1991 ACURA NSX Service Repair Manual

Crankshaft
Installation
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 .
Torqu e 6 6 N- m (6. 6 kg-m , 4 8 Ib-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 : 5 0 N- m (5. 0 kg-m , 3 6 Ib-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 .
BEARIN G CA PBRIDG ECAP BRIDG E BOL T11 x 1. 5 m m66 N- m (6. 6 kg-m ,48 Ib-ft )
SID E BOL T
10 x 1.2 5 mm50 N- m (5. 0 kg-m ,36 Ib-ft ) CA
P BOL T9 x 1.2 5 mm40 N- m (4. 0 kg-m ,29 Ib-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 engin e 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
to 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 S
6 x 1. 0 m m12 N- m (1. 2 kg-m ,9 Ib-ft )
Replace . DOWE
L PI N
BEARIN G CA P BOLT S TORQU E SEQUENC E
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6 x 1. 0 m m12 N- m (1. 2 kg-m ,9 Ib-ft )
OIL PUM P
Appl y liqui d
gaske t t o bloc kmatin g surfaces .
SPECIAL BOLT S6 x 1. 0 m m12 N- m (1. 2 kg-m ,9 Ib-ft )Replace .
SPECIAL BOLT S8 x 1.2 5 mm22 N- m (2. 2 kg-m ,16 Ib-ft )Replace .
NOTE:
• Use liqui d gasket , Par t No. 08718-0001 .
• 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
al l 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 of the bol t holes .
LEFTSIDE COVE R
Apply liqui d gaske talong th e broke n line .
OIL PUM PApply liqui d gaske talong th e broke n line .
• D o no t instal l th e part s i f fiv e minute s o r mor e
have elapse d sinc e applyin g liqui d gasket .
Instead reappl y liqui d gaske t afte r removin g ol d
residue .
• Afte r assembly , wai t a t leas t 2 0 minute s befor e
filling th e engin e wit h oil .
9. Instal l th e oi l pas s pip e an d joint .
10 . Instal l th e baffl e plate .
11 . Instal l th e oi l screen .
12 . Instal l th e oi l pa n (se e pag e 8-10 ).
CAUTION : Wheneve r an y crankshaf t o r connec -
tin g ro d bearin g i s replaced , afte r reassembly , ru n
th e engin e a t idlin g spee d unti l i t reache s norma l
operatin g temperature , the n continu e t o ru n fo r ap -
proximatel y 1 5 minutes .
OIL PUM P SIDE :
6 x 1. 0 m m12 N- m (1. 2 kg-m , 9 Ib-ft )
OIL SCREE NBAFFLE PLAT E
OIL PAS SPIPE
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Special Tool s
8-9
8-5
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Engine Lubricatio n
Illustrated Inde x
FRON T CYLINDE RHEADENGIN E OI L PRESSUR E GAUG ESENDIN G UNI T22 N- m (2. 2 kg-m . 1 6 Ib-ft )
NOTE :
• Us e ne w O-ring s whe n reassembling .
• Appl y oi l t o O-ring s befor e installation .
• Us e liqui d gasket , Par t No . 08718-0001 .
• I f th e botto m o f th e oi l pa n is deformed , i t shoul d b e
repaire d o r th e oi l pa n shoul d b e replace d t o retai n
prope r clearanc e betwee n th e scree n an d th e
bottom .
OIL CONTRO L ORIFIC ERemove wit h 6 m mbol t an d clean .
O-RIN GReplace .
8 x 1.2 5 mm22 N- m (2. 2 kg- m16 Ib-ft )Replace .
ENGINE OI LPRESSUR ESWITCH
OIL FILTE R BAS EIllustrate d Index ,page 8-1 2
OIL PUM PIllustrate d index , pag e 8- 7Inspection , pag e 8 -8Appl y liqui d gaske t t omatin g surfac e o f engin e block .
OIL PA N GASKE T
Replace .
OIL PA N• D o no t defor mthe bottom .Refer t o pag e 8-1 0whe n installing .
OIL FILTE ROne tur n o r22 N- m (2. 2 kg-m ,16 Ib-ft )Replacemen t 8- 5
6 x 1. 0 m m12 N- m(1.2 kg-m , 9 Ib-ft )
6 x 1. 0 m m12 N- m(1.2 kg-m , 9 Ib-ft )
DRAI N PLU G
20 x 1. 5 m m45 N- m (4. 5 kg-m , 3 3 Ib-ft )
6 x 1. 0 m m14 N- m (1. 4 kg-m , 1 0 Ib-ft )
ENGIN E OI LCOOLE R
WATE
R PAS S PIP E
DOWEL PIN S
SPECIA L BOLT S
8 x 1.2 5 mm22 N- m (2. 2 kg-m ,16 Ib-ft ) O-RING S
Replace . Replace .
OI L PAS S
PIPE
SPECIA L BOLT S6 x 1. 0 m m12 N- m(1.2 kg-m , 9 Ib-ft )
Replace .
6 x 1. 0 m m12 N- m (1. 2 kg-m , 9 Ib-ft )
DOWE
L PI N O-RING
S
Replace .
8 x 1.2 5 mm12 N- m (2. 2 kg-m ,16 Ib-ft )
OILSCREE N
WASHE R
Replace .
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Engine Oil

