1997 ACURA NSX Service Repair Manual

7-6
7-1 8
7-1 8
Specia l Tool s
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Engine Bloc k
Illustrate d Inde x
Lubricat e al l interna l part s wit h engin e oi l durin g reassembly .
NOTE:
• Appl y liqui d gaske t t o th e matin g surface s o f th e lef t
side cove r an d oi l pum p cas e befor e installin g them .
• Us e liqui d gasket , par t No . 0871 8-000 1 o r 0871 8-
0003 .
• I f th e botto m of th e oi l pa n is deformed , i t shoul d
be repaire d o r th e oi l pa n shoul d b e replace d re -
tain prope r clearanc e betwee n th e scree n an d
the bottom .
COVER
DRIV E PLAT E (A/T )
Check fo r cracks .
SPECIA L WASHER
12 x 1. 0 m m74 N- m (7. 5 kgf-m , 5 4 Ibf-ft )
Torqu e sequence , pag e 7- 6
12 x 1. 0 m m103 N- m (10. 5 kgf-m , 7 6 Ibf-ft )
Torqu e sequence , pag e 7- 6
6 x 1. 0 m m14 N- m (1. 4 kgf-m , 1 0 Ibf-ft )
OIL PA N• D o no t defor mthe bottom .• Refe r t o pag e 8-1 0whe n installing .
OIL PA N GASKE T
Replac e
6 x 1. 0 m m12 N- m (1. 2 kgf-m , 8. 7 Ibf-ft )
O-RIN G
Replace .
CRANKSHAF T
OI L SEA L
Installation , pag e 8- 9Replace .
CRANKSHAF T OI L SEA L
Installation , pag e 7-1 8Replace .
SPECIAL BOL T6 x 1. 0 m m12 N- m (1. 2 kgf-m ,8.7 Ibf-ft )Replace .
OIL PAS SPIPE/JOIN T
LEFTSIDE COVE RApply liqui d gaske tto matin g surface .
DOWEL PIN S
OIL PUM POverhaul , pag e 8- 7
Removal/Inspection ,
pag e 8- 8
Appl y liqui d gaske tto matin g surface . SPECIA
L BOLT S
8 x 1.2 5 mm22 N- m (2. 2 kgf-m ,
1 6 Ibf-ft )
Replace .
SPECIAL BOLT S6 x 1. 0 m m12 N- m (1. 2 kgf-m , 8. 7 Ibf-ft )Replace .
FLYWHEE L (M/T )Runout , sectio n 1 2
COVE R
OIL SCREE N
O-RING S
Replace .BAFFL
E PLAT E
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Engine Bloc k
Illustrate d Inde x (cont'd )
Lubricate al l interna l part s wit h engin e oi l durin g reassembly .
MAIN BEARIN GCAP BRIDG E
MAI N BEARIN G
CAP
CRANKSHAF TEnd play , pag e 7- 6
Runout , Taper , an d
Out-of-Round , pag e 7-1 1
Installation , pag e 7-1 9
THRUS T WASHER S
Replacement , pag e 7- 6
Groove d side s fac e outward .
NOTE : Thrus t washe r thicknes s
is fixe d an d mus t no t b e change dby grindin g o r shimming .
10 x 1.2 5 mm49 N- m (5. 0 kgf-m , 3 6 Ibf-ft )Apply engin e oi l t o th e
bol t thread s an d th e washers .
11 x 1. 5 m m65 N- m(6.6 kgf-m , 4 8 Ibf-ft )Apply engin e oi l t o th e bol tthread s an d th e washers .
NOTE : Afte r torquin g
eac h cap , tur n crankshaf t
t o chec k fo r binding .
9 x 1.2 5 mm39 N- m (4. 0 kgf-m , 2 9 Ibf-ft )Apply engin e oi l t o th e
bol t threads .
DOWE L PI N
MAI N BEARING S
Radia l clearance , pag e 7- 7
Selection , pag e 7- 8
NOTE : Ne w mai n bearing s
must b e selecte d b y matchin gcrank an d bloc k identificatio n
markings .
6 x 1. 0 m m12 N- m (1. 2 kgf-m ,8.7 Ibf-ft )
DOWE L PI N
OI
L BREATHIN G
COVER
O-RIN GReplace .
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NOTE: Ne w ro d bearing s mus t b e selecte d b y matchin g
connectin g ro d assembl y an d crankshaf t identificatio n
markings (se e pag e 7-8 ).
