ACURA NSX 1991 Service Repair Manual

Engine Removal/Installation
(cont'd )


32. Remove the rear beam rod assembly.
33. Remove the front beam. Lower and suspend the air conditioning (A/C) compressor. Reinstall the frontbeam.

NOTE:

PARKING BRAKE CABLE

Hang with

wire or rope.

FRONT BEAM

REAR BEAM

ROD ASSEMBLY

Remove.

A/C COMPRESSOR

Do not remove the compressor hoses.
Hang the A/C compressor with wire
or rope as shown.
Do not let it hang from hoses.
Retorque the two nuts
NOTE:

Do not remove the compressor hoses.
Do not let the compressor hang from hoses.
34. Remove the left and right parking brake cables.
35. Disconnect the stabilizer bar end links from the knuckles, remove the bar. Separate the dampers
from the knuckles.ProCarManuals.com

36. Remove the rear brake hoses. Plug the brake pipes
with rubber caps.
37. Remove the wheel sensor wire clamps. NOTE: Perform steps 38 and 39 only if the
engine/transaxle assembly is to be removed from
the subframe. 38. Remove the adjust bolt and flange bolt, then
separate the lower control arm from the subframe.

39. Remove the flange bolt, then separate the toe con-
trol arm from the subframe.
CAUTION: Make sure that the reference marks on
the control arm are aligned.

: CORROSION RESISTANTBOLT/NUT

6 x 1.0 mm

10 N .
m (1.0 kg-m, 7 Ib-ft)
DAMPER

STABILIZER

Plug the brake

pipes with

rubber caps.

FLANGE BOLT
12 x
1.25
mm

95 N .
m (9.5 kg-m, 69 Ib-ft)

12 x
1.25
mm

SELF-LOCKING NUT
Replace

85 N .
m (8.5 kg-m, 62 Ib-ft)
WHEEL SENSOR
WIRE CLAMP
SELF-LOCKING NUT
14 x 1.5 mm

Replace
125 N .
m (12.5 kg-m. 90 Ib-ft)
12 x
1.25
mm

SELF-LOCKING NUT

Replace

95 N .
m (9.5 kg-m, 69 Ib-ft)
DAMPER
6 x 1.0 mm

10 N .
m (1.0 kq-m, 7 Ib-ft)
STABILIZER

6 x 1.0 mm

10 N .
m (1.0 kg-m, 7 Ib-ft)
FLANGE BOLT
12 x
1.25
mm

95 N·m
(9.5
kg-m,
69 Ib-ft)

12 x
1.25
mm

SELF-LOCKING NUT

Replace

85 N·m (8.5 kg-m, 62 Ib-ft)
WHEEL SENSOR

WIRE CLAMP

SELF-LOCKING NUT
14 x 1.5 mm

Replace

125 N .
m (12.5 kg-m, 90 Ib-ft)

(cont'd)

12 x
1.25
mm

SELF-LOCKING NUT

Replace

95 N .
m (9.5 kg-m, 69 Ib-ft)ProCarManuals.com

Engine Removal/Installation

(cont'd)

40. Remove the heated oxygen sensor (HO2S) connectors.
41. Remove the self-locking nuts, then remove front exhaust pipe and the front three way catalyticconverter.
42. Remove the self-locking nuts, then separate the rear three way catalytic converter from rear ex-
haust pipe and the muffler.
CAUTION: Do not use an air wrench or hammer to
remove or install the exhaust system unless you

first remove the heated oxygen sensors.

NOTE: Use new gaskets and self-locking nuts
when reassembling.
NOTE: Perform steps 43 and 44 only if the
engine/transaxle assembly is to be removed from
the subframe.

SELF-LOCKING NUTS
10 x
1.25
mm

34 N .
m
(3.4
kg-m.
25 Ib-ft)
REAR THREE WAY

CATALYTIC
CONVERTER
GASKETS
Replace.

FRONT
EXHAUST PIPE
SELF-LOCKING NUT
10 x
1.25
mm

55 N .
m
(5.5
kg-m,
40 Ib-ft) DRIVESHAFTSET RING

Replace.

