1991 ACURA NSX air condition

Warning/Caution Label Locations

SRS CAUTION LABELS: Refer to page 1-8.
FROZEN

BATTERY CAUTION

BATTERY

CAUTION

RADIATOR BLEED

PLUG CAUTION
AIR CONDITIONING
R-134a CAUTION (U.S.A only)
EXPANSION
TANK CAP

CAUTION

ENGINE COOLANT CAUTION PRECAUTION

SPARK PLUG

CAUTION

TIRE INFORMATION
ABS CAUTION

ABS and BRAKE

FLUID CAUTION

RETRACTABLE

HEADLIGHT CAUTION

EMISSION CONTROL

INFORMATION and

VACUUM HOSE

ROUTING DIAGRAM

(cont'd)ProCarManuals.com

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

sec
and

PAGE
NO

19-6 19-8

19-18

19-26

19-4
19-10

19-69
19-41

19-43 19-44

19-62

18-7
17-21

('93-'96)
('94-'96)
17-60('94-'96)
('94-'96)


17-6

18-14

18-30

Under severe driving conditions, service these items more often.
Severe Driving Conditions
Items marked or in the chart indicate you will need some services more frequent-

ly in certain severe driving conditions.

The conditions are:
A: Driving loss than 5 miles (8 km) per trip, or, in freezing temperatures, driving less than 10 miles (16 km) per trip.
B: Driving, on rough or muddy roads, or de-iced roads.

C: Driving in extremely dusty conditions.
D: Extensive idling or driving long periods at slow speeds, such as a delivery vehicle. *6 : Ruler to Base Service Manual ('93 NSX, P/N 61SL002).
Services for Severe Driving Conditions
—
Clean
the air
cleaner
element
every
7,500 miles
(12,000
kml or 6
months
and
replace every
30,000
miles (48,000 km) or 24 months under condition B or C,

— Replace engine oil and oil filter every 3,750 miles (6,000 km) or\
3 months under conditions A, B, C, Dor E.
— Replace transmission oil every 15,000 miles (24,000 km) or 1 7. months under conditions D of E.

— Inspect front brake discs and calipers, and rear brake dises, calipers and pads every 7,500 miles (12,000

km) or 6 months under conditions B, C of D.
— Inspect the power steering system every 7,500 miles (12,000 km) or 6 months under conditions A, B or C.ProCarManuals.com

Warning/Caution Label Locations

SRS CAUTION LABELS: Refer to page 1-8.
FROZEN

BATTERY CAUTION

BATTERY

CAUTION

RADIATOR BLEED

PLUG CAUTION
AIR CONDITIONING R-134a CAUTION(U.S.A only)

EXPANSION

TANK CAP CAUTION
ENGINE COOLANT
CAUTION • PRECAUTION
SPARK PLUG
CAUTION

TIRE INFORMATION
EMISSION CONTROL

INFORMATION and

VACUUM HOSE

ROUTING DIAGRAM
RETRACTABLE

HEADLIGHT CAUTION
ABS and BRAKE

FLUID CAUTION ABS CAUTION

(cont'd)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

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

NOTE
SEC

and

PAGE

Service at the interval listed x 1,000 miles (or km) or after that number of months, whichever comes first.

19-6

19-8

19-18
Under severe driving conditions, service these items more often.
Severe Driving Conditions Items with an or in the chart will need service more often, if you drive in some
severe conditions.

The conditions are:

A: Repeated short distance driving.
B: Dusty conditions.

C: Severe cold weather. D: Areas with road salt or other corrosive materials.
E: Rough or muddy roads. 18-14
18-30
17-6
17-21

17-68
18-7
19-62

19-41
19-43
19-44 19-10
19-69 19-4
19-26

The services are:
Clean the air cleaner element every 7,500 miles (12,000 km) or 6 months and replace every 30,000 miles(48,000 km) or 24 months under condition B or E.
Replace engine oil and oil filter every 3,750 miles (6,000 km) or 3 months under condition A or B.
Inspect front brake discs and calipers, and rear brake discs, calipers and pads every 7,500 miles (12,000
km) or 6 months under condition A, B, D or E.
Inspect the power steering system every 7,500 miles (12,000 km) or 6 months under condition B, C or E.ProCarManuals.com

Engine Removal/Installation
(cont'd )


32. Remove the rear beam rod assembly.
33. Remove the front beam. Lower and suspend the air conditioning (A/C) compressor. Reinstall the frontbeam.

NOTE:

PARKING BRAKE CABLE

Hang with

wire or rope.

FRONT BEAM

REAR BEAM

ROD ASSEMBLY

Remove.

A/C COMPRESSOR

Do not remove the compressor hoses.
Hang the A/C compressor with wire
or rope as shown.
Do not let it hang from hoses.
Retorque the two nuts
NOTE:

Do not remove the compressor hoses.
Do not let the compressor hang from hoses.
34. Remove the left and right parking brake cables.
35. Disconnect the stabilizer bar end links from the knuckles, remove the bar. Separate the dampers
from the knuckles.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

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

14. Remove the connector, the terminal and the alternator.
1 5. Remove the bolt from the side engine mount, then
push the side mounting bracket into the housing of
the body (page 5-27).
16. Remove the transmission mount.
17. Remove the cylinder head covers.

18. Turn the crankshaft so that the No. 1 piston is at

top dead center (page 6-25, 26).

19.
Install
a
brace
under
the
engine, then
tilt
the
engine approximately 5° using a jack.
Timing Belt
Removal (cont'd)
BELT COVER
ALTERNATOR
20. Remove the alternator bracket stiffener.
ALTERNATOR BRACKET
STIFFENER

21. Remove the air conditioning (A/C) compressor ad-
justing pulley and belt.

22. Remove the dipstick pipe mounting bolt, then re- move the front and rear timing belt middle covers.
23. Remove the crankshaft pulley, then remove the tim- ing belt lower cover.
24. Loosen the timing belt adjusting bolt 180° and release the belt tension.
NOTE: Push the tensioner to release tension from
the belt, then retighten the adjusting bolt.
ADJUSTING BOLT
Do not remove. When

adjusting, loosen

it
180°.
25. Remove the timing belt from the pulleys.
CAUTION: Do not crimp or bend the timing belt more

than 90° or less than 25 mm (1 in.) in diameter.
DIAMETER

1.0 x
1.25
mm

45N .
m (4.5 kg-m,

33 Ib-ft)

6 x 1.0 mm

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

8x1.25 mm

22N .
m

(2.2 kg-m,
16 Ib-ft)
9 Ib-ft)
6 x 1.0 mm

12N .
m (1.2 kg-m.

6 Ib-ft29

ADJUSTING BOLT

8x1.25 mm

8N .
m (0.8 kg-m,

1.0 x
1.25
mm
8x1.25 mm

12N .
m (1.2 kg-m,

9 Ib-ft)ProCarManuals.com