Inspection

1. Check engine oil with the engine off and the car

parked on level ground.

2. Make certain that the oil level indicated on the

dipstick is between the upper and lower marks.

3. If the level has dropped close to the lower mark,

add oil until it reaches the upper mark.

CAUTION: Insert the dipstick carefully to avoid

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Oil Filte r
Replacemen t
CAUTION: Loose n th e oi l filte r carefull y whil e th e
engin e is hot , th e ho t oi l ma y caus e scalding .
1 . Remov e th e oi l filte r wit h th e specia l too l a s shown .
2 . Inspec t th e thread s an d rubbe r sea l o n th e ne w filter .
Wip e of f th e sea t o n oi l filte r base , the n appl y a ligh t
coa t o f oi l t o th e rubbe r sea l an d instal l th e filter .
3 . Afte r th e rubbe r sea l i s seate d agains t th e base ,
tighte n th e oi l filte r b y turnin g i t approximatel y on e
turn .
Torque : On e tur n (2 2 N- m (2. 2 kg-m , 1 6 lb-ft)) .
OIL FILTE R WRENC H
0791 2-611000 1
Torque : On e tur n
(2 2 N- m (2. 2 kg-m , 1 6 lb-ft) )
4. Star t th e engine , an d chec k th e filte r fo r oi l leakage .
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Oil Pressur e
Testing
If th e oi l pressur e warnin g ligh t stay s o n wit h th e engin e
running , chec k th e engin e oi l level . I f th e oi l leve l i s
correct :
1 . Remov e th e engin e oi l pressur e switch , an d instal l
a n oi l pressur e gauge .
2. Star t th e engine . Shu t i t of f immediatel y i f th e
gaug e register s n o oi l pressure . Repai r th e proble m
befor e continuing .
3 . Allo w th e engin e t o reac h operatin g temperatur e
(fa n come s o n a t leas t twice) . Th e pressur e shoul d
be:
Engin e Oi l Pressure :
A t Idle : 7 0 kP a (0. 7 kg/cm2, 1 0 psi )
minimu m
At 3,00 0 rpm : 35 0 kP a (3. 5 kg/cm2, 5 0 psi )
minimu m
• I f oi l pressur e i s
within specifications , replac e th e
oi l pressur e sende r an d recheck .
• I f oi l pressur e i s NO T withi n specifications , inspec t
th e oi l pum p (se e pag e 8-8) .
ENGIN E OI L PRESSUR ESWITCHMOUNTIN G HOL E
OIL PRESSUR E GAUG E ADAPTO R
(1/8 " - 28 , BSPT )
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Oil Pum p
Overhau l
NOTE:
• Us e ne w O-ring s whe n reassembling .
• Appl y oi l t o O-ring s befor e installation .
6 x 1. 0 m m6 N- m (0. 6 kg-m . 4 Ib-ft ) PUM
P COVE RInspection , pag e 8-8 , 8-9PUM P HOUSIN G
Inspection , pag e 8-8 , 8-9
OI L SEA LInstallation , pag e 8- 9Replace .
OUTER ROTO RInspection , pag e 8-8 , 8-9
SEALIN G BOL T 1 8 m m
5 0 N- m (5. 0 kg-m , 3 6 Ib-ft )
RELIE F VALV EValve mus t slid e freel y
i n housin g bore .
I f valv e i s scored ,
replac e it .
O-RIN GReplace .
SEALING BOL T 2 0 m m
4 0 N- m (4. 0 kg-m , 2 9 Ib-ft )
INNE
R ROTO R
Inspection , pag e 8-8 , 8-9
WASHE R
Replace .
VALV E SPRIN G
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