1991 ACURA NSX Service Repair Manual

Compressor

Clutch Overhaul

1. Remove the center bolt while holding the pressure

plate.

CENTER BOLT

12 N-m (1.2 kg-m, 9 Ib-ft)

A/C CLUTCH HOLDER

Commercially available

Robinair: P/N 10204

Kent-Moore: P/N J37872

2. Remove the pressure plate and shim(s), taking care

not to lose the shims.

PRESSURE

PLATE

SHIM(S)
3. Use snap ring pliers to remove snap ring B, then

remove the pulley.

NOTE:

• Be careful not to damage the pulley and com-

pressor during removal/installation.

• Once the snap ring B was removed, replace it

with a new one.

SNAP RING B

Replace.

PULLEYProCarManuals.com

4. Remove the snap ring A and the field coil.

NOTE:

• Be careful not to damage the field coil and com-

pressor during removal/installation.

• Once the snap ring A was removed, replace it

with a new one.

5. Install parts in the reverse order of removal, and:

• Install the field coil with the wire side facing

down (see above).

• Clean the pulley and compressor sliding surfaces

with non-petroleum solvent.

• Check the pulley bearings for excessive play.

• Make sure the snap rings are in the groove

properly.

• Apply locking agent to the threads on the center

bolt.

• Make sure that the pulley turns smoothly after it's

reassembled.ProCarManuals.com

Relief Valve Replacement

1. Remove the relief valve and O-ring.

Don't let any refrigerant oil run out.

NOTE: Be sure to use the right O-rings for R-134a.

2. Clean off the mating surface.

3. Replace O-ring with new one at the relief valve, and

apply refrigerant oil (ND-OIL 8) to it.

NOTE:

• Do not return the oil to the container once

dispensed and never mix with other refrigerant

oils to avoid contamination.

• Immediately after using the oil, replace the cap

on the container and seal it to avoid moisture

absorption.

• Do not spill the refrigerant oil on the car; it may

damage the paint; if the refrigerant oil contacts

the paint, wash it off immediately.

4. Install and tighten the relief valve.

5. Charge the system and check for leaks, then push

the cap into the valve.ProCarManuals.com

Belt Adjustmen t
Deflection Metho d
1 . Appl y a forc e o f 10 0 N (1 0 kg , 2 2 Ib ) an d measur e
th e deflectio n betwee n th e A/ C compresso r an d th e
crankshaf t pulley .
A/ C Compresso r Bel t
Use d Belt :
10-1 2 mm (0.39-0.4 7 in)
Ne w Belt : 5.5-7. 5 mm (0.22-0.3 0 in)
NOTE :
• I f ther e ar e crack s o r an y damag e eviden t o n th e
belt , replac e it wit h a ne w one .
• "Use d belt " mean s a bel t whic h ha s bee n use d
fo r fiv e minute s o r more .
• "Ne w belt " mean s a bel t whic h ha s bee n use d
fo r les s tha n fiv e minutes .
2 . Loose n th e adjustin g pulle y nu t an d th e adjustin g
bolt.
3. Tur n th e adjustin g bol t t o ge t prope r bel t tension ,
the n retighte n th e adjustin g pulle y nut .
4 . Rechec k th e deflectio n o f th e A/ C compresso r belt .
ADJUSTIN G BOL T12 N- m (1. 2 kg-m , 9 Ib-ft )
COMPRESSO RBELTIDLE R PULLE Y CENTE R NU T45 N- m (4. 5 kg-m , 3 3 Ib-ft )
Tensio n Gaug e Metho d
1 . Attac h th e bel t tensio n gaug e t o th e A/ C compres -
so r bel t a s show n below , an d measur e th e tensio n
of th e belt .
A/C Compresso r Bel t
Use d Belt :
350-55 0 N (35-55 kg. 77-12 1 Ib)
New Belt : 700-90 0 N (70-90 kg,
154-19 8 Ib )
NOTE :
• I f ther e ar e crack s o r an y damag e eviden t o n th e
belt , replac e it wit h a ne w one .
• Follo w th e manufacturer' s instruction s fo r th e
bel t tensio n gauge .
• "Use d belt " mean s a bel t whic h ha s bee n use d
fo r fiv e minute s o r more .
• "Ne w belt " mean s a bel t whic h ha s bee n use d
fo r les s tha n fiv e minutes .
2 . Loose n th e adjustin g pulley nut an d th e adjustin g
bolt.
3. Tur n th e adjustin g bol t t o ge t prope r bel t tension ,
the n retighte n th e adjustin g pulle y nut .
4 . Rechec k th e tensio n o f th e A/ C compresso r belt .
BEL T TENSIO N GAUG E07JGG - 001010 A
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A/C System Service

Evacuation

Only use service equipment that is U.L.-listed and is cer-

tified to meet the requirements of SAE J2210 to remove

HFC-134a (R-134a) from the air conditioning system.

CAUTION: Exposure to air conditioner refrigerant

and lubricant vapor or mist can irritate eyes, nose

and throat. Avoid breathing the air conditioner

refrigerant and lubricant vapor or mist.

If accidental system discharge occurs, ventilate work

area before resuming service.

R-134a service equipment or vehicle air conditioning sys-

tem should not be pressure tested or leak tested with

compressed air.

