1991 ACURA NSX Service Repair Manual

Pressure Plate , Clutc h Disc , Mi d Plat e
Remova l
1. Instal l th e specia l tools .
RING GEA R HOLDE R07LAB - PV0010 0 o r0792 4 - PD2000 3
ADJUSTE RNUT
ADJUSTE R
BOL T
BOL T ENGIN
EBLOCK
NUT
WASHE R
2. T o preven t warping , unscre w th e pressur e plat e
mountin g bolt s i n a crisscros s patter n i n severa l
steps , the n remov e th e pressur e plat e an d th e 1s t
clutc h disc .
3. Remov e th e releas e bearin g fro m th e pressur e
plate .
MOUNTIN G BOL T
1ST CLUTC H DIS C
RELEAS E BEARIN G
PRESSUR E PLAT E
4. Remov e th e mi d plat e an d th e 2n d clutc h disc .
FLYWHEE L
2N D CLUTC H DIS C
MI D PLAT E
5. Remov e th e sprin g colla r an d dampe r washe r fro m
th e flywheel .
FLYWHEE L
SPRIN G
COLLA R
DAMPER WASHE R
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Pressure Plate

Inspection

NOTE: If replacement is required, always replace the

pressure plate, mid plate, and flywheel as a set.

1. Inspect the pressure plate surface for wear, cracks,

and burning.

2. Inspect the fingers of the diaphragm spring for

wear at the release bearing contact area.

3. Inspect for warpage using a straight edge and

feeler gauge.

NOTE: Measure across the pressure plate at three

points.

Standard (New): 0.03 mm (0.001 in) max.

Service Limit: 0.15 mm (0.006 in)

STRAIGHT EDGE

FEELER GAUGE

PRESSURE PLATE

If the warpage is more than the service limit, replace

the pressure plate.
Release Bearing

Inspection

1. Check the release bearing for excessive play by

spinning it by hand.

CAUTION: Do not wash the release bearing in

solvent.

2. Replace the release bearing with a new one if there

is excessive play.
RELEASE

BEARINGProCarManuals.com

1st and 2nd Clutch Discs

Inspection

1. Inspect the lining of the clutch disc for signs of slip-

ping or oil. Replace it if it is burned black or oil

soaked.

2. Measure the clutch disc thickness.

Standard:

1st
Clutch Disc:
8.3-9.0
mm

(0.33-0.35
in)

2nd
Clutch Disc:
7.6-8.3
mm

(0.30-0.33
in)

Service Limit:

1st Clutch Disc: 5.9 mm (0.23 in)

2nd Clutch Disc: 5.4 mm (0.21 in)

CLUTCH DISC

If the thickness is less than the service limit, replace

the clutch disc.
3. Measure the depth from the lining surface to the

rivets, on both sides.

1st and 2nd Clutch Discs:

Standard: 1.1 mm (0.04 in) min.

Service Limit: 0.2 mm (0.01 in)

CLUTCH DISC

If the rivet depth is less than the service limit, replace

the clutch disc.ProCarManuals.com

Mid Plate

Inspection

NOTE: If replacement is required, always replace the

pressure plate, mid plate, and flywheel as a set.

1. Inspect the mid plate surface for wear, cracks, and
burning.

2. Inspect for warpage using a straight edge andfeeler gauge.
NOTE: Measure across the mid plate at three points.
Standard: (New): 0.05 mm (0.002 in) max.

Service Limit: 0.15 mm (0.006 in)

STRAIGHT EDGE
MID PLATE

FEELERGAUGE

If the warpage is more than the service limit, replace
the mid plate.

After Pressing:
MID PLATE GUIDE

Before Pressing:
MID PLATE

The mid plate guides are the self-adjusting mechanisms

for the mid plate.

NOTE: Make sure all parts are clean before inspection.
Check the mid plate guides by pushing down on each of
the guides by hand (10–60 kg). The mid plate guides
should compress and lock in place.
If the mid plate guides do not move or compress, disas-
semble the mid plate guides and inspect them for debris,
wear and damage. Refer to page 12-15
('93-'96), 12-17

('91-'92 Models).