6 x 1.0 mm

10 N .
m (1.0 kg-m, 7 Ib-ft)
HALF SHAFT
HEAT COVER
43. Remove the half shaft heat cover.
44. Remove the driveshafts.

NOTE:
Coat all precision finished surfaces with clean
engine oil or grease.
Tie plastic bags over the driveshaft ends.ProCarManuals.com

45. Install the front engine mounting bolt, torque the
nut temporarily.
46. Position the Engine Removal/Installation Fixture (07MAK –PR7020A) under the car. Lower the car
just above the fixture. With the help of an assis-
tant, attach the fixture to the subframe with two 12 mm nuts and two 10 mm bolts. 47. Adjust the pads on the fixture to support the oil
pan and transmission housing.
48. Lower the car so the fixture is resting on its casters (or appropriate platform).

BODY SUPPORT

BRACKET

SIDE ENGINE
MOUNT
TRANSMISSION MOUNTING
BOLT

LOOSELY INSTALL

TWO 12 mm NUTS
ON STUDS HERE

LOOSELY
INSTALL

ONE 10 mm

BOLT HERE

ENGINE REMOVAL/INSTALLATION

FIXTURE

07MAK–PR7020A
(cont'd)ProCarManuals.com

Engine Removal/Installation

(cont'd)

49. Remove the two bolts from the side engine mount near the alternator. Pivot the mounting bracket into
the housing of the body.
50. Remove the transmission mounting bolt.
51. Remove the twelve subframe-to-body mounting
bolts.
52. Raise the car a few inches.
53. Check that all wires and hoses are disconnected
from the engine assembly.
54. Raise the car completely off the engine/suspension assembly. Roll the assembly from under the car.

TRUCK GUIDE HOLE
(BODY)
TAPERED PUNCH
GUIDE HOLE
(SIDE BEAM)

NOTE: When installing, align the bolt holes of the

beam brackets and body with a tapered punch.ProCarManuals.com

55. Attach a chain hoist to the engine. Remove the
front and rear mounting bolts, then separate the
engine from the suspension and the beam
assembly.
CAUTION: Do not hit the engine oil cooler on the
rear right beam bracket.

FRONT ENGINE

MOUNT

REAR ENGINE

MOUNT

56. Install the engine in the reverse order of removal:
NOTE:
Combine the front beam and the rear beam rod

assembly, then torque the four mounting bolts.

Check that the set ring on the end of each

driveshaft clicks into place.

CAUTION: Use new set rings.
(cont'd)
Align the bolt holes of the beam brackets and
body with a tapered punch (page 5-28).
Temporarily torque the two front beam nuts and

front engine mounting bolt when installing the

A/C compressor.ProCarManuals.com

55. Attach a chain hoist to the engine. Remove the
front and rear mounting bolts, then separate the
engine from the suspension and the beam
assembly.
CAUTION: Do not hit the engine oil cooler on the
rear right beam bracket.

FRONT ENGINE

MOUNT

REAR ENGINE

MOUNT

56. Install the engine in the reverse order of removal:
NOTE:
Combine the front beam and the rear beam rod

assembly, then torque the four mounting bolts.

Check that the set ring on the end of each

driveshaft clicks into place.

CAUTION: Use new set rings.
(cont'd)
Align the bolt holes of the beam brackets and
body with a tapered punch (page 5-28).
Temporarily torque the two front beam nuts and

front engine mounting bolt when installing the

A/C compressor.ProCarManuals.com

Engine Removal/Installation

(cont'd)

Torque the engine mounting bolts in sequenceshown below.
CAUTION: Failure to tighten the bolts in the proper

sequence can cause excessive noise and vibration

and reduce bushing life; check that the bushings

are not twisted or offset.
Bleed air from the cooling system (see section 10)
Bleed air from the brake lines (see section 19)
Adjust the throttle cable tension.
Check the clutch pedal free play.
Adjust the clutch guide assemblies when
disassembling clutch (see section 12). Check that the transmission shifts into gear
smoothly (M/T see section 13, A/T see section 14).
Adjust the alternator belt (see section 23).
Adjust the A/C belt (see section 22).
Clean battery posts and cable terminals with sand-
paper, assemble, then apply grease to prevent

corrosion.

