ACURA NSX 1991 Service Repair Manual

Wheel Alignment

Height

NSX/NSX-T four wheel alignment requires the use of equipment designed specifically for four wheel independent

suspensions and capable of immediate feedback.

NOTE: For proper inspection/adjustment of the wheel alignment, check and adjust the following before checking

the alignment.

• Check that the suspension is not modified.

• Check the tire size and tire pressure.

• Check the runout of the wheels and tires.

• Check the suspension ball joints. (Hold a wheel with your hands, then move the wheel up and down and right

and left to check for wobbling.)

• Check the height of each suspension (see below).

Standard value

Front:

Ground clearance to the center of the lower

control arm bolt
Rear:

Ground clearance to the center of the toe con-

trol arm bolt

Height inspection:

• Before checking for the height, bounce the car up and down several times before measuring.

• Check the height with the car empty, parked on a level surface, with properly inflated tires (tread wear indicators must

not be showing). If the height is out of specification, load or unload the car as necessary.ProCarManuals.com

Front Wheel Alignment Adjusting Procedure

Adjustment

NOTE: NSX/NSX-T four wheel alignment requires the use of equipment designed specifically for four wheel independent

suspensions and capable of immediate feedback.

The NSX/NSX-T suspension can be adjusted for camber, caster (front only), and toe. However, because each of them

relates to the other, the camber changes when the toe is adjusted for example. Therefore, the total adjustment of the

front/rear wheel alignment is required whenever one of the elements (camber, caster, or toe) is adjusted.

Front wheel alignment adjusting procedure

Check tire pressure on both sides.

Check the ride height on both sides.

Measure and adjust both camber and toe of the

left side.

Measure and adjust both camber and toe of the

right side.

Adjust caster on both sides.

Measure and readjust both camber and toe of

the left side.

Measure and readjust both camber and toe of

the right side.
CASTER

TOP VIEW
CAMBERProCarManuals.com

Wheel Alignmen t
Front Whee l Alignmen t Adjustmen t Procedur e
NOTE:
• NSX/NSX- T fou r whee l alignmen t require s th e us e o f
equipmen t designe d specificall y fo r fou r whee l in -
dependen t suspension s an d capabl e o f immediat e
feedback.
• Th e rid e heigh t i s ver y importan t fo r settin g th e align -
ment . Fo r ever y 1 0 m m (0. 4 in ) o f chang e i n th e
fron t rid e height , th e cambe r wil l chang e approx -
imatel y 1 0 minutes .
• Th e fron t alignmen t setting s o n th e NS X ar e
interactive .
• A sligh t chang e i n to e wil l dramaticall y chang e th e
camber .
• Alway s inspec t an d adjus t th e fron t whee l alignmen t
with th e steerin g whee l i n th e straigh t ahea d
position .
1 . Driv e th e ca r o n th e alignmen t rack .
2 . Chec k th e tir e pressur e an d rid e heigh t (se e pag e
18-6 ).
3 . Cente r th e steerin g whee l i n th e straigh t ahea d
position , an d loc k it i n plac e wit h th e steerin g lock .
4 . Se t th e alignmen t equipmen t followin g th e
manufacturer' s instructions .
5 . Measur e an d adjus t th e cambe r an d to e o n th e lef t
side , the n measur e an d adjus t th e righ t side .
Toe:
— Loose n th e locknut , an d tur n th e righ t an d lef t
tie-rod s t o adjus t th e fron t toe .
LOCKNU T44 N- m(4.4 kg-m , 3 2 Ib-ft )TIE-RO D
Camber :
— Loose n th e self-lockin g nu t o n th e fron t lowe r
contro l ar m adjustin g point , an d adjus t th e
cambe r b y turnin g th e adjustin g cam .
SELF-LOCKIN G NU TReplace .125 N- m(12. 5 kg-m , 9 0 Ib-ft )
Corrosio n resistan t bolt/nu t
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6. Measure the caster on the both sides, and adjust the

caster to specifications.

Caster:

• Loosen the pivot adjuster mounting nuts (self-

locking nuts) under the compliance pivot, and

adjust the caster by turning the adjusting cam.

SELF-LOCKING

NUT

Replace.

85 N-m

(8.5 kg-m, 61 Ib-ft)
ADJUSTING CAM

Corrosion resistant bolt/nut

7. Remeasure and, if necessary, adjust the camber and

toe on the left side first, then the right side.

