engine ACURA NSX 1997 Service Manual Online

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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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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Piston/Connecting Ro d Assemblie s an d Crankshaf t
Removal (cont'd )
• Remov e th e connectin g ro d cap s afte r settin g
the cran k pi n a t BD C fo r eac h cylinder . Remov e
the pisto n assembl y b y pushin g o n th e connec -
ting rod .
CAUTION : Tak e car e no t t o damag e th e cran k pi n
o r cylinde r wit h th e connectin g rod .
CORREC TPISTONS
INCORREC T
8. Remov e th e bearin g fro m th e cap . Kee p al l
caps/bearing s i n order .
9 . Remov e th e uppe r bearin g halve s fro m th e connect -
in g rods . Se t the m asid e wit h thei r respectiv e caps .
10 . Reinstal l th e ca p o n th e ro d afte r removin g eac h
piston/connectin g ro d assembly .
11 . Mar k th e piston/connectin g ro d assemblie s wit h
thei r cylinde r number s t o avoi d mixu p o n reassem -
bly.
NOTE : Th e existin g numbe r o n th e connectin g ro d
doe s no t indicat e it s positio n i n th e engine , i t in -
dicate s th e ro d bor e size . 12
. Remov e th e bearin g ca p bolt s an d bearin g ca p sid e
bolts , the n remov e th e bearin g caps .
BEARIN G CA P
BEARIN G CA PBOL T
BEARIN G CA PSIDE BOL T
• T o hel p wit h remova l o f th e caps , instal l th e bear -
in g ca p bridg e bolt s i n th e bearin g ca p bol t holes .
BEARIN G CA PBRIDG E BOL T
BEARIN G CAP S
13. Lif t th e crankshaf t ou t o f engine , bein g carefu l no t
t o damag e th e journals .
14 . Reinstal l th e mai n cap s an d bearing s o n th e bloc k in
prope r order .
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Cylinder Bloc k
Inspectio n
1. Measur e wea r an d tape r i n direction s X an d Y at
thre e level s i n eac h cylinde r a s shown .
CYLINDE R BOR E SIZE S ( A o r B )
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 let -
ter s o n th e bloc k rea d fro m lef t t o
right , No . 1 throug h No . 3 cylinder s
on th e firs t lin e an d No . 4 throug hNo. 6 cylinder s o n th e secon d line .
Cylinde r Bor e Siz e
M/T:
Standar d (New) :
A o r I 93.01 0 - 93.02 0 m m (3.661 8 -3.662 2 in )
B o r i l 93.00 0 - 93.01 0 m m (3.6614-3.661 8 in )
Servic e Limit : 93.0 7 m m (3.66 4 in )
A/T :
Standard (New):
A o r I 90.01 0 - 90.02 0 m m (3.543 7 -3.544 1 in )
B o r i l 90.00 0 - 90.01 0 m m (3.543 3 -3.543 7 in )
Servic e Limit : 90.0 7 m m (3.54 6 in )
Oversize (A/T):
0.25: 90.2 5 - 90.2 6 m m (3.55 3 - 3.55 4 in )
0.50 : 90.5 0 - 90.5 1 m m (3.56 3 - 3.56 3 in ) Bor
e Tape r
Limit : (Differenc e betwee n firs t an d thir d measure -
ment ) 0.0 5 m m (0.00 2 in )
• I f measurement s i n an y cylinde r ar e beyon d
Oversize Bor e Servic e Limit , replac e th e block .
• I f bloc k i s t o b e rebored , refe r t o Pisto n Clear -
anc e Inspectio n (se e pag e 7-13 ) afte r reboring .
NOTE : Score d o r scratche d cylinde r bore s mus t b e
honed .
Reborin g Limi t (A/T) : 0.5 0 m m (0.02 0 in )
2 . Chec k th e to p o f th e bloc k fo r warpage .
Measur e alon g th e edge s an d acros s th e cente r a s
shown .
SURFACE S T O B E MEASURE D
Engine Bloc k Warpage :
Standar d (New) : 0.0 7 m m (0.00 3 in ) max .
Servic e Limit : 0.1 0 m m (0.00 4 in )
PRECISIO N STRAIGH T EDG E
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Connecting Rods

Selection

Each rod is sorted into one of four tolerance ranges

(from O to 0.024 mm, in 0.006 mm increments) depen-

ding on the size of its big end bore. It's then stamped

with a number (1, 2, 3 or 4) indicating that tolerance.

