1991 ACURA NSX Service Repair Manual

O-RINGS

Replace.
3RD CLUTCH ASSEMBLY
3RD GEAR COLLAR
PARKING GEAR
RETAINER PLATE 1ST GEAR COLLAR
NEEDLE BEARINGS

34 x 40 x 20 mm
ONE-WAY
CLUTCH

1ST GEAR

1ST-HOLD CLUTCH

HUB
THRUST NEEDLE

BEARING

THRUST WASHER O-RINGS
Replace. 1ST-HOLD CLUTCH

ASSEMBLY

LOCKNUT

Replace.

140 N·m

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

REVERSE GEAR COLLAR

THRUST WASHER

REVERSE GEAR

NEEDLE BEARING

37 x 43 x 16 mm

4TH GEAR

NEEDLE BEARING

Separate type
CATION:
Use needle bearing
of same color.

2ND GEAR

THRUST NEEDLE

BEARING

3RD GEAR
NEEDLE BEARING

44 x 52 x
24.5
mm

THRUST NEEDLE
BEARING

COUNTERSHAFT
Check splines for excessive wear or damage.

Check bearing surface for scoring, scratches or

excessive wear.

Countershaft

Disassembly/Inspection/Reassembly

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.

Locknut has left-hand threads.

Before installing the O-rings, wrap the shaft splines with tape to prevent damage to the O-rings.

REVERSE

SELECTOR

REVERSE

SELECTOR HUB
COTTER

RETAINER
COTTERS
2ND GEAR

SPACER

WASHER

Replace.

CAUTION: Before installing the 1st-hold clutch O-rings, install the 1st gear collar and thrust washer. NOTE:ProCarManuals.com

Inspection/Installation

NOTE: Lubricate all parts with ATF during assembly.
1. Assemble the parts below on the countershaft. NOTE: Do not install the O-rings during inspection.
COTTERS

2ND GEAR SPACER

2ND GEAR

THRUST NEEDLE BEARING

3RD GEAR

NEEDLE BEARING
THRUST NEEDLE BEARING
3RD GEAR COLLAR

3RD CLUTCH ASSEMBLY

COUNTERSHAFT
2. Hold the 2nd gear against the 3rd gear. Measure the
clearance between the 3rd gear and thrust needle
bearing with a feeler gauge.
NOTE: Take measurements in at least three places
and take the average as the actual clearance.
2ND GEAR
3RD GEAR
FEELER GAUGE3RD GEAR COLLAR
TRUST
NEEDLE
BEARING
2ND GEAR
3RD GEAR

Length

3RD GEAR
COLLAR

3RD GEAR COLLAR

(cont'd)ProCarManuals.com

2ND GEAR SPACER
COTTER
FEELER GAUGE
2ND GEAR
3RD GEAR COTTER
2ND GEAR SPACER
6. After replacing the cotters, make sure that the

clearance is held within tolerance.

7. Remove the countershaft bearing from the trans-
mission housing. See page 14-144.

8. Assemble the countershaft including bearing and
all parts shown to on page 14-124.

5. If the clearance is out of tolerance, select and install a

new cotters.

COTTER 31.5 mm
Countershaft

Inspection/Installation (cont'd)

3. If the clearance is out of tolerance; -1. Select and install a new 3rd gear collar andrecheck the clearance.
-2. If the clearance is still out of tolerance, replace the two thrust needle bearings and recheck the
clearance.

If the clearance still exceeds the service limit even

with new thrust needle bearings, check the 3rd

gear, 2nd gear and 3rd gear collar for wear, and

replace any worn parts.
After replacing parts, make sure that the clearance

is within tolerance.

NOTE:

4. Hold the 2nd gear against the 3rd gear. Measure the clearance between the 2nd gear spacer and cotters

with a feeler gauge.

NOTE: Take measurements in at least three places,
and take the average as the actual clearance.ProCarManuals.com

9. Torque the countershaft locknut to 30 N
.
m (3.0 kg-m,

22 Ib-ft).

COUNTERSHAFT BEARING 11. If the clearance is out of tolerance, select and install a

new cotter retainer.

THICKNESS
COTTER RETAINER
COTTER RETAINER
12. After replacing the cotter retainer, make sure that
the clearance is within tolerance.

LOCK NUT

30 N
.
m

(3.0 kg-m, 22 Ib-ft)
10. Measure the clearance between 4th gear and reverse selector hub with a feeler gauge.
NOTE: Take measurements in at least three places,
and take the average as the actual clearance.
FEELER GAUGE
COTTER RETAINER 4TH GEAR REVERSE SELECTOR HUBProCarManuals.com

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