ACURA NSX 1991 Service Repair Manual

12. Disconnect the connectors from the EPS wire
harness.
13. Remove the ground cable by removing the EPS wire harness stay.
EPS WIREHARNESS STAY EPS WIRE HARNESS
GROUND

CABLE
FLANGE BOLT
10 N .
m (1.0 kg-m, 7 Ib-ft)
14. Remove the terminal guard and ground cable.
15. Remove the terminal nuts and the wires from the gearbox terminals.
TERMINAL NUTS10 N .
m
(1.0 kg-m, 7 Ib-ft)
GROUND CABLE

NOTE: After tight-

ening the terminal
nuts, bend up the

terminal tabs
against the nuts

securely.

FLANGE BOLT 10 N .
m (1.0 kg-m, 7 Ib-ft)
TERMINAL GUARD
Corrosion resistant bolt
FLANGE BOLT
10 N ·
m (1.0 kg-m, 7 Ib-ft) 16. Remove the radiator pipe bracket at the front com-
partment bulkhead.
RADIATOR PIPE BRACKET
RADIATOR PIPE
17. Remove the radiator pipe bracket at the floor, and space the radiator pipe away from and gearbox.
RADIATOR PIPE
RADIATOR PIPE

BRACKET

(cont'd)ProCarManuals.com

Power SteeringGearbox Removal/Installation (cont'd)

NOTE: Before removing the gearbox, place a stand
jack under the gearbox and front crossbeam to lightly

support them. Lower the gearbox together with the

front crossbeam.
18. Remove the flange bolts and nuts of the gearbox and front crossbeam.
FLANGE NUTS
60 N.m (6.0 kg-m, 43 Ib-ft)
10 x 97 mm

FLANGE BOLT (Crossbeam bracket
to Front crossbeam)

10 x 97 mm

FLANGE BOLT (Crossbeam bracket
to Front crossbeam)
FLANGE NUT

60N .
m

(6.0 kg-m,
43 Ib-ft)
10 x 97 mm

FLANGE BOLT
(Crossbeam bracket
to Front crossbeam)

LEFT SIDE:

RIGHT SIDE:
10 x 84 mm

FLANGE BOLT

60N .
m

(6.0 kg-m, 43 Ib-ft) (Gearbox to Front
crossbeam)
Corrosion resistant bolt/nut
10 x 68 mm

FLANGE BOLT

60N ·
m

(6.0 kg-m, 43 Ib-ft)
(Front crossbeam
to crossbeam bracket)
10 x 68 mm

FLANGE BOLT

60N ·
m

(6.0 kg-m, 43 Ib-ft)
(Front crossbeam to
crossbeam bracket)
10 x 97 mm

FLANGE BOLT

60N·m

(6.0 kg-m, 43 Ib-ft) (Gearbox to Front
crossbeam) 19. Lower the gearbox and front crossbeam with care

so as not to interfere with the radiator pipe.

NOTE: The crossbeam is attached to the cross-
beam bracket with knock pins. Remove the cross-
beam by lightly taping on it with a plastic hammer,

then remove the gearbox.
LEFT CROSSBEAM BRACKET
FRONT CROSSBEAM
GEARBOX

ASSEMBLY

20. When installing the crossbeam to the crossbeam bracket, be sure to align the holes in the crossbeam

with the knock pins on the crossbeam bracket.

CROSSBEAM

BRACKET

KNOCK PIN
FRONT CROSSBEAM RIGHT CROSSBEAM

BRACKET

STEERING

GEARBOX
BRACKET

CUSHION B
MOUNT BASE
FLANGE NUT

60N
·
m

(6.0 kg-m, 43 Ib-ft)ProCarManuals.com

21. Install the gearbox in the reverse order of removal.
NOTE: When connecting the steering joint, make
sure that the cable reel of airbag system is
centered.
22. Set the steering rack in the center of its stroke.
23. Center the cable reel as follows: Turn the steering wheel left approx. 150 degrees,
to check the cable reel position with indicator. If the cable reel is centered, the yellow gear tooth
lines up with the alignment mark on the cover.
Return the steering wheel right approx. 150
degrees to position the steering wheel in the
straight ahead position.
YELLOW GEAR TOOTH
ALIGNMENT MARK
24. Slip the lower of the steering joint onto the pinion shaft (line up the bolt hole with the groove around
the shaft) and loosely install the lower bolt.