You may find any combination of 1, 2, 3 or 4 in any

engine.

Normal Bore Size: 55 mm (2.17 in)

NOTE:

• Reference numbers are for big end bore size and

do NOT indicate the position of the rod in the

engine.

• Inspect each connecting rod for cracks and heat

damage.ProCarManuals.com

Piston Ring s
End Ga p
1. Usin g a piston , pus h a ne w rin g int o th e cylinde r
bore 15-2 0 m m (0. 6 - 0. 8 in ) fro m th e bottom .
2 . Measur e th e pisto n rin g end-ga p wit h a feele r
gauge :
• I f th e ga p i s to o small , chec k t o se e i f yo u hav e
th e prope r ring s fo r you r engine .
• I f th e ga p i s to o large , rechec k th e cylinde r bor e
diamete r agains t th e wea r limit s o n pag e 7-12 . I f
th e bor e i s ove r limit , th e cylinde r bloc k mus t b e
rebored .
Pisto n Rin g End-Gap :
To p Rin g
M/T:
Standar d (New) :
Servic e Limit :
A/T:
Standar d (New) :
Servic e Limit :
Secon d Rin g
Standar d (New) :
Servic e Limit :
Oi l Rin g
Standar d (New) :
Servic e Limit :
0.20 - 0.3 0 mm
(0.008-0.01 2 in )
0.5 0 m m (0.02 0 in )
0.2 5 - 0.4 0 mm
(0.010-0.01 6 in )
0.6 0 m m (0.02 4 in )
0.3 5 - 0.5 0 mm
(0.014-0.02 0 in )
0.75 mm (0.0 3 in)
0.2 0 - 0.7 0 mm
(0.00 8 - 0.02 8 in )
0.8 0 m m (0.03 1 in )
Replacemen t
1. Usin g a rin g expander , remov e th e ol d pisto n rings .
2. Clea n al l rin g groove s thoroughly .
NOTE:
• Us e a squared-of f broke n rin g o r rin g groov e
cleane r wit h blad e t o fi t pisto n grooves .
• To p an d 2n d rin g groove s ar e 1. 2 m m (0.0 5 in )
wid e an d th e oi l rin g groov e i s M/T : 2. 5 m m (0.1 0
in) , A/T : 2. 8 m m (0.1 1 in ) wide .
• Fil e dow n th e blad e i f necessary .
CAUTION : D o no t us e a wir e brus h to clea n th e rin g
grooves , o r cu t rin g groove s deepe r wit h a cleanin g
tool .
3 . Instal l ne w ring s i n th e prope r sequenc e an d posi -
tio n (se e pag e 7-16 ).
NOTE : D o no t reus e ol d pisto n rings .
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Crankshaft

Installation

Before installing the crankshaft, apply a coat of

engine oil to the main bearings and rod bear-

ings.

1. Insert bearing halves in the engine block and con-

necting rods.

2. Lower the crankshaft into the block.

THRUST WASHERS

Grooved sides face outward.

3. Install the thrust washers on the No. 3 journal. Oil

thrust washer surfaces.

4. Install the bearings and caps. Tighten 9 x 1.25 mm

cap bolts to the specified torque.

Torque: 39 N-m (4.0 kgf-m, 29 Ibf-ft)

TIMING BELT

PULLEY SIDE

JOURNAL NUMBERS
NOTE:

• Guide the piston carefully to prevent damage.

• Fit long rubber hoses (about 30 cm long) to con-

necting rod bolts to protect the crankshaft.

• Install the pistons after setting the crankshaft to

BDC for each cylinder.