Inspect for fuel leakage:
• After assembling fuel line parts, turn on the igni- tion switch (do not operate the starter) so that
the fuel pump operates for approximately two seconds and the fuel line pressurizes. Repeat
this operation two or three times and check whether any fuel leakage has occurred at any
point in the fuel line.
Check and adjust wheel alignment.

10 x
1.25
mm

60 N .
m (6.0 kg-m, 43 Ib-ft)
MOUNTING BOLT SPECIAL BOLT

12 x
1.25
mm

77 N .
m
(7.7 kg-m,
56 Ib-ft)

Replace.
10 x
1.25
mm

60 N .
m
(6.0 kg-m
43 Ib-ft) 73 N.m (7.3 kg-m, 53 Ib-ft)

12 x
1.25
mm

95 N .
m
(9.5 kg-m,
69 Ib-ft)

RUBBER CAP

(M/T only)
SIDE MOUNT
: CORROSION RESISTANT
BOLT/NUT

12 x
1.25
mm

105 N .
m (10.5 kg-m, 76 Ib-ft)

10 x
1.25
mm

60 N .
m (6.0 kg-m, 43 Ib-ft) MOUNTING BOLT FRONT MOUNT
TRANSMISSION
MOUNT (A/T)

12 x
1.25
mm

95 N .
m
(9.5 kg-m,
69 Ib-ft)
SEAT STOPPER
TRANSMISSION
MOUNT (A/T)

REAR MOUNT
SPECIAL NUT
12 x
1.25
mm

77 N .
m
(7.7 kg-m,
56 Ib-ft)

Replace.
M/T:

A/T:

After the engine is in place:ProCarManuals.com

Additional Torque Value Specifications:

NOTE: For manifold replacement, refer to section 9.

ENGINE HANGER

8 x
1.25
mm

30 N .
m
(3.0 kg-m,

22 Ib-ft)
A/T TRANSMISSION HANGERS

8 x
1.25
mm
30 N .
m

(3.0 kg-m,

22 Ib-ft)

M/T TRANSMISSION

HANGERS

12 x
1.25
mm

75 N .
m (7.5 kg-m, 54 Ib-ft)

6 x 1.0 mm

10 N .
m (1.0 kg-m, 7 Ib-ft)

8 x
1.25
mm

22 N .
m
(2.2 kg-m,

16 Ib-ft) HALF SHAFT
SUPPORT BASE

(cont'd)

HALF SHAFT
HEAT COVER

8 x
1.25
mm

22 N
.
m
(2.2 kg-m,

16 Ib-ft)
A/C BRACKET

HALF SHAFT

10 x
1.25
mm

45 N .
m
(4.5 kg-m,

33 Ib-ft)

ALTERNATOR

BRACKET

STIFFENER

8 x
1.25
mm

22 N
.
m
(2.2 kg-m,

16 Ib-ft)
8x
1.25
mm

22 N .
m
(2.2 kg-m,

16 Ib-ft)
10 x
1.25
mm

45 N .
m
(4.5 kg-m,

33 Ib-ft)

ALTERNATOR

BRACKET

8 x
1.25
mm

22 N .
m
(2.2 kg-m,

16 Ib-ft)ProCarManuals.com

Engine Removal/Installation

(cont'd)

Sub-frame Torque Value Specifications:

RIGHT REAR

BRACKET

10 x
1.25
mm

60 N .
m
(6.0 kg-m.

43 Ib-ft)
LEFT REAR

BRACKET

10 x
1.25
mm

60 N .
m
(6.0 kg-m

43 Ib-ft)

10 x 1.25mm

60 N .
m (6.0 kg-m, 43 Ib-ft)
CORROSION RESISTANT BOLT/NUT

12 x
1.25
mm
95 N.m (9.5 kg-m, 69 Ib-ft)

10 x
1.25
mm

60 N .
m (6.0 kg-m, 43 Ib-ft)
ROD A

10 x
1.25
mm

60 N .
m
(6.0 kg-m,
43 Ib-ft)

FRONT BEAM
REAR BEAM

12 x
1.25
mm

95 N .
m

(9.5 kg-m,
69 Ib-ft) ROD B

10 x
1.25
mm

60 N .
m (6.0 kg-m, 43 Ib-ft)
CENTER RODProCarManuals.com