ACURA NSX 1991 Service Repair Manual

SCREWDRIVER
ONE-WAY CLUTCH
3. After the parts are assembled, hold countershaft

1 st gear and turn the parking gear in the direction

shown to be sure it turns freely.
COUNTERSHAFT

1ST GEAR

Inspect for wear or scoring.
ONE-WAY CLUTCH

Inspect for damage or faulty movement.
NEEDLE ROLLER BEARINGS

Inspect for galling and rough movement.
1ST GEAR COLLAR
RETAINER PLATE

Inspect for wear or scoring.

ONE-WAY CLUTCH

NOTE: Install in this

direction.

COUNTERSHAFT

1ST GEAR
2. Remove the one-way clutch by prying it up with the

end of a screwdriver.
COUNTERSHAFT

1ST GEAR
PARKING GEAR

Inspect for wear or scoring.
Inspect the parts as follows:

PARKING GEAR
1. Separate countershaft 1 st gear from the parking

gear by turning the parking gear in the direction

shown.
One-way Clutch/Parking Gear

Disassembly and InspectionProCarManuals.com

THRUST NEEDLE

BEARING

SEALING RINGS
35 mm
3RD GEAR

NEEDLE BEARING

37 x 43 x 22 mm
2ND GEAR
THRUST NEEDLE

BEARING

THRUST WASHER
O-RINGS

Replace. 2ND CLUTCH

ASSEMBLY

SPACER 31 mm LOCKNUT
Replace.
140 N .
m

(14.0 kg-m. 101 Ib-ft)
CONICAL SPRING

WASHER
Replace.

SECONDARY SHAFT

Check splines for excessive
wear or damage.

Check bearing surface for
Lubricate all parts with ATF during reassembly.

Install thrust needle bearings with unrolled edge of bearing retainer facing washer.

Inspect thrust needle and needle bearings for galling and rough movement.
Before installing the O-rings, wrap the shaft splines with tape to prevent damage to the O-rings.

NOTE:

Disassembly/Inspection/Reassembly
Secondary Shaft
scoring, scratches or exces-
sive wear.ProCarManuals.com

2ND CLUTCH

ASSEMBLY
FEELER GAUGE
2ND GEAR
3RD GEAR
THRUST WASHER
THRUST NEEDLE

BEARING

SECONDARY SHAFT/

3RD GEAR
Push this direction.

THRUST NEEDLE

BEARING
NEEDLE BEARING
2ND GEAR
THRUST NEEDLE

BEARING
THRUST WASHER
2ND CLUTCH

ASSEMBLY

CHAMFER
2ND CLUTCH ASSEMBLY
SECONDARY SHAFT/

3RD GEAR
2. Hold the 2nd clutch assembly against the 3rd gear.

Measure the clearance between the 2nd gear and

thrust needle bearing using a feeler gauge.

NOTE: Take measurements in at least three places

and take the average as the actual clearance.
Secondary Shaft

Inspection/Installation

NOTE:

Lubricate all parts with ATF during assembly.

Before installing the O-rings, wrap the shaft splines

with tape to prevent damage to the O-rings.

1. Assemble the parts below on the secondary shaft.

Install the thrust washer so that the large

chamfer on the circumference faces the 2nd

clutch assembly.

Do not install the O-rings during inspection.ProCarManuals.com

3. If the clearance is out of tolerance, select and in-

stall a new thrust washer.

THRUST WASHER

THRUST WASHER

4. After replacing the thrust washer, make sure that

the clearance is within tolerance.ProCarManuals.com

Clutch

Illustrated Index

1ST CLUTCH

4TH CLUTCH

SNAP RING

CLUTCH END

PLATE

CLUTCH DISCS

Standard thickness:

2.34 mm (0.092 in)
CLUTCH

PLATES

Standard

thickness:

2.3mm

(0.091 in)
CLUTCH DRUM

O-RINGS

Replace.