Front Specifications

Toe-out: 3.5 ± 1.0 mm (0.14 ± 0.04 in)

Camber: -0° 20' ± 30'

Caster: 8° 00' ± 45'ProCarManuals.com

Wheel Alignmen t
Front Turnin g Angl e Inspectio n
NOTE:
• Plac e a ca r o n a leve l surfac e befor e inspection .
• Releas e th e parkin g brak e an d b e sur e tha t th e ca r i s
empty .
• Chec k tha t th e suspension s ar e a t th e standar d
heigh t (se e pag e 18-6 ).
1 . Tur n th e steerin g whee l full y t o th e righ t an d lef t
whil e applyin g th e brake , an d measur e th e turnin g
angl e o f bot h wheels .
Turnin g angle : Inward : 33°0 6 ± 2°
Outward : 26°3 4 (Referenc e value )
2 . I f th e measurement s ar e no t withi n th e specifica -
tions o r i f th e inwar d turnin g angle s diffe r betwee n
the righ t an d left , chec k th e to e an d adjus t accor -
dingl y (se e pag e 18-8 ).
3 . I f th e to e adjustmen t i s withi n specifications , an d
turnin g angl e i s stil l off , chec k fo r ben t o r damage d
suspensio n components .
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Rear Whee l Alignmen t Adjustin g Procedur e
Rear whee l alignmen t adjustin g procedur e
Chec k tir e pressur e o n bot h sides .
Chec k th e rid e heigh t o n bot h sides .
Adjus t bot h cambe r an d to e o f th e lef t side .
Adjus t bot h cambe r an d to e o f th e righ t side .
TOP VIE W
CAMBE R
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Wheel Alignmen t
Rear Whee l Alignmen t Adjustin g Procedur e
NOTE:
• NSX/NSX- T fou r whee l alignmen t require s th e us e o f
equipmen t designe d specificall y fo r fou r whee l
independen t suspension s an d capabl e o f immediat e
feedback.
1. Driv e th e ca r o n th e alignmen t rack .
2 . Chec k th e tir e pressur e an d rid e heigh t a s describe d
on pag e 18-6 .
3. Cente r th e steerin g wheel .
Toe
— 1. Measur e th e lengt h o f th e threade d sectio n o n
th e righ t an d lef t to e contro l arms .
Standard : 4 0 m m (1. 6 in )
Differenc e betwee n righ t an d left :
1.0 m m (0.0 4 in) max .
— 2. I f th e measuremen t i s ou t o f specification ,
loose n th e locknuts , an d adjus t th e rea r to e b y
turnin g th e righ t an d lef t tie-rods .
LOCK NUT S55 N- m(5.5 kg-m , 4 0 Ib-ft )
TIE-RO D
LENGTH
Corrosio n resistan t bolt/nu t
Camber
— 1. Loose n th e self-lockin g nu t o n th e rea r lowe r
contro l ar m adjustin g point , the n adjus t th e ca m
positio n s o tha t th e righ t an d lef t graduation s
on th e adjustin g ca m ar e i n contac t wit h
groov e wall .
— 2. Mar k th e ar m in th e positio n whic h align s wit h
th e dia l cente r of the adjustin g cam .
Graduatio n in contac twith groov e wall
SELF-LOCKIN G NU TReplace .125 N- m(12. 5 kg-m , 9 0 Ib-ft )
DIAL CENTE R
Corrosio n resistan t bolt/nu t
4. Measur e th e reading s fo r cambe r an d to e accordin g
t o th e alignmen t equipmen t manufacturer' s
instructions .
5 . Adjus t th e cambe r an d to e a t th e sam e tim e o n on e
sid e o f th e car . Repea t fo r th e othe r sid e of the car .
Rear Specification s
Toe-in: 4. 0 ± 1. 0 m m (0.1 6 ± 0.0 4 in )
Camber : - 1°30 ' ± 30'
ADJUSTIN G CA M
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Runout
1. Rais e th e ca r of f th e ground , an d suppor t i t wit h safe -
t y stand s i n th e prope r location s (se e sectio n 1 ).
2 . Plac e th e dia l gaug e o n eac h fron t an d rea r whee l
rim, an d tur n th e whee l slowl y b y hand . Chec k th e
axia l an d radia l runou t fo r front/rea r wheel .
Fron t an d Rea r Whee l Axia l Runout :
Standard : 0-0. 7
mm (0-0.0 3 in)
Servic e Limit : 2. 0 m m (0.0 8 in )
Fron t an d Rea r Whee l Radia l Runout :
Standard : 0—0. 7 m m (0—0.0 3 in )
Servic e Limit : 1. 5 m m (0.0 6 in )
• I f th e whee l axia l runou t exceed s th e servic e limit ,
chec k th e bearin g en d play .
• I f th e bearin g en d pla y i s withi n th e servic e limit ,
replac e th e wheel .
Bearing En d Pla y
Fron t Whee l En d Play :
Standard : 0 mm (0 in )
Servic e limit : 0.0 5 m m (0.00 2 in ) max .
Rear Whee l En d Play :
Standard : 0 mm (0 in )
Servic e limit : 0.0 5 m m (0.00 2 in ) max .
Replac e th e whee l bearin g wit h ne w on e i f th e servic e
limit i s exceeded .
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Front Suspension

Torque Specifications

CAUTION:

• Replace the self-locking nuts after removal.