Inspection

Mid Plate GuideProCarManuals.com

Mid Plat e Guid e
Initializatio n
NOTE:
• I f th e pressur e plat e mountin g bolt s ar e unscrewed ,
th e mi d plat e guid e mus t b e initialized .
• Initializ e afte r tightenin g th e pressur e plat e moun t
bolts.
1. Scre w th e 5 m m bol t int o th e bac k o f th e flywhee l
unti l i t jus t touche s th e mi d plat e guide .
5 x 0. 8 m m BOL T
Lengt h o f thread s
10 m m (0.3 9 in)1.5 N- m (0.1 5 kg-m ,1.1 Ib-ft )
MI D PLAT E
MID PLAT E GUID E
5 x 0. 8 m mBOL T
2. Scre w th e 5 m m bol t i n 1 50 — 210 ° further .
3. Mak e sur e that :
• Th e mi d plat e guid e touche s th e bac k o f th e mi d
plat e
• Ther e is 0.25-0.4 0 mm (0.010-0.01 6 in)
clearanc e betwee n th e mi d plat e guid e an d th e
fron t o f th e mi d plat e
4 . Initializ e th e remainin g mi d plat e guide s a s describ -
e d above , the n remov e th e 5 m m bolt .
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Replacement

NOTE: Make sure all parts are clean before installation.

1. Thread and tighten a 4 mm screw into mid plate

guide.

MID

PLATE

GUIDE
4 x 0.7 mm SCREW

Length of threads

30 mm
(1.18
in)

2. Remove the guide collar, spring and washer.

GUIDE COLLAR

SCREW

MID PLATE GUIDE
3. Remove the mid plate guide with the screw

installed.

MID PLATE GUIDE

SCREW

4. Thread and tighten a 4 mm screw into the new mid

plate guide, then remove the mid plate guide from

the guide collar.

4 x 0.7 mm SCREW

Length of threads

30 mm
(1.18
in)

GUIDE COLLAR

MID PLATE GUIDE

SPRING

WASHERProCarManuals.com

Mid Plat e Guid e
Replacemen t (cont'd )
5. Instal l th e ne w mi d plat e guid e wit h th e scre w
installed .
-MID PLAT E GUID EInstall a s shown .
7. Initializ e th e mi d plat e guide s afte r installin g th e
clutc h assembl y (se e pag e 12-14 ).
12-1 6
6. Instal l th e washer , sprin g an d guid e collar , the n
remov e th e screw .
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Mid Plate Guide
Replacement (cont'd)

5. Install the new mid plate guide with the screw
installed.

MII D PLATE GUIDE
SCREW
MI D PLATE

6. Install the washer, spring and guide collar, then
remove the screw.

GUIDE COLLAR

SCREW SPRI
NG

WASHER
MID PLATE GUIDE

Install as shown.

7. Initialize the mid plate guides after installing the
clutch assembly (see page 12-14)

assembly Flywheel, Flywheel Bearing
Inspection
NOTE: If replacement is required, always replace the

pressure plate, mid plate, and flywheel as a set.
1. Inspect the ring gear teeth for wear and damage.
2. Inspect the clutch disc mating surface on the
flywheel for wear, cracks, and burning.

3. Measure the flywheel runout using a dial indicator through at least two full turns. Push against the
flywheel esch time you turn it to take up the
crankshaft thrust washer clearance.

NOTE: The runout can be measured with engine

installed.

Standard (New): 0.05 mm (0.002 in) max.

Service Limit: 0.15 mm (0.006 in)

If the runout exceeds the service limit, replace the
flywheel.

RING

GEAR

FLYWHEEL

4. Turn the inner race of the ball bearing with your
finger. The bearing should turn smoothly and quiet-

ly. Check that the bearing outer race fits tightly in
the flywheel. Replace the bearing if the race does

not turn smoothly, quietly, or fit tightly in the

flywheel.

BALL
BEARING

FLYWHEELProCarManuals.com