CORRECT

INCORRECT

RUBBER HOSES

8 x
0.75
mm

20 N-m (2.0 kgf-m, 14 Ibf-ft)

after turn to 116°

MARK

• Line up the marks when installing connecting

rod
cap.
BEARING CAP

WASHERS

BEARING CAPSProCarManuals.com

Crankshaft
Installation (cont'd )
5. Chec k th e ro d bearin g clearanc e wit h plastigag e
(se e pag e 7-7 ), the n torqu e th e connectin g ro d ca p
nuts .
NOTE : Referenc e number s o n connectin g rod s ar e fo r
big-en d bor e toleranc e an d d o NO T indicat e th e posi -
tio n o f pisto n i n engine .
CONNECTIN G RO D CA P NU T TORQUIN G
METHO D
1 ) Torqu e th e connectin g ro d ca p nu t t o 2 0 N- m
(2. 0 kgf-m , 1 4 Ibf-ft ) wit h a beam-typ e torqu e
wrench .
2 ) Instal l a torqu e angl e gaug e t o th e ca p nut , the n
tur n th e ca p nu t 11 6 degrees .
Snap-onTA360 o requivalen t
BEARING CAP BOLTS TORQUE SEQUENCE
6 . Instal l th e bearin g ca p bridge , an d tighte n 1 1 x 1. 5
m m bolt s t o th e specifie d torqu e diagonall y out -
war d fro m th e center .
Torque : 6 5 N- m (6. 6 kgf-m , 4 8 Ibf-ft )
7 . Tighte n ca p sid e bolt s (1 0 x 1.2 5 mm ) t o th e
specifie d torque .
Torque : 4 9 N- m (5. 0 kgf-m , 3 6 Ibf-ft )
• Coa t th e bol t threa d an d sea t surfac e wit h
engin e oil .
NOTE : Th e shorte r sid e bolt s ar e fo r th e fron t side .
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BEARING CA P
BRIDG E
CAP BRIDG E BOL T
11 x 1. 5 m m65 N- m (6. 6 kgf-m ,
4 8 Ibf-ft )
SID E BOL T
10 x 1.2 5 m m49 N- m (5. 0 kgf-m ,
3 6 Ibf-ft ) CA
P BOL T
9 x 1.2 5 mm39 N- m (4. 0 kgf-m ,
2 9 Ibf-ft )
8. Appl y liqui d gaske t t o th e bloc k matin g surfac e o f
the lef t sid e cove r an d oi l pum p case , an d instal l
them o n th e engine block.
NOTE : Th e sea l surfac e o n th e bloc k shoul d b e
dry . Appl y a ligh t coa t o f oi l t o th e crankshaf t an d
t o th e li p o f seal .
LEF T SIDE :
Apply liqui dgaske t t o bloc kmatin g surface .
LEFT SID E COVE R
SPECIA L BOLT S6 x 1. 0 m m12 N- m (1. 2 kgf-m ,8.7 Ibf-ft )Replace .
OIL PUM P SIDE :
6 x 1. 0 m m12 N- m (1. 2 kgf-m , 8. 7 Ibf-ft )
BAFFL E PLAT E OI
L SCREE N
6 x 1. 0 m m12 N- m (1. 2 kgf-m ,
8. 7 Ibf-ft )
OI L PAS S
PIPE
OIL PUM PApply liqui dgaske t t o bloc k
matin g surfaces .
NOTE:
SPECIA L BOLT S6 x 1. 0 m m12 N- m (1. 2 kgf-m ,
8. 7 Ibf-ft )
Replace .
SPECIAL BOLT S8 x 1.2 5 mm22 N- m (2. 2 kgf-m ,16 Ibf-ft )
Replace .
• Us e liqui d gasket . Par t No . 0871 8-000 1 o r 0871 8
- 0003 .
• Chec k tha t th e matin g surface s ar e clea n an d
dry befor e applyin g liqui d gasket .
• Appl y liqui d gaske t evenly , bein g carefu l t o cove r
all o f th e matin g surface .
• T o preven t leakag e o f oil , appl y liqui d gaske t t o
th e inne r thread s o f th e bol t holes .
DOWE L PI N
DOWE L PI N
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