• Replace the self-locking bolts if you can easily thread a non-self-locking nut past their nylon locking inserts. (It should

require 1 N-m (0.1 kg-m, 0.7 Ib-ft) of torque to turn the test nut on the bolt).

• The vehicle should be on the ground before any bolts or nuts connected to rubber mounts or bushings are tightened.

• Torque the castle nut to the lower torque specification, then tighten it only far enough to align the slot with the pin

hole. Do not align the nut by loosening.

NOTE: Wipe off any dirt, oil or grease from the threads before tightening the fasteners.

: Corrosion resistant bolt/nut.

FLANGE BOLT

10 x
1.25
mm

60 N-m (6.0 kg-m, 43 Ib-ft)

CASTLE NUT

12 x
1.25
mm

55-65
N-m
(5.5-6.5
kg-m,
40-47
Ib-ft)

SELF-LOCKING NUTS

12 x
1.25
mm

Replace.

95 N-m (9.5 kg-m. 69 Ib-ft)
SELF-LOCKING NUT

10 x
1.25
mm

Replace.

44 N-m (4.4 kg-m, 32 Ib-ft)

SELF-LOCKING NUT

12 x
1.25
mm

Replace.

125 N-m (12.5 kg-m, 90 Ib-ft)

CASTLE NUT

12 x
1.25
mm

55-65
N-m
(5.5-6.5
kg-m,
40-47
Ib-ft)

SELF-LOCKING NUT

12 x
1.25
mm

Replace.

95 N-m (9.5 kg-m. 69 Ib-ft)

FLANGE BOLT

10 x
1.25
mm

60 N-m (6.0 kg-m, 43 Ib-ft)

FLANGE BOLT

12 x
1.25
mm

95 N-m (9.5 kg-m, 69 Ib-ft)

SELF-LOCKING NUT

12 x
1.25
mm

Replace.

85 N-m (8.5 kg-m, 61 Ib-ft)
CASTLE NUT

10 x
1.25
mm

40-48
N-m

(4.0-4.8
kg-m,

29-35
Ib-ft)

CASTLE NUT

12 x
1.25
mm

55-65
N-m
(5.5-6.5
kg-m,
40-47
Ib-ft)

FLANGE BOLT

12 x
1.25
mm

95 N-m (9.5 kg-m, 69 Ib-ft)
CALIPER BRACKET

MOUNTING BOLT

110 N-m

(11 kg-m, 80 Ib-ft)
CASTLE NUT

12 x
1.25
mm

55-65
N-m
(5.5-6.5
kg-m,

40-47
Ib-ft)
SELF-LOCKING NUTS

12 x
1.25
mm

Replace.

85 N-m (8.5 kg-m. 61 Ib-ft)ProCarManuals.com

Hub Replacemen t
NOTE:
• Us e onl y genuin e Hond a whee l weight s fo r aluminu m wheels . Non-genuin e whee l weight s ma y corrod e an d damag e
th e aluminu m wheels .
• O n th e aluminu m wheels , remov e th e cente r ca p fro m insid e o f th e whee l afte r removin g th e wheel .
• Befor e installin g th e brak e disc , clea n th e matin g surfac e o f th e fron t hu b an d insid e o f th e brak e disc .
• Befor e installin g th e wheel , clea n th e matin g surface s of the brak e dis c an d insid e o f th e wheel .
Corrosio n resistan t bolt/nu t
SELF-LOCKIN G NU T
10 x 1.2 5 mmReplace .
6 5 N- m (6. 5 kg-m , 4 7 Ib-ft ) SPINDL E NU T
26 x 1. 5 m mReplace .
33 5 N- m (33. 5 kg-m , 24 2 Ib-ft )
NOTE : Afte r tightening , us e a drif t t ostak e th e spindl e nu t shoulde r agains tthe spindle .
HUB BEARIN G ASSEMBL YInspect fo r fault ymovemen t an d wear .Replacement , pag e 18-1 7
BRAK E DIS C
Chec k fo r wea r an d rust .Inspection , sectio n 19 .
FRON T HU B
Chec k fo r damag e an d
cracks .
Replacement ,page 18-1 7
WHEE L NU T
12 x 1. 5 m m110 N- m (1 1 kg-m , 8 0 Ib-ft )
FLAT HEA D SCRE W6 x 1. 0 m m10 N- m (1. 0 kg-m , 7 Ib-ft )
CENTER CA P
KNUCKL
E
PULSER
SPLAS H GUAR D
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