ACURA NSX 1991 Service Repair Manual

O-RING
Replace.
4TH ACCUMLATOR
PISTON

1ST ACCUMULATOR

PISTON
O-RINGS
Replace. DOWEL PINTHROTTLE
SEPARATOR PLATE THROTTLE
VALVE BODY
THROTTLE VALVE B
SERVO VALVE
(SHIFT FORK SHAFT)
6 x 1.0 mm

12 N .
m

(1.2 kg-m, 9 Ib-ft) ATF MAGNET
O-RING
Replace.
ATF STRAINER

6 x 1.0 mm

12 N .
m (1.2 kg-m. 9 Ib-ft)
ACCUMULATOR

COVER

6 x 1.0 mm

12 N .
m

(1.2 kg-m, 9 Ib-ft)

SERVO DETENT SERVO BODY SEAT

CAP
3RD ACCUMULATOR
PISTON

Servo Body/Throttle Valve Body

Disassembly/lnspection/Reassembly

Clean all parts thoroughly in solvent or carburetor cleaner, and dry with compressed air.

Blow out all passages.
Replace valve body as an assembly if any parts are worn or damaged.

Check all valves for free movement. If any fail to slide freely, see Valve Body Repair on page 14-109.

Coat all parts with ATF before reassembly.
Replace the O-rings.

BASE

NOTE:ProCarManuals.com

SPRING SPECIFICATIONS

Unit of length: mm (in)

After disassembly of the ATF strainer, check that it is in good condition, and the inlet opening is not clogged.

Replace the strainer with a new one if it is clogged or damaged.

The strainer can be reused if it is not clogged. Clean the inlet opening thoroughly with compressed air before reinstall-

ing it.

ATF STRAINER

INLET OPENING
NOTE:ProCarManuals.com

SPRING SPECIFICATIONS

Unit of length: mm (in)

REGULATOR

VALVE BODY LOCK BOLT

6 x 1.0 mm

12 N .
m (1.2 kg-m, 9 Ib-ft)
REGULATOR VALVE
COOLER RELIEF
VALVE REGULATOR SPRING CAP
VALVE SEAT LOCK-UP CONTROL
VALVE

SLEEVE

CAP

ROLLER

Regulator Valve Body

Disassembly/inspection/Reassembly—

Clean all parts thoroughly in solvent or carburetor cleaner, and dry with compressed air.
Blow out all passages.
Replace valve body as assembly if any parts are worn or damaged.
Check all valves for free movement. If any fail to slide freely, see Valve Body Repair on page 14-109.

NOTE:

1. Hold the regulator spring cap in place while removing the lock bolt. Once the bolt is removed, release the spring cap slowly.
CAUTION: The regulator spring cap can pop out when the lock bolt is removed.
2. Reassembly is in the reverse order of disassembly.
Coat all parts with ATF.
Align the hole in the regulator spring cap with the hole in the valve body, press the spring cap into the body and

tighten the lock bolt.

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Unit of length: mm (in)

SPRING SPECIFICATIONS
ROLLER

CAP
LOCK-UP SHIFT VALVE LOCK-UP VALVE
BODY
LOCK-UP TIMING VALVE B
Lock-up Valve Body
Disassembly/Inspection/Reassembly
Clean all parts thoroughly in solvent or carburetor cleaner, and dry with compressed air.Blow out all passages.
Replace valve body as an assembly if any parts are worn or damaged.
Check all valves for free movement. If any fail to slide freely, see Valve Body Repair on page 14-109. Coat all parts with ATF before reassembly.

NOTE:ProCarManuals.com

SPRING SPECIFICATIONS
SNAP RING SNAP RING

Unit of length: mm (in)

O-RING
Replace.
1ST-HOLD ACCUMULATOR PISTON
O-RING Replace.
2ND ACCUMULATOR PISTON
O-RING

Replace. 2ND ACCUMULATOR

BODY

LIMITED SLIP DIFFERENTIAL

RELIEF VALVE

VALVE SEAT

6 x 1.0 mm

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

Clean all parts thoroughly in solvent or carburetor cleaner, and dry with compressed air.
Blow out all passages.
Replace valve body as an assembly if any parts are worn or damaged.
Check all valves for free movement. If any fail to slide freely, see Valve Body Repair on page 14-109.
Coat all parts with ATF before reassembly.

2nd Accumulator Body

Disassembly/lnspection/Reassembly

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SEALING RINGS
NEEDLE BEARING
SET RING
O-RINGS
Replace. 4TH CLUTCH
ASSEMBLY

THRUST WASHER

THRUST NEEDLE BEARING
1ST GEAR

COLLAR

THRUST WASHER
1ST GEAR
NEEDLE BEARING

33 x 38 x 24 mm
THRUST NEEDLEBEARING THRUST WASHER O-RINGS
Replace. 1ST CLUTCH

ASSEMBLY

CONICAL SPRING

WASHER

Replace.
LOCKNUT

Replace.
140 N.m
(14.0 kg-m, 101 Ib-ft)
SNAP RING
WASHER

THRUST NEEDLE

4TH/REVERSE
NEEDLE BEARINGS
34 x 40 x 20 mm

4TH GEAR

COLLAR

MAINSHAFT

Check splines for excessive

wear or damage.

Check bearing surface for

scoring, scratches or excessive

Mainshaft

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

GEAR

BEARING

wear.

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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