1991 ACURA NSX Service Repair Manual

Pressure Testing

A/T LOW PRESSURE A/T OIL PRESSUREGAUGE W/PANEL HOSE ADAPTER

07406–0070300 07MAJ–PY40120
1. Allow the rear wheels to rotate freely.

2. Run the engine at 2,000 rpm.

3. Shift the select lever as shown on the chart on
the next page.
4. Measure each clutch pressure.
While testing, be careful of the rotating
rear wheels.

4. Start the engine and measure the respective pressure
as follows.
Line Pressure/Clutch Pressure
Clutch Low/High Pressure
Throttle B Pressure

5. Install a new washer and the sealing bolt in the
inspection hole and tighten to the specified torque.

Torque: 18 N .
m (1.8 kg-m, 13 Ib-ft)

NOTE: Do not reuse old aluminum washers.

While testing, be careful of the rotating rear wheels.
Make sure lifts are placed properly (see section 1).
CAUTION: Before testing, be sure the transmission fluid is filled
to the proper level.
Warm up the engine before testing.
1. Raise the car. (see section 1).
2. Warm up the engine, then stop the engine and connect a tachometer.
3. Connect the oil pressure gauge to each inspection
hole(s).

18 N .
m (1.8 kg-m, 12 Ib-ft)
CAUTION: Connect the oil pressure gauge
securely, being sure not to allow dust and other
foreign particles to enter the inspection hole.

A/T PRESSURE A/T PRESSURE
GAUGE SET W/PANEL HOSE, 2210 mm
07406–0020400 07MAJ–PY4011A Line Pressure/Clutch Pressure MeasurementProCarManuals.com

1ST-HOLD CLUTCH PRESSURE

INSPECTION HOLE

2ND CLUTCH PRESSURE

INSPECTION HOLE

4TH CLUTCH PRESSURE

INSPECTION HOLE

LINE PRESSURE/ 1ST CLUTCH

PRESSURE INSPECTION HOLE

3RD CLUTCH PRESSURE

INSPECTION HOLE

(cont'd)ProCarManuals.com

Pressure Testing

(cont'd)

Clutch Low/High Pressure Measurement

While testing, be careful of the rotat-

ing rear wheels.

-1. Allow the rear wheels to rotate freely.

-2. Start the engine and let it idle.

-3. Shift the select lever to position.

-4. Slowly press down the accelerator pedal to in-

crease engine rpm until pressure is indicated on

the oil pressure gauge. Then release the acceler-

ator pedal, allowing the engine return to an idle,

and measure the pressure reading.
-5. With the engine idling, press down the acceler-

ator pedal approximately 1/2 of its possible trav-

el and increase the engine rpm until pressure is

indicated on the gauge, measure the highest

pressure reading obtained.

-6. Repeat steps-4 and -5 for each clutch pressure

being inspected.

2ND CLUTCH PRESSURE

INSPECTION HOLE

3RD CLUTCH PRESSURE

INSPECTION HOLE
4TH CLUTCH PRESSURE

INSPECTION HOLEProCarManuals.com

LINEAR SOLENOID
THROTTLE B

INSPECTION HOLE
LINEAR SOLENOID

CONNECTOR
View from terminal side.
LINEAR SOLENOID
Throttle B Pressure Measurement

While testing, be careful of the rotat-

ing rear wheels.

-1. Allow the rear wheels to rotate freely.

-2. Disconnect the linear solenoid connector.

-3. Shift the select lever to position.

-4. Run the engine at 1,000 rpm.

-5. Measure full opened throttle B pressure.

-6. Connect battery voltage to the linear solenoid ter-

minal of the connector.

-7. Measure full closed throttle B pressure.

PRESSUREProCarManuals.com