ACURA NSX 1997 Service Repair Manual

Special Tool s
07HA H - PJ7010 B
07JA A - 001020 A
07JA B - 001020 A
07MA A - PR7011 0
07MA A - PR7012 0
07MA F - PR9010 A
07MA J - PR7020 A
07NA B - 001030 A
07NA B - 001040 A
0774 2 - 001010 0
0775 7 - PJ1010 A Valv
e Guid e Reamer , 5. 5 m m
Socket , 1 9 m m
Holde r Handl e
Tappe t Adjuste r
Tappe t Locknu t Wrenc h
Valv e Sprin g Compresso r Attachmen t
Extensio n
VTE C Plu g
Holde r Attachment , 4 5 m m
Holde r Attachment , 5 0 m m
Valv e Guid e Driver , 5. 5 m m
Valv e Sprin g Compresso r Attachmen t
6-43
6-1 2
6-12
6-1 0
6-1 0
6-3 7
6-7 ,
6-8
6-1 2
6-1 2
6-42 , 6-43
6-37
ProCarManuals.com

VTEC

VTEC Solenoid Valve Inspection

1. Disconnect the 2P connector from the VTEC sole-

noid valve.

2. Measure resistance between the BLU/YEL (front/rear)

terminals and body ground.

BLU/YEL

3. If the resistance is within specifications, remove the

VTEC solenoid valve from the cylinder head, and

check the VTEC solenoid valve filter for clogging.

• If there is clogging, replace the engine oil filter

and engine oil.

VTEC SOLENOID VALVE

VTEC SOLENOID VALVE

FILTER/O-RING

Replace.
4. If the filter is not clogged, push the VTEC solenoid

valve with your finger and check its movement.

• If VTEC solenoid valve is normal, check the engine

oil pressure.ProCarManuals.com

Rocker Arm s — Manua l Inspectio n
1. Remov e th e ignitio n coi l cover s (se e pag e 6-15 ).
2 . Remov e th e ignitio n coil s (se e pag e 6-15 ).
3 . Remov e th e cylinde r hea d covers .
NOTE : Refe r t o page s 6-49 , 6-5 0 whe n installin g th e
cylinde r hea d cover .
4 . Se t th e No . 1 pisto n a t to p dea d cente r (TDC ) (se e
pag e 6-19 ).
5 . Pus h th e mi d rocke r arm s o n th e No . 1 cylinde r man -
ually.
6. Chec k tha t th e mi d rocke r arm s mov e independentl y
o f th e primar y an d secondar y rocke r arms .
MID ROCKE RARMSECONDAR YROCKER AR M
PRIMAR YROCKER AR M
7. Chec k th e mi d rocke r arm s o f eac h cylinde r a t TDC .
• I f a mi d rocke r ar m doe s no t move , remov e th e
mid , primar y an d secondar y rocke r arm s a s a n
assembl y an d chec k tha t th e piston s i n th e mi d
an d primar y rocke r arm s mov e smoothly .
• Replac e th e rocke r arm s a s a n assembl y i f ther e
is an y abnormality .
ProCarManuals.com

Rocker Arm s — Inspectio n Usin g
Specia l Tool s
CAUTION :
• Befor e usin g th e specia l tool , mak e sur e tha t th e ai r
pressur e gaug e o n th e ai r compresso r indicate s ove r
250 kP a (2. 5 kgf/cm2, 3 6 psi) .
• Inspec t th e valv e clearanc e befor e rocke r ar m inspec -
tion.
• Cove r th e timin g bel t wit h a sho p towe l t o preven t
getting oi l o n th e belt .
• Chec k th e mi d rocke r arm s o f eac h cylinde r a t TDC .
1. Plu g th e relie f hol e wit h th e specia l too l a s shown .
Front cylinde r head :
RELIE F HOL E
VTEC PLU G
07MA J - PR7020 A
VTE C INSPECTIO N HOL E
SEALIN G BOL T
Rear cylinde r head :
RELIE F HOL E VTE
C PLU G
07MA J - PR7020 A
VTE C INSPECTIO N HOL E
SEALIN G BOL T
(cont'd )
ProCarManuals.com

