1991 ACURA NSX Service Repair Manual

Follow the Normal Conditions Maintenance Schedule if the severe driving conditions specified in the Severe Conditions Maintenance Schedule on pages 4-6 and 4-7 do not apply.

SECTION
and

PAGE
8-4. 8-5 ('91-92),('92), or ('94-'96)
8-4, 10-5 ('91-92),('92), or ('94-'96)

11-149

6-9 ('91-'93), or

('94-'96)

23-96 ('91) or
('92-'96)

6-15, 10-11
23-109

11-13
8('91-'92),
('93),or ('94-'96)

11-128

11-166
10-6
13-3

14-105 ('91-'92),('93),or ('94-'96)

19-6, 19-9
19-17, 19-19
19-10

19-69 ('91-'92), or

('93-'96)

19-4

*1: Measured between the rocker arm and camshaft.
*2: Do not adjust the gap, replace the spark plug if it is out of spec.ProCarManuals.com

SECTION

and

PAGE

19-26

10-6, 12-5

13-3, 14-105
('91-'93), or('94-'96),19-69('91-'92) or ('93-'96)

17-59

16-3
10-2

9-5

11-130 ('91-'92),('93), or ('94-'96)

According to state and federal regulations, failure to perform maintenance on the items marked with an asterisk (*) will not void customer's emission
warranties. However, Acura recommends that all maintenance services be performed at the recommended time or mileage period to ensure long-term reliability.
For Canadian models:
This Maintenance Schedule outlines the minimum required maintenance that you should perform to ensure the trouble-free operation of Canadian model. Due to regional and climatic differences, some additional servicing may be required.ProCarManuals.com

Follow the Severe Conditions Maintenance Schedule if the car is driven MAINLY under one or more of the Severe Driving Conditions (pages 4-7:)

SECTION
and

PAGE

8-4 ('91-'92),

('93), or ('94-'96),
8-5
8-4 ('91-92),
('93), or ('94-'96),
10-5

11-149
11-149

6-9('94-'96), or ('91-'93)
23-96
6-15('94-'96), or ('91-'93),10-11
23-109
11-138 ('91-92), ('93), or ('94-'96)

11-128 ('91-'92),

('93), or ('94-'96)

11-166
10-6

13-3
14-105 ('91-'92),
('93), or ('94-'96)
19-6, 9 17, 19
19-10
19-69 ('91-'92), or ('93-'96)
19-4

*1: Measured between the rocker arm and camshaft.
*2: Do not adjust the gap, replace the spark plug if it is out of spec.ProCarManuals.com

SECTION

and

PAGE

17-59 ('91-'93),
or ('94-'96)

16-3

19-26

10-6, 12-5
13-3, 14-105

('91-'93), or ('94-'96), 19-69

('91-'92),or ('93-'96)

10-2

9-5

11-130 ('91-'92)('93), or ('94-'96)

According to state and federal regulations, failure to perform maintenance on the items marked with an asterisk (*) will not void customer's emission
warranties. However, Acura recommends that all maintenance services be performed at the recommended time or mileage period to ensure long-term reliability.
Severe Driving Conditions: Driving less than 5 miles (8 km) per trip or, in freezing temperatures, driving less than 10 miles (16 km) per trip.
Driving in extremely hot [over 90°F (32°C)] conditions.
Extensive idling or long periods of stop-and-go driving.
Trailer towing, driving with a car-top carrier, or driving in mountainous conditions.
Driving on muddy, dusty, or de-iced roads.
NOTE: If the car is driven OCCASIONALLY under a "severe" condition, you should follow the Normal Conditions Maintenance Schedule on pages 4-4 and 4-5.ProCarManuals.com

Special Tools
Ref.
No.

Tool Number
07MAK – PR7020A

07MAZ – SL0000A

Description

Engine Removal/Installation Fixture
NSX Fender Cover
Qty

1
1
Page Reference

5-9 ('91-'93 Models),or
('94-'96 Models)
5-3 ('91-'93 Models)
,or ('94-'96 Models)
ProCarManuals.com

Engine Removal/Installatio n
Removal
Make sur e jack s an d safet y stand s ar e place d properl y
an d hois t bracket s ar e attache d t o th e correc t posi -
tion s o n th e engin e (se e sectio n 1 ).
• Mak e sur e th e ca r wil l no t rol l of f stand s an d fal l
whil e yo u ar e workin g unde r it .
CAUTION :
• Us e a fende r cove r (specia l tool ) t o avoi d damagin g
painte d surfaces .
• Unspecifie d item s ar e common .
• Unplu g th e wirin g connector s carefull y whil e holdin g
th e connecto r portio n t o avoi d damage .
• Mar k al l wirin g an d hose s t o avoi d misconnection .
Also , b e sur e tha t the y d o no t contac t othe r wirin g o r
hose s o r interfer e wit h othe r parts .
• I f th e groun d clearanc e need s t o b e increased , us e a
scissor s jac k an d instal l rubbe r spacer s i n th e coi l
spring s (se e sectio n 1 ).
• Pu t rubbe r pad s unde r th e jackin g point s whe n usin g
jack s o r safet y stand s t o avoi d damagin g th e bod y
(se e sectio n 1 ).
1 . Mov e th e sea t bottom s an d back s a s fa r forwar d a s
the y wil l go .
2. Remov e th e rea r hatc h assembl y an d engine cover
(se e sectio n 20 ).
3 . Disconnec t th e batter y negativ e termina l first , the n
the positiv e terminal . 4
. Remov e th e stru t brace .
COUPE :
STRUT BRAC E8 x 1.2 5 mm22 N- m (2. 2 kg-m ,16 Ib-ft )
NS X FENDE R
COVER07MAZ - SLOOOO A
NSX-T (ope n top) :
8 x 1.2 5 mm22 N- m (2. 2 kg-m , 1 6 Ib-ft )STRU T BRAC E
NSX FENDE R COVE R07MAZ-SLOOOO A
CORROSIO N RESISTAN T BOL T
ProCarManuals.com

Engine Removal/Installatio n
Removal
5. Disconnec t th e fa n moto r connector , the n remov e
the engin e roo m fa n assembly .
ENGINE ROO MFAN
FAN MOTO R
CONNECTO R
6 x 1. 0 m m10 N- m (1. 0 kg-m , 7 Ib-ft )
6. Remov e th e rea r tri m panel s behin d th e passenger' s
seat , the n disconnec t fou r connector s fro m th e
engin e contro l modul e (ECM ) an d thre e connector s
fro m th e floo r wir e harness .
ENGINE WIR E
HARNES S
ECM
FLOO R WIR E
HARNES S
CORROSIO N RESISTAN T BOL T
7. Disconnec t th e spar k plu g voltag e detectio n modul e
connectors , ground cable an d engin e wir e harnes s
clamps .
SPARK PLU G VOLTAG EDETECTIO N MODUL ECONNECTOR S
GROUND
CABLE
ENGIN E WIR E
HARNES S CLAMP S
8. Disconnec t th e fue l pum p resisto r connector , injec -
to r resisto r connecto r an d groun d cable .
FUEL PUM P RESISTO R
CONNECTO R
GROUND CABL E
INJECTO R RESISTO R
CONNECTO R
ProCarManuals.com

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
(cont'd)ProCarManuals.com