TIMIN GBELTSIDE
CAUTION :
• Th e pisto n skir t i s coate d wit h molybdenum ;
handle th e pisto n carefull y t o preven t an y
damage .
• Th e connectin g rod s ar e mad e o f titanium . At -
temptin g t o remov e th e pisto n pi n wit h conven -
tional sho p equipmen t wil l damag e th e connec -
ting rod .
• I f th e piston , connectin g rod , o r pisto n pi n re -
quir e replacement , al l thre e mus t b e replace d a s
an assembly .
PISTONInspection , pag e 7-1 2NOTE :• Befor e removin g piston , inspec t th e to p
o f th e cylinde r bor e fo r carbo n build-u p
o r ridge . Remov e ridg e i f necessary , pag e 7-9 .
• T o maintai n prope r pisto n clearance , matc h
th e lette r o n th e pisto n to p (N o lette r denote s A. )
with th e lette r fo r eac h cylinde r stampe d o n th eblock .
CONNECTIN G RO D ASSEMBL Y
End play , pag e 7- 6Selection , pag e 7-1 4
CONNECTIN G RO D
BEARING SClearance , pag e 7- 7
Selection , pag e 7- 8 PISTO
N RING S
Replacement , pag e 7-1 5
Measurement , page s 7-1 5 an d 7-1 6
Alignment , pag e 7-1 6
CONNECTIN G RO D
WASHE R
CONNECTIN G RO D CA P NU T8 x 0.7 5 m m20 N- m (2. 0 kgf-m , 1 4 Ibf-ft )then tur n 116 °Appl y engin e oi l t o th e
nu t threads .
Afte r torquin g eac h bearin g
cap , rotat e crankshaf t t o
chec k fo r binding . CYLINDE
R BOR E SIZE S
NOTE : T o maintai n prope r pisto n clearance ,
matc h thes e letter s wit h th e letter s o n th e
pistons . Th e letter s o n th e bloc k rea d fro mleft t o right , No . 1 throug h No . 3 . cylinder s
o n th e firs t lin e an d No . 4 throug h No . 6
cylinder s o n th e secon d line .
CONNECTIN G RO D BEARIN G CA P
Installation , pag e 7-1 9
NOTE : Instal l cap s s o th e bearin g reces s is
o n th e sam e sid e a s th e reces s in th e rod . Inspec
t to p o f eac h cylinde r bor e
fo r carbo n build-u p o r ridg e
befor e removin g piston .
Remov e ridg e if necessary , pag e 7- 9
ENGIN E BLOC KCylinde r bor e inspection , pag e 7-12
Warpag e inspection , pag e 7-12
Cylinde r bor e honing , pag e 7-13
CONNECTIN
G RO D BOL T
FRON
T
REAR
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Flywheel an d Driv e Plat e
Replacemen t
Connecting Rod s an d
Crankshaf t
Manual Transmission :
Remove th e eigh t flywhee l bolts , the n separat e th e
flywhee l fro m th e crankshaf t flange . Afte r installation ,
tighten th e bolt s i n th e sequenc e shown .
RING GEA R HOLDE R07LAB-PV0010 0 or07924-PD2000 3
RING GEA R HOLDE R07LAB-PV00100 or07924-PD2000 3
ENGINEBLOCK
RING GEA RInspec t rin g gea rteeth fo r wea r an ddamage .
12 x 1. 0 m m103 N- m(10. 5 kgf-m , 7 6 Ibf-ft )
Automati c Transmission :
Remov e th e eigh t driv e plat e bolts , the n separat e th e
driv e plat e fro m th e crankshaf t flange . Afte r installa -
tion, tighte n th e bolt s i n th e sequenc e shown .
12 x 1. 0 m m74 N- m(7.5 kgf-m , 5 4 Ibf-ft )
End Pla y
Connectin g Ro d En d Play :
Standard (New): 0.15-0.30 mm
(0.006-0.01 2 in )
Servic e Limit : 0.40 m m (0.01 6 in )
CONNECTIN G RO D CRANKSHAF T
• I f out-of-tolerance , instal l a ne w connectin g rod .
• I f stil l out-of-tolerance , replac e th e crankshaf t
(se e page s 7-9 , 7-1 0 an d 7-1 9 to 7-22 ).