VTEC
Rocke r Arm s — Inspectio n Usin g Specia l Tool s (cont'd )
2. Remov e th e 1 0 m m sealin g bol t an d washe r fro m
th e inspectio n hol e an d connec t th e tools .
VTEC PLU G07MAJ-PR7020 A
REGULATOR VALV E
(Commerciall y
available )
• Pul l th e leve r an dturn to adjust .
INSPECTIO N HOL E
ADAPTE R
l0 x 1.0 m m(Commerciall y
available ) WASHE
R
Replace .
3. Appl y th e specifie d ai r pressur e t o th e rocke r ar m
piston s afte r loosenin g th e regulato r valv e o n th e
VTE C inspectio n attachment . 4
. Mak e sur e tha t th e primar y an d secondar y rocke r
arm s ar e mechanicall y connecte d b y piston s an d tha t
th e mi d rocke r arm s d o no t mov e whe n pushe d
manually .
PRIMARY
ROCKE R ARM
LOS T MOTIO N
ASSEMBL Y SECONDAR
Y
ROCKE R AR M
MI D ROCKE R
ARM
• I f a mi d rocke r ar m move s independentl y o f th e
primar y an d secondar y rocke r arms , replac e th e
rocke r arm s a s a set .
5 . Remov e th e tools .
6 . Chec k th e operatio n of the los t motio n assembl y b y
pushin g o n th e mi d rocke r arm . Th e los t motio n
assembl y shoul d compres s full y an d operat e
smoothly throug h its ful l stroke . Replac e the
assembl y i f i t doe s no t wor k smoothly .
After inspection , chec k tha t th e Malfunctio n Indicato r
Lamp doe s no t sho w a n erro r code .
ProCarManuals.com

Valve Clearanc e
Adjustmen t
NOTE:
• Valve s shoul d b e adjuste d cold , whe n th e cylinde r
hea d temperatur e is les s tha n 100° F (38°C) .
• Adjustmen t i s th e sam e fo r bot h intak e an d exhaus t
valves .
• Adjus t valv e clearanc e a t TD C o f eac h cylinder .
• D o no t rotat e th e engin e counterclockwise . Th e tim -
in g bel t coul d jum p a toot h o n th e camshaf t pulleys .
1 . Remov e th e cylinde r hea d covers .
NOTE : Refe r t o page s 6-49 , 6-5 0 whe n installin g th e
cylinde r hea d cover .
EXHAUS T
INTAK E
INTAK E
EXHAUS T
2. Rotat e th e crankshaf t t o se t No . 1 pisto n a t TDC .
• TD C mar k (whit e paint ) o n th e crankshaf t pulle y
shoul d alig n wit h pointe r o n th e timin g lowe r
cover , an d TD C groove s o n th e camshaf t pulley s
shoul d alig n wit h timin g bel t cove r plates .
Numbe r 1 PISTO N a t TD C
TDC MAR K (WHIT E PAINT )
CRANKSHAF T PULLE Y
(cont'd)
ProCarManuals.com

Valve Clearanc e
Adjustmen t (cont'd )
3. Manuall y inspec t th e rocke r arm s fo r independen t
operatio n (se e page s 6-7 , 6-8 ).
4 . Adjus t valve s o n No . 1 cylinder .
• Adjustin g screw s ar e o n primar y an d secondar y
rocke r arms .
Intake : 0.15-0.1 9 m m (0.006-0.00 7 in )
Exhaust : 0.17-0.2 1 m m (0.007-0.00 8 in )
5. Loose n th e locknut , an d tur n th e adjustmen t scre w
unti l th e feele r gaug e slide s bac k an d fort h wit h a
sligh t amoun t o f drag .
TAPPE T ADJUSTE R07MAA-PR7011 0
FEELERGAUGE
TAPPE T LOCKNU T
WRENC H
07MAA-PR7012 0
NOTE: Us e a mirro r t o chec k i f th e specia l too l i s
positione d o n th e locknu t correctly .
FEELERGAUGE
6. Tighte n th e locknu t an d chec k th e clearanc e again .
Repea t adjustmen t i f necessary .
FEELERGAUGE
FEELE RGAUGE
ProCarManuals.com

