
NOTE : Th e shim s ar e availabl e i n thre e thicknesses :
0.1 mm , 0. 3 m m an d 0. 5 mm .
Chec k resistanc e o f th e fiel d coil .
Fiel d Coi l Resistance : 3. 6 ± 0. 2 ohm s a t 6 8 F (2 0 C )
I f resistanc e i s no t withi n specifications , replac e th e
fiel d coil .
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Engine Oil

Replacement

CAUTION: Remove the drain plug carefully while the en-

gine is hot, the hot oil may cause scalding.

1. Warm up the engine.

2. Drain the engine oil.

WASHER

Replace.

DRAIN PLUG

45 IM-m (4.5 kg-m, 33 Ib-ft)

3. Reinstall the drain plug with a new washer, and refill

with the recommended oil.

CAUTION: Do not overtighten the drain plug.

Requirement
API Service Grade: Use "Energy

Conserving II" SG or SH grade oil.

SAE
10W-30
preferred.

You can also an oil a cantainer that

bears API CERTIFICATION mark.

Capacity
5.0
(5.3
US qt, 4.4 Imp qt)

at change, including filter.

6.3
(6.7
US qt, 5.5 Imp qt)

after engine overhaul.

Change
Every 7,500 miles (12,000 km) or

6 months whichever comes first.
API CERTIFICATION MARK

The numbers in the middle of the API Service label tell

you the oil's SAE viscosity or weight. Select the oil for

your car according to this chart:

Ambient Temperature

An oil with a viscosity of 10W —30 is preferred for im-

proved fuel economy and year-round protection in the

car.

You may use a 5W —30 oil if the climate in your area is

limited to the temperature range shown on the chart.

4. Fill the engine with oil up to the specified level, run

the engine for more than 3 minutes, then check for

oil leakage and oil level.ProCarManuals.com

Valves, Valve Springs and Valve Seals

Valve Spring and Valve Seal Installation Sequence

NOTE: Exhaust and intake valve seals are NOT interchangeable.

INTAKE VALVE SPRING

NOTE: Place the end of valve

spring with closely wound coils

toward the cylinder head.

INTAKE VALVE SEAL

(WHITE SPRING)

Replace.

VALVE SEAL INSTALLER

KD-2899

VALVE SEAL

Replace.
VALVE KEEPERS

VALVE SPRING

RETAINER

VALVE SPRING

EXHAUST VALVE SEAL

(BLACK SPRING)

Replace.

SPRING SEAT

NOTE: Install the valve spring seats

before installing the valve seals.ProCarManuals.com

Engine Oil
Inspection
1. Check engine oil with the engine off and the car parked on level ground.
2. Make certain that the oil level indicated on the dipstick is between the upper and lower marks.
3. If the level has dropped close to the lower mark, add oil until it reaches the upper mark.
CAUTION: Insert the dipstick carefully to avoid
bending it. Replacement
CAUTION: Remove the drain plug carefully while the
engine is hot, the hot oil may cause scalding.
1. Warm up the engine.
2. Drain the engine oil.

WASHER
Replace.

OIL PAN DRAIN PLUG

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

3. Reinstall the drain plug with a new washer, and
refill with the recommended oil.

CAUTION: Do not overtighten the drain plug.
Requirement

Capacity

Change API Service Grade: Use "Energy
Conserving II" SG grade oil,
10 W–30 prefered

5.0

Every 7,500 miles (12,000 km)

NOTE: Oil filter should be replaced at each oil
change.
Engine Oil Viscosity for Outside Temperature Ranges.

(5.3
US qt, 4.4 Imp qt)

for change, including filter.

6.3

(6.7
US qt, 5.5 Imp qt)

for engine overhaul.ProCarManuals.com