NOTE:
Be sure that the lower steering joint bolt is
securely in the groove in the steering gearbox
pinion.

If the steering wheel and rack are not aligned
centered, reposition the serrations at lower side
of the steering joint.
25. Adjust the front toe after install the gearbox (see section 18).ProCarManuals.com

Power Steering

Illustrated Index

CAUTION: Do not try to disassemble the power steering gearbox. If the gearbox is faulty, replace it as an assembly.
Corrosion resistant bolt/nut
GEARBOX ASSEMBLY
MOUNT BASE
10 mm FLANGE NUT

60 N ·
m

(6.0 kg-m, 43 Ib-ft)
FLANGE BOLT
10 N.m

(1.0 kg-m, 7 Ib-ft)
GROUND CABLE

STOP WASHER
LOCK WASHERReplace.
RACK END
55 N ·
m (5.5 kg-m, 40 Ib-ft)
BOOT

Check for damage.

STEERING GREASE
(Honda P/N 08733-B070E)

Coat the inside of the boot.

SILICONE GREASE
Coat the sliding surface

of the rack end. TIE-ROD
LOCKNUT44N·m
(4.4 kg-m, 32 Ib-ft)
TIE-ROD END BOOT
Replace.
SET RING
TUBE CLAMP COTTER PIN
Replace.
CASTLE NUT

44 N·m

(4.4 kg-m, 32 Ib-ft)
FLANGE BOLT

10 N ·
m

(1.0 kg-m, 7 Ib-ft) TERMINAL
GUARDFLANGE BOLT

10 N.m

(1.0 kg-m, 7 Ib-ft)
10 x 97 mm

FLANGE BOLT

60N .
m

(6.0 kg-m, 43 Ib-ft)
STEERING GROMMET

Check for damage.

CUSHION B

Check for damage.
STEERING
GEARBOX BRACKET
10 x 97 mm

FLANGE BOLT
10 x 84 mm

FLANGE BOLT

60N ·
m

(6.0 kg-m, 43 Ib-ft)
WIRE HARNESS STAY 10 mm FLANGE NUT

60 N·m

(6.0 kg-m, 43 Ib-ft)

MOUNT COLLER
MOUNT BUSHING

Check for damage.

BOOT BAND
Replace.ProCarManuals.com

Inspection

1. Carefully clamp the gearbox in a vise with soft jaws.
2. Remove the boot bands.
BOOT BAND
Replace.

LOCK WASHER

Replace.

(cont'd)

10 cm

(0.4 in)
STEERING INSPECTION ARM

07974-SD90000

60 mm
(2.4
in)

Preload Inspection:

3. Pull the boots away from the ends of the gearbox, unbend the tie-rod lock washers.
4. Hold the rack with a wrench, and unscrew the tie- rods with another wrench.
Rack guide screw adjustment:
Loosen the rack guide screw locknut.
Tighten, loosen and retighten the rack guide screw
two times to 4 N.m (0.4 kg-m, 2.9 Ib-ft), back it off NOTE: Slide the steering rack in the cylinder until
the end of the rack projects 60 mm (2.4 in) from
the cylinder end. Inspection is made near this rack
position.

Install the special tool on the pinion shaft and check
the preload with a spring scale. If the preload is out of the specification, adjust the
rack guide.
Preload 30 N (3 kg, 6.6 Ibs) maximum

20

UnbendProCarManuals.com

Power Steering
Inspection (cont'd)
Retighten the locknut while holding the rack guide
screw with a wrench. Tie-rod installation:
5. Screw each rack end into the rack while holding the
lock washer so its tabs are in the slots in the rack

end.

NOTE: Install the stopper washer with the cham-
fered side facing out.
6. Tighten the rack end securely, then band the lock washer back against the flat on the flange as shown.
NOTE: Coat the stopper washer with grease suffi-

LOCKNUT
25 N.m (2.5 kg-m, 18 Ib-ft)
LOCKNUT WRENCH. 40 mm

07916-SA50001

RACK END

55 N.
m

(5.5 kg-m, 40 Ib-ft)

ciently.

