1991 ACURA NSX Service Repair Manual

3RD ORIFICE
CONTROL VALVE
VALVE CAP

ROLLER

VALVE SEAT
2ND EXHAUST VALVE
CPC VALVE
SECONDARY VALVE BODY
4-3 KICK-DOWN VALVE CHECK BALLS (7/32) 7
3-2 KICK-DOWN VALVE

FILTER
Replace.

Install in this direction.

4TH EXHAUST

VALVE

SERVO CONTROL

VALVE

MODULATOR VALVE
2ND ORIFICE CONTROL

VALVE

Secondary 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.
CAUTION: Do not use a magnet to remove the check balls; it may magnetize the balls.
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NOTE: All check balls are the same size (7/32) 7.

2ND CHECK

CHECK BALLS

CHECK BALL

SECONDARY

VALVE BODY

Sectional view

CHECK BALL

3RD CHECK BALL
CHECK BALL

Unit of length: mm (in)
SPRING SPECIFICATIONS
BALLProCarManuals.com

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

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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
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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.

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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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