CLUTCH PISTON

RETURN SPRING

SPRING RETAINER

CIRCLIP

CLUTCH DISCS

Standard thickness:

1.94 mm (0.076 in)
CIRCLIP

SPRING RETAINER

RETURN SPRING

CLUTCH PISTON

O-RINGS

Replace.

CLUTCH DRUM

CLUTCH PLATES

Standard

thickness:

2.0 mm

(0.079 in)
CLUTCH END PLATE

SNAP RINGProCarManuals.com

(cont'd)
CLUTCH DRUM
O-RINGS

Replace.
CLUTCH PISTON
RETURN SPRING
SPRING RETAINER
CIRCLIP

CLUTCH PLATES

Standard thickness:

2.0 mm (0.079 in)

SNAP RING
CLUTCH END PLATE
CLUTCH DISCS

Standard thickness:

1.94 mm (0.076 in)
CIRCLIP
SPRING RETAINER
RETURN SPRING
DISC SPRING
CLUTCH PISTON
O-RINGS

Replace.
CLUTCH DISCS

Standard thickness:

1.94 mm (0.076 in)
CLUTCH END PLATE
SNAP RING
3RD CLUTCH
1ST-HOLD CLUTCH

CLUTCH PLATES

Standard thickness:

2.3 mm (0.091 in)
BALL BEARING

CLUTCH DRUMProCarManuals.com

SNAP RING
CLUTCH END PLATE
CLUTCH DISCS

Standard thickness:

1.94 mm (0.076 in)
CLUTCH PLATES

Standard thickness:

2.3 mm (0.091 in)
CIRCLIP
SPRING RETAINER
RETURN SPRING
DISC SPRING
CLUTCH PISTON
O-RINGS

Replace.
CLUTCH DRUM
Clutch

Illustrated Index (cont'd)

2ND CLUTCHProCarManuals.com

(cont'd)

Do not set here.

Set here.

CAUTION: If either end of the compressor attach-
ment is set over an area of the spring retainer which is
unsupported by the return spring, the retainer may be
damaged.

CLUTCH SPRING
COMPRESSOR
BOLT ASSEMBLY

07GAE-PG4O200

DISC SPRING

2. Remove the disc spring.

NOTE: For 1 st-hold and 2nd clutches
SCREWDRIVER

CLUTCH SPRING
COMPRESSOR
ATTACHMENT

07HAE-PL50100
CLUTCH SPRING

COMPRESSOR

ATTACHMENT

07LAE-PX40100

3. Install the special tools as shown.

1. Remove the snap rings, then remove the clutch end

plate, clutch discs and plates.

SNAP RING

DisassemblyProCarManuals.com

5. Remove the circlip. Then remove the special tool,

spring retainer and return spring.
Clutch

Disassembly (cont'd)

4. Compress the clutch return spring.

6. Wrap a shop rag around the clutch drum and apply air

pressure to the oil passage to remove the piston. Place

a finger tip on the other end while applying air

pressure.

OIL PASSAGE

COMPRESSED AIR

HOSE NOZZLE

OSHA-Approved 30 psi

type only.ProCarManuals.com

(cont'd)
RETURN SPRING

O-RING
SPRING RETAINER
CIRCLIP

DISC SPRING
CLUTCH PISTON
5. Install the return spring and spring retainer and position

the circlip on the retainer.
CLUTCH DRUM

O-RINGS
PISTON

2. Install a new O-ring on the clutch piston.

3. Be sure that the disc spring is securely staked.

NOTE: For 1st, 3rd and 4th clutches.
PISTON
CAUTION: Do not pinch O-ring by installing the

piston with force.
4. Install the piston in the clutch drum. Apply pressure

and rotate to ensure proper seating.

NOTE: Lubricate the piston O-ring with ATF before in-

stalling.
Reassembly

NOTE:

Clean all parts thoroughly in solvent or carburetor clean-

er, and dry with compressed air.

Blow out all passages.

Lubricate all parts with ATF before assembly.

1. Inspect for a loose check valve.

CHECK VALVEProCarManuals.com