Some mixtures of air and R-134a have

been shown to be combustible at elevated pressures

and can result in fire or explosion causing injury or

property damage. Never use compressed air to pres-

sure test R-134a service equipment or vehicle air

conditioning systems.

Additional health and safety information may be obtained

from the refrigerant and lubricant manufacturers.

1. When an A/C System has been opened to the at-

mosphere, such as during installation or repair, it

must be evacuated using a R-134a refrigerant

Recovery/Recycling/Charging System. (If the

system has been open for several days, the

receiver/dryer should be replaced).

2. Connect a R-134a refrigerant Recovery/Recycl-

ing/Charging System to the car as shown follow

the equipment manufacturer's instructions.

NOTE: If low pressure does not reach more than

700 mm Hg (27 in-Hg) in 1 5 minutes, there is pro-

bably a leak in the system. Partially charge the

system and check for leaks (see Leak Test).
Recovery/Recycling/Charging SystemProCarManuals.com

A/C Syste m Servic e
Leak Tes t
Only us e servic e equipmen t tha t i s U.L.-liste d an d is cer -
tified to mee t th e requirement s o f SA E J221 0 to remov e
HFC-134 a (R-134a ) fro m th e ai r conditionin g system .
CAUTION : Exposur e t o ai r conditione r refrigeran t
an d lubrican t vapo r o r mis t ca n irritat e eyes , nos e
an d throat . Avoi d breathin g th e ai r conditione r
refrigeran t an d lubrican t vapo r o r mist .
I f accidenta l syste m discharg e occurs , ventilat e wor k
are a befor e resumin g service .
R-134 a servic e equipmen t o r vehicl e ai r conditionin g sys -
te m shoul d no t b e pressur e teste d o r lea k teste d wit h
compresse d air .
Som e mixture s o f ai r an d R-134 a hav e
bee n show n to b e combustibl e a t elevate d pressure s
an d ca n resul t i n fir e o r explosio n causin g injur y o r
propert y damage . Neve r us e compresse d ai r t o pres -
sur e tes t R-134 a servic e equipmen t o r vehicl e ai r
conditione r systems.
Additiona l healt h an d safet y informatio n ma y b e obtaine d
fro m th e refrigeran t an d lubrican t manufacturers .
1 . Connec t a R-134 a refrigeran t Recovery/Recycl -
ing/Charging Syste m to th e ca r a s show n followin g
the equipmen t manufacturer' s instructions .
NOTE: B e sur e t o instal l th e sam e amoun t o f ne w
refrigeran t oi l bac k int o th e A/ C syste m befor e
charging .
2 . Ope n hig h pressur e valv e t o charg e th e syste m to
abou t 10 0 kP a (1. 0 kg/cm2, 1 4 psi) , the n clos e th e
suppl y valve .
3 . Chec k th e syste m fo r leak s usin g a R-134 a
refrigeran t lea k detecto r wit h a n accurac y o f
0.5/oz . pe r yea r o r better .
4 . I f yo u fin d leak s tha t requir e th e syste m to b e open -
e d (t o repai r o r replac e houses , fittings , etc.) ,
recove r th e syste m accordin g t o th e Recove r Pro -
cedur e o n pag e 22-73 ).
5 . Afte r checkin g an d repairin g leaks , th e syste m
mus t b e evacuate d (se e Syste m Evacuatio n o n
pag e 22-89 ).
Recovery/Recycling/Chargin g Syste m
ProCarManuals.com

Charging
Only us e servic e equipmen t tha t i s U.L.-liste d an d i s
certifie d t o mee t th e requirement s o f SA E J221 0 t o
remov e HFC-134 a (R-134a ) fro m th e ai r conditione r
system .
CAUTION : Exposur e t o ai r conditione r refrigeran t
an d lubrican t vapo r o r mis t ca n irritat e eyes , nos e
an d throat .
Avoi d breathin g th e ai r conditione r refrigeran t an d
lubrican t vapo r o r mist .
I f accidenta l syste m discharg e occurs , ventilat e wor k
are a befor e resumin g service . Additiona l healt h an d safe -
t y informatio n ma y b e obtaine d fro m th e refrigeran t an d
lubrican t manufacturers .
Refrigeran t capacity : 800-85 0 g (28-3 0 oz )
CAUTION : D o no t overcharg e th e system ; th e
compresso r wil l b e damaged .
Connec t a R-134 a refrigeran t Recovery/Recycl -
ing/Chargin g Syste m to th e ca r a s show n follo w th e
equipmen t manufacturer' s instructions .
Recovery/Recycling/Chargin g Syste m
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Special Tools

Ref.
No.

Tool Number
07JAA — 001000C

07JGG — 001010A

07LAJ — PT3020A

07LAZ— SL40300

07PAZ — 0010100
Description
Antenna Nut Wrench Bait Tension Gauge
Test Harness
Test Harness C
SCS Service Connector
Qty

1

1
1
1
1
Page Reference

23-242, 244
23-109
23-132('94-'96) ('91-'93)
23-250, 307('93-'96) ('91-'92)
23-91
('94-'96) ('91-'93)
*: Included in SRS Tool Set 07MAZ - SM5000B
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