Pus h th e crankshaf t firml y awa y fro m th e dia l indicator ,
an d zer o th e dia l agains t th e en d o f th e crankshaft . The n
pul l th e crankshaf t firml y bac k towar d th e indicator ; dia l
readin g shoul d no t excee d servic e limit .
SCREWDRIVE R
Crankshaft En d Play :
Standar d (New) : 0.1 0 — 0.3 5 m m
(0.004-0.01 4 in)
Servic e Limit : 0.4 5 m m (0.01 8 in )
• I f en d pla y i s excessive , inspec t th e thrus t
washer s an d thrus t surfac e o n th e crankshaft .
Replace part s a s necessary .
NOTE : Thrus t washe r thicknes s i s fixe d an d mus t
no t b e change d eithe r b y grindin g o r shimming .
Thrus t washer s ar e installe d wit h groove d sid e fac -
ing outward .
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Main Bearing s
Clearanc e
1. T o chec k mai n bearing-to-journa l oi l clearance ,
remov e th e mai n cap s an d bearin g halves .
2 . Clea n eac h mai n journa l an d bearin g hal f wit h a
clea n sho p towel .
3 . Plac e on e stri p o f plastigag e acros s eac h mai n jour -
nal.
NOTE : I f th e engin e i s stil l i n th e ca r whe n yo u bol t
th e mai n ca p dow n t o chec k clearance , th e weigh t
o f th e crankshaf t an d flywhee l wil l flatte n th e plasti -
gag e furthe r tha n jus t th e torqu e o n th e ca p bolts ,
an d giv e yo u a n incorrec t reading . Fo r a n accurat e
reading , suppor t th e cran k wit h a jac k unde r th e
counterweights , an d chec k onl y on e bearin g a t a
time .
4. Reinstal l th e bearings , cap s an d ca p bridge , the n
torqu e th e 9 m m bridg e bolt s t o 3 9 N- m (4. 0 kgf-m ,
2 9 Ibf-ft) . Torqu e th e 1 1 m m ca p bolt s t o 6 5 N- m
(6. 6 kgf-m , 4 8 Ibf-ft) .
5 . Torqu e th e sid e bolt s t o 4 9 N- m (5. 0 kgf-m , 3 6 Ibf-ft) .
6 . Remov e th e bridge , cap s an d bearings , an d
measur e th e wides t par t o f th e plastigage .
Mai n Bearing-to-journa l Oi l Clearance :
Standar d (New) : 0.024—0.04 8 m m
(0.0009-0.0019 in)
Servic e Limit : 0.05 0 m m (0.002 0 in )
PLASTIGAG E STRI P
7. I f th e plastigag e measure s to o wid e o r to o narrow ,
(remov e th e engin e if it' s stil l i n th e car) , remov e th e
crankshaft , an d remov e th e uppe r hal f o f th e bear -
ing . Instal l a new , complet e bearin g wit h th e sam e
colo r cod e (selec t th e colo r a s show n o n nex t page) ,
and rechec k th e clearance .
CAUTION: D o no t file , shim , o r scrap e the bear -
ing s o r th e cap s t o adjus t clearance .
8 . I f th e plastigag e show s th e clearanc e i s stil l incor -
rect , tr y th e nex t large r o r smalle r bearin g (th e colo r
liste d abov e o r belo w tha t one) , an d chec k again .
NOTE : I f th e prope r clearanc e canno t b e obtaine d
b y usin g th e appropriat e large r o r smalle r bearings ,
replac e th e crankshaf t an d star t over .
Connectin g
Rod Bearing s
Clearanc e
1. Remov e th e connectin g ro d ca p an d bearin g half .
2 . Clea n th e crankshaf t ro d journa l an d bearin g hal f
wit h a clea n sho p towel .
3 . Plac e plastigag e acros s th e ro d journal .
4 . Reinstal l th e bearin g hal f an d cap , an d torqu e th e
nut s a s show n o n pag e 7-20 .
NOTE : D o no t rotat e th e crankshaf t durin g inspection .
5 . Remov e th e ro d ca p an d bearin g hal f an d measur e
th e wides t par t o f th e plastigage . Mak e sur e th e
clearanc e betwee n th e connectin g ro d an d th e
bearin g i s withi n th e standar d show n below .