RACK END

TAB

SLOT
STOPPER WASHER
LOCK WASHER

Installation

direction.

bends.ProCarManuals.com

7. Install the boots on the rack end with the tube

clamps.
NOTE:

BOOT

TUBE CLAMP

STEERING GREASE
(Honda P/N 08733-B070E)

Coat the inside of the boot.

SILICONE GREASECoat the sliding surface of the rack end.
8. Install the new boot bands on the boot and bend both sets of locking tabs.
Lightly tap on the doubled portions to reduce their
height.
NOTE: After assembling, slide the rack right and left
to be certain that the boots are not deformed or
twisted. 9. If the tie-rod ends were removed, install the tie-
rods on the right and left rack ends and screw them
in until the threaded section is 11 mm (0.4 in) in

length.

10. Install the gearbox and the front crossbeam (see page 17-66).
11. Check the wheel alignment and adjust if necessary (see section 18).
BOOT BAND
LOCKING TABS
11 mm
(0.4
in)

LOCKNUT

Hand tighten.
TIE-ROD END
Coat the rack end and inside of the boot with the

grease.
Before installing the boot, be sure that the pres-
sure inside of the boot is the atmospheric
pressure. .
Install the boot band with the rack in the straight
ahead condition (i.e. right and left tie-rods are
equal in length).ProCarManuals.com

Power Steering
Ball Joint Boot Replacement
1. Remove the set ring and the boot. CAUTION: Do not contaminate the boot installation
section with grease.
2. Pack the interior of the boot and lip with grease.
5. Insert the special tool into the threads in the ball pin

and align the end of the tool with the groove in the

boot.

Slide the set ring over the tool and into position.

CAUTION: After installing the boot, check the ball pin tapered section for grease. Wipe it if necessary.
3. Wipe the grease off the sliding surface of the ball
pin, then pack the lower area with fresh grease.

CAUTION:
BOOT INSTALLATION SECTION

BALL PIN TAPERED

SECTION

4. Install the boot in the groove of the boot installation section securely, then bleed air.
BOOT INSTALLATION

SECTION

LIP


BALL JOINT BOOT CLIP GUIDE

07MAG-SL00100

Adjust the depth by

turning the tool.
BOOT

SET RING

Keep grease off the boot installation section and
the tapered section of the ball pin.
Do not allow dust, dirt, or other foreign materi-
als to enter the boot.ProCarManuals.com

Power Unit

Replacement

1. Remove the floor mat and speaker cover.
2. Disconnect the connector from the speaker and re- move the speaker by removing the bolt and nut.
SPEAKER COVER 5. Remove the power unit by disconnecting the con-
nector.

10 N.m

(1.0 kg-m, 7 lb-ft)
3. Remove the power unit bracket.
4. Bend terminal nut tabs back and remove the ter- minal nuts and disconnect the cables from the

power unit terminals.

Installation is the reverse order of removal.
NOTE:

SPEAKER

TERMINAL NUT
10 N ·
m

(1.0 kg-m, 7 Ib-ft)

BRACKET

POWER UNIT
10 N
·
m

(1.0 kg-m,

7 Ib-ft)
POWER UNIT

After tightening the terminal nuts, bend up the

terminal nut tabs against the nut securely.
Turn the ignition switch ON and check the EPS

indicator light for operation.ProCarManuals.com

EPS Control unit
Replacement
CAUTION: Be careful not to damage the SRS wire
harnesses when servicing the control unit. 1. Remove the dashboard lower cover and glove box
and disconnect the light connector.
3. Disconnect the connectors from the EPS control
unit by removing the wire harness band.

EPS CONTROL UNIT

4. Remove the power window control unit by pulling it
toward you, then remove the EPS control unit.

5. Installation is the reverse of the removal procedure.
NOTE: Turn the ignition switch ON and check the

EPS indicator light for operation.

HEATER DUCT

2. Move the heater duct right then remove the heater

duct.
DASHBOARD LOWER COVER
GLOVE BOX

EPS CONTROL UNIT
POWER WINDOW CONTROL

UNIT

10 N ·
m

(1.0 kg-m, 7 Ib-ft)

All SRS wire harnesses and connectors
are colored yellow. Do not use electrical test equipment
on these circuits.

CONNECTORSProCarManuals.com