7. Rotat e th e crankshaf t 120 ° clockwis e (camshaf t pulle y
turn s 60°) . Chec k tha t th e fron t intak e camshaf t pulle y
i s positione d a s shown .
Repea t ste p 3 to ste p 6 .
Numbe r 4 pisto n a t TDC :
8 . Rotat e th e crankshaf t 120 ° clockwis e (camshaf t pulle y
turn s 60°) . Chec k tha t th e fron t intak e camshaf t pulle y
is positione d a s shown .
Repea t ste p 3 to ste p 6 .
Numbe r 2 pisto n a t TDC :
9 . Rotat e th e crankshaf t 120 ° clockwis e (camshaf t pulle y
turn s 60°) . Chec k tha t th e fron t intak e camshaf t pulle y
i s positione d a s shown .
Repea t ste p 3 to ste p 6 .
Numbe r 5 pisto n a t TDC : 10
. Rotat e th e crankshaf t 120 ° clockwis e (camshaf t pulle y
turn s 60°) . Chec k tha t th e fron t intak e camshaf t pulle y
i s positione d a s shown .
Repea t ste p 3 to ste p 6 .
Numbe r 3 pisto n a t TDC :
11 . Rotat e th e crankshaf t 120 ° clockwis e (camshaf t pulle y
turn s 60°) . Chec k tha t th e fron t intak e camshaf t pulle y
is positione d a s shown .
Repea t ste p 3 to ste p 6 .
Numbe r 6 pisto n a t TDC :
ProCarManuals.com

Crankshaft Pulle y an d Pulle y Bol t
Replacemen t
When installin g an d tightenin g th e pulley , follo w th e procedur e below .
Clean , remov e an y oi l an d lubricat e point s show n below .
Clean
Remov e an y oi l
Lubricat e
CRANKSHAF TPULLEY
WASHE R
PULLEY BOL T TIMIN
G BEL T
DRIV E PULLE Y CRANKSHAF
T
TIMIN G BEL T
GUID E PLAT E TIMIN
G BEL T
GUID E PLAT E
Crankshaf t pulle y bol t siz e an d torqu e value :
16 x 1. 5 m m
245 N- m (25. 0 kgf-m , 18 1 Ibf-ft )
NOTE :
• D o no t us e a n impac t wrenc h whe n installing .
• Mak e sur e th e handl e thum b scre w align s wit h th e hol e in th e attachment .
HOLDER HANDL E
07JAB-001020 A M/T
: HOLDE R ATTACHMENT , 4 5 m m
07NA B - 001030 A
A/T : HOLDE R ATTACHMENT , 5 0 m m
07NA B - 001040 A
TORQU E WRENC H
SOCKET, 1 9 m m
07JA A - 001020 A
o r (Commerciall y available )
ProCarManuals.com

Timing Bel t
Illustrate d Inde x
NOTE :
• Refe r t o pag e 6-1 8 fo r positionin g crankshaf t an d pulle y befor e installin g th e belt .
• I f i t i s t o b e reused , mar k th e directio n o f rotatio n o n th e bel t befor e removin g it .
• D o no t us e th e middl e cove r an d lowe r cove r t o stor e remove d items .
• Clea n th e middl e cove r an d lowe r cove r befor e installin g them .
• Replac e th e camshaf t seal s an d crankshaf t seal s i f ther e i s oi l leakage .
• Refe r t o pag e 6-1 2 befor e installin g timin g belt .
CYLINDE R HEA D COVE RRefer t o page s 6-49 , 6-5 0whe n installing .
HEAD COVE R GASKE TReplace whe n leaking ,
damage d o r deteriorated .
Appl y liqui d gaske t a t
th e eigh t corner s o f th e
recesses .
RUBBER SEAL SReplac e whe n damage dor deteriorated .
WASHERSReplace whe n damage d
o r deteriorated .
RUBBER SEAL SReplac e whe n damage dor deteriorated .
MIDDLECOVER
RUBBE R SEAL SReplac e whe n damage dor deteriorated . ADJUSTIN
G BOL T
10 x 1.2 5 mm42 N- m (4. 3 kgf-m , 3 1 Ibf-ft )For adjustmen t only ,
d o no t remove .
LOWER COVE R
6 x 1. 0 m m12 N- m (1. 2 kgf-m ,8.7 Ibf-ft )
CRANKSHAF TPULLEYReplacement ,page 6-1 2
PULLE Y BOL T16 x 1. 5 m m245 N- m (25. 0 kgf-m ,181 Ibf-ft )Replacement ,page 6-1 2Do no t us e a n impac t
wrenc h whe n installing . TIMIN
G BEL T
Inspection , pag e 6-1 4
Adjustment , pag e 6-1 4
Instal l wit h concav e
surfac e facin g out .
ProCarManuals.com