Connectin g Ro d Bearing-to-Journa l Oi l Clearance :
Standar d (New) : 0.04 0 - 0.06 4 m m
(0.0016-0.002 5 in )
Servic e Limit : 0.06 4 m m (0.002 5 in )
PLASTIGAG E STRI P
6. I f th e plastigag e measure s to o wid e o r to o narrow ,
remov e th e uppe r hal f o f th e bearing , instal l a new ,
complet e bearin g wit h th e sam e colo r cod e (selec t
colo r a s show n o n nex t page) , an d rechec k th e
clearance .
CAUTION : D o no t file , shim , o r scrap e th e bearin g
o r th e cap s t o adjus t clearance .
7 . I f th e plastigag e show s th e clearanc e i s stil l incor -
rect , tr y th e nex t large r o r smalle r bearin g (th e colo r
liste d abov e o r belo w tha t one) , an d chec k
clearanc e again .
NOTE : I f th e prope r clearanc e canno t b e obtaine d
b y usin g th e appropriat e large r o r smalle r bearings ,
replac e th e crankshaf t an d star t over .
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Main Bearing s
Selection
CAUTION : I f th e code s ar e indecipherabl e becaus e o f
an accumulatio n o f dir t an d dust , d o no t scru b the m
with a wir e brus h o r scraper . Clea n the m onl y wit h sol -
ven t o r detergent .
Crankshaf t Bor e Cod e Location s
Letter s o r bar s hav e bee n stampe d o n th e en d o f th e
bloc k a s a cod e fo r th e siz e o f eac h o f th e fou r mai n jour -
nal bores . Us e them , an d th e number s stampe d o n th e
crankshaf t (code s fo r mai n journa l size) , t o choos e th e
correc t bearings .
No. 4 JOURNA L(FLYWHEE L END )
Main Journa l Cod e Location s(numbers o r bars )
No. 4 JOURNA L(FLYWHEE L END )
No. 1 JOURNA L(PULLEY END )
No. 1 JOURNA L(PULLEY END )
Bearin g Desig n
COLOR
GROOV E
UPPER BEARIN G
COLOR
LOWE R BEARIN G
Bearing Identificatio n
Color cod e i s o n th e
edg e o f th e bearin g
Smallermainjourna l
Smalle rbearing(thicker )
NOTE: Whe n usin g bearin g halve s o f differen t col -
ors , i t doe s no t matte r whic h colo r i s use d i n th e
top o r bottom .
Connectin g Ro d Bearing s
Selection
CAUTION : I f th e code s ar e indecipherabl e becaus e o f
an accumulatio n o f dir t an d dust , d o no t scru b the m
with a wir e brus h o r scraper . Clea n the m onl y wit h sol -
ven t o r detergent .
Connectin g Ro d Journa l Cod e Locatio n
Number s hav e bee n stampe d o n th e sid e o f eac h con -
nectin g ro d a s a cod e fo r th e siz e o f th e bi g end . Us e
them , an d th e letter s stampe d o n th e crankshaf t (code s
for ro d journa l size) , t o choos e th e correc t bearings .
Half o f numbe r i sstampe d o n bearin gcap an d th e othe rhalf i s stampe d o nrod .
Rod Journa l Cod e Location s (letter s o r bars )
No. 1 JOURNA L(PULLEY END )
Bearin g Identificatio n
Color cod e i s o n th eedg e o f th e bearin g
No. 6 JOURNA L(FLYWHEE L END )
Smalle rrodjourna l
Smalle rbearing(thicker )
NOTE: Whe n usin g bearin g halve s o f differen t col -
ors, i t doe s no t matte r whic h colo r i s use d i n th e
top o r bottom .
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Piston/Connecting Ro d Assemblie s an d Crankshaf t
Removal
1. Remov e th e lef t sid e cover .
LEFT SID E COVE R
2. Remov e th e oi l screen .
BAFFLE PLAT E
OIL SCREE N
O-RING S
Replace
OIL PUM P
3. Remov e th e baffl e plate .
4 . Remov e th e oi l pas s pip e an d joint .
5. Remov e th e oi l pump .
6. I f yo u ca n fee l a ridg e o f meta l o r har d carbo n
around th e to p of an y cylinder , remov e i t wit h a
ridg e reamer . Follo w reame r manufacturer' s
instructions.
CAUTION: I f th e ridg e i s no t removed , i t ma y
damag e th e piston s a s the y ar e pushe d out .
RIDG E REAME R
7. Remov e th e bearin g ca p bridge .
BEARIN G CA PBRIDG E
OIL PAS SPIPE
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