1997 ACURA NSX Service Repair Manual

Piston Rings

Ring-to-Groove Clearances

After installing a new set of rings, measure ring-to-groove

clearances:

Top Ring Clearance

M/T:

Standard (New): 0.035 - 0.065 mm

(0.0014-0.0026 in)

Service Limit: 0.13 mm (0.005 in)

A/T:

Standard (New): 0.030 - 0.055 mm

(0.0012 - 0.0022 in)

Service Limit: 0.13 mm (0.005 in)

Second Ring Clearance

M/T:

Standard (New): 0.030 - 0.060 mm

(0.0012-0.0024 in)

Service Limit: 0.13 mm (0.005 in)

A/T:

Standard (New): 0.030 - 0.055 mm

(0.0012-0.0022 in)

Service Limit: 0.13 mm (0.005 in)ProCarManuals.com

Alignment
1. Instal l th e ring s a s shown .
NOTE:
• Th e to p rin g ha s a n R 1 o r R mark .
• Th e secon d rin g ha s a n R 2 o r R N mark .
NOTE : Th e manufacturin g mark s mus t b e facin g
upward .
Piston Ring s
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2. Rotate the rings in their grooves to make sure they

do not bind.

3. Position the ring end gaps as shown:ProCarManuals.com

Piston/Connecting
Rod Assemblie s
Installation
Before installin g th e piston , appl y a coa t o f
engin e oi l t o th e rin g groove s an d cylinde r
bores.
1. I f th e crankshaf t i s alread y installed :
• Guid e th e pisto n carefull y t o preven t damage .
• Fi t lon g rubbe r hose s (abou t 3 0 c m (1 2 in ) long ) t o
th e connectin g ro d bolt s t o protec t th e crankshaft .
• Instal l th e piston s afte r settin g th e crankshaf t t o
BD C fo r eac h cylinder .
• Instal l th e pisto n assemblie s i n No . 1 an d No . 4
cylinders . No . 2 an d No . 5 cylinders , an d No . 3
an d No . 6 cylinders .
• Instal l th e rin g compressor , chec k tha t th e bear -
in g i s securel y i n place ; the n positio n th e pisto n
i n th e cylinde r an d ta p i t i n usin g th e woode n
handl e o f a hammer .
• Sto p afte r th e rin g compresso r pop s fre e an d
chec k th e connectin g rod-to-cran k journa l align -
men t befor e puttin g ro d int o place .
• Instal l th e ro d cap s wit h bearings , an d torqu e th e
nut s t o 2 0 N- m (2. 0 kgf-m , 1 4 Ibf-ft) , the n tur n th e
nu t 11 6 degree s (se e pag e 7-20 ).
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Piston/Connecting Ro d
Assemblie s
Installation (cont'd )
2. I f th e crankshaf t i s no t installed :
• Remov e th e ro d cap s an d bearings , instal l th e
rin g compressor , the n positio n th e pisto n i n th e
cylinde r an d ta p it i n usin g th e woode n handl e o f
a hammer.
NOTE : Maintai n downwar d forc e o n th e rin g com -
presso r t o preven t ring s fro m expandin g befor e
enterin g th e cylinde r bore .
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NOTE: Refe r t o pag e 8- 9 fo r installatio n o f th e oi l
pum p sid e oi l seal .
2
. Confir m clearanc e i s equa l al l th e wa y aroun d wit h
a feele r gauge .
DRIVERATTACHMEN T07948-SB0010 1
1. Usin g th e specia l tools , driv e i n th e flywheel-en d sea l
unti l th e drive r bottom s agains t lef t sid e cover .
DRIVE R07749-001000 0
The 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 th e seal .
Oil Sea l
Installatio n
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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

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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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