oil level ACURA NSX 1991 Service Repair Manual

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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Camshafts
Installation
17. Appl y liqui d gaske t t o th e hea d cove r gaske t a t th e
eigh t corner s o f th e recesses .
NOTE:
• Us e liqui d gasket , Par t No . 0871 8-0001 .
• Chec k tha t th e matin g surface s ar e clea n an d dr y
befor e applyin g liqui d gasket .
• D o no t instal l th e part s i f fiv e minute s o r mor e
hav e elapse d sinc e applyin g liqui d gasket . Instead ,
reapply liqui d gaske t afte r removin g ol d residue .
• Afte r assembly , wai t a t leas t 2 0 minute s befor e
filling th e engin e wit h oil .
Appl y liqui d gaske t t oth e shade d areas .
18. Whe n installin g th e cylinde r hea d cover , hol d th e
hea d cove r gaske t i n th e groov e b y placin g you r fin -
ger s o n th e camshaf t contactin g surface s (to p o f th e
semicircles) .
Once th e cylinde r hea d cove r i s o n th e cylinde r
head , slid e th e cove r slightl y bac k an d fort h t o sea t
th e hea d cove r gasket .
NOTE:
• Befor e installin g th e cylinde r hea d cover , clea n
th e cylinde r hea d contactin g surface s wit h a
sho p towel .
• D o no t touc h th e part s wher e liqui d gaske t wa s
applied .
• Replac e th e washe r whe n damage d o r deterio -
rated .
WASHE R
CYLINDE RHEAD COVE R
6 x 1. 0 m m12 N- m (1. 2 kg-m ,9 Ib-ft )
19. Tighte n th e nut s i n tw o o r thre e steps . I n th e fina l step ,
tighte n al l nuts , i n sequence , t o 1 2 N- m (1. 2 kg-m ,
9 Ib-ft) .
NOTE : Afte r assembly , wai t a t leas t 2 0 minute s
before fillin g th e engin e wit h oil .
20. Afte r installation , chec k tha t al l tubes , hose s an d
connector s ar e installe d correctly .
NOTE: Afte r installation , fil l th e engin e wit h oi l u p to
th e specifie d level , ru n th e engin e fo r mor e tha n thre e
minutes , the n chec k fo r oi l leakage .
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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.ProCarManuals.com

Oil Pressur e
Testing
If th e oi l pressur e warnin g ligh t stay s o n wit h th e engin e
running , chec k th e engin e oi l level . I f th e oi l leve l i s
correct :
1 . Remov e th e engin e oi l pressur e switch , an d instal l
a n oi l pressur e gauge .
2. Star t th e engine . Shu t i t of f immediatel y i f th e
gaug e register s n o oi l pressure . Repai r th e proble m
befor e continuing .
3 . Allo w th e engin e t o reac h operatin g temperatur e
(fa n come s o n a t leas t twice) . Th e pressur e shoul d
be:
Engin e Oi l Pressure :
A t Idle : 7 0 kP a (0. 7 kg/cm2, 1 0 psi )
minimu m
At 3,00 0 rpm : 35 0 kP a (3. 5 kg/cm2, 5 0 psi )
minimu m
• I f oi l pressur e i s
within specifications , replac e th e
oi l pressur e sende r an d recheck .
• I f oi l pressur e i s NO T withi n specifications , inspec t
th e oi l pum p (se e pag e 8-8) .
ENGIN E OI L PRESSUR ESWITCHMOUNTIN G HOL E
OIL PRESSUR E GAUG E ADAPTO R
(1/8 " - 28 , BSPT )
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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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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

R-Replace I—Inspect After inspection, clean, adjust, repair or replace if necessary.
SEC
and
PAGE

11-129

11-102

11-151

6-54

11-114

11-4

23-96
8-4

8-5

23-109
10-2

10-5

6-21
10-10

11-144

9-4

9-4

13-3
14-90

For cars sold in California, this service is recommended only: other areas, it is required.

Replace every 6 years or 60,000 miles (96,000 km), whichever comes first.

Thereafter, replace
every
2
years
or
30,000
miles
(48,000
km), whichever comes first.
This service is recommended only.
Check oil and coolant level at each fuel stop.

Under severe driving conditions, service these items more often.ProCarManuals.com

Cylinder Head/Valve Train
Illustrated Index

CAUTION: To avoid damaging the cylinder head, wait

until the engine coolant temperature drops below
100 °F (38 °C) before removing it.NOTE:

CAP NUT

6 x 1.0 mm
10 N .
m
(1.0 kg-m,

7 Ib-ft)
CYLINDER

HEAD COVER

WASHER AND

GROMMET

After installation, fill the engine with oil up to the

specified level, run the engine for more than 3

minutes, then check for oil leakage.

When installing the new crankshaft;

tighten the crankshaft pulley bolt to 280 N .
m (28

kg-m, 203 Ib-ft),

loosen bolt.


retighten it to

250 N .
m (25 kg-m, 181 Ib-ft).

CYLINDER HEAD

COVER
RUBBER SEALS
Replace when damaged

or deteriorated.

6 x 1.0 mm
12N .
m (1.2 kg-m,

9 Ib-ft)

TIMING BELT
REAR MIDDLE

COVER

TIMING BELT
FRONT MIDDLE

COVER
ADJUSTING BOLT

10 x
1.25
mm

43N .
m (4.3 kg-m,

31 Ib-ft)

For adjustment only,
do not remove.

ALTERNATOR

BELT

Adjustment,
section 23

6 x 1.0 mm
12N .
m
(12
kg-m.

9 Ib-ft)

CRANKSHAFT PULLEY
Remove any oil.

SPECIAL BOLT
16x 1.5 mm

250N .
m (25 kg-m,

181 Ib-ft

Tightening torque for
a new crankshaft.

203

Apply oil to
the bolt threads, but not
to the surface that contacts the washer.
6 x 1.0 mm

12N .
m (1.2 kg-m,

9 Ib-ft)
AIR CONDITIONING (A/C) BELT
Adjustment, section 22
6x 1.0 mm

12N .
m (1.2 kg-m, 9 Ib-ft)

(cont'd)

A/C ADJUSTING

PULLEY BRACKET

RUBBER SEAL
Install with concave

surface facing out.

Remove any oil.
TIMING BELT

DRIVE PULLEY

Remove any oil.

Install with concave
surface facing in.
Remove any oil.

TIMING BELT

Inspection, page 6-22
Adjustment, page 6-22 Replacement, page 6-23 to 26
RUBBER SEALS

Replace when damaged
or deteriorated.
CAP NUT

6 x 1.0 mm

10N .
m (1.0 kg-m,

7 Ib-ft)

TIMING BELT

LOWER COVER

RUBBER SEAL
KEY

Remove any oil.

TENSIONER

280

250N.m

25
kg-m,
181 Ib-ft)

(28
0
0
0

Use new O-rings and gaskets when reassembling.

Replace rubber seals, if damaged or deteriorated.

Prior to installing the cylinder head cover, apply a thin

layer of liquid gasket to the mating surface of the

cylinder head cover and rubber seals to prevent the
rubber seal from falling off.ProCarManuals.com

Remove any oil.
TIMING BELT

Inspection, page 6-22

Adjustment, page 6-22

6 x 1.0 mm
12N .
m(1.2kg-m,9 Ib-ft)
Timing Belt
Illustrated Index
Turn the crankshaft so that the No. 1 piston is at top
dead center (TDC) (page 6-25, 26)
Replace rubber seals if damaged or deteriorated.
Prior to installing the cylinder head cover, apply a thin
layer of liquid gasket to the mating surface of the cylinder head cover and rubber seals to prevent the
rubber seal from falling of.
CYLINDER HEAD COVER
CAP NUT

6x 1.0 mm

10N .
m (1.0 kg-m, 7 Ib-ft)
CAP NUT

6 x 1.0 mm

10N .
m (1.0 kg-m,
7 Ib-ft)

WASHER

RUBBER SEALS
Replace when damaged

or deteriorated.

ADJUSTING BOLT
10 x
1.25
mm

43N .
m (4.3 kg-m,31 Ib-ft)

For adjustment only,

do not remove.
Remove any oil.

COLLARS

RUBBER SEALS

Replace when damaged
or deteriorated.

6 x 1.0 mm
12N .
m (1.2 kg-m.
9 Ib-ft)
6x1.0
mm
12N .
m (1.2 kg-m.
9 Ib-ft)

TIMING BELT
FRONT MIDDLE

COVER

CRANKSHAFT
PULLEY

Remove any oil.
6 x 1.0 mm

12N .
m (1.2 kg-m.

9 Ib-ft)

SPECIAL BOLT
16 x 1.5 mm

250N .
m (2.5 kg-m,

181 Ib-ft)

Tightening torque for
a new crankshaft.

Apply oil to the bolt threads,
but not to the surface

that contacts the washer.

280


0

250N.m

28

0

25
kg-m.

203

0

181 Ib-ft LOWER COVER

RUBBER SEAL
After installation, fill the engine with oil up to the

specified level, run the engine for more than 3
minutes, then check for oil leakage.
When installing a new crankshaft; i tighten the crankshaft pulley bolt to 280N.m (28
kg-m, 203 Ib-ft), loosen it, retighten it to 250
N.m (25 kg-m, 181 Ib-ft).ProCarManuals.com

Prior to installing the cylinder head cover, apply
a thin layer of liquid gasket to the mating surface
of the cylinder head cover and rubber seals to pre-
vent the rubber seal from falling off.
After
installation,
fill
the
engine
with
oil up to the

specified level, run the engine for more than 3 minutes, then check for oil leakage.
8. If the camshaft pulleys are not positioned at TDC,

remove the timing belt and adjust the positioning of

the pulleys, then reinstall the timing belt.

6. Temporarily install the lower cover and crankshaft

pulley.

7. Check the crankshaft pulley and the camshaft pulleys at TDC.
FRONT:
5.0 mm

PIN PUNCHES

MIDDLE COVER

REAR:

TDC MARK

5.0 mm

PIN PUNCHES
Direction
of rotation.
FRONT:

REAR:

TDC MARK

TDC MARK

(White paint)

TDC MARKS

COVER PLATE

TDC MARK

MIDDLE COVER TDC MARKS

Timing Belt
Installation (cont'd)


Refer to page 6-23, 24 for timing belt removal.
Bring the "UP" mark of the camshaft pulleys to
the top, and align the TDC marks on the pulleys.
Align the holes on the camshaft holder pipes to
the camshaft holes, insert 5.0 mm pin punches
and fix them at TDC.

Remove the pin punches after the timing belt has
been reinstalled.

NOTE:

NOTE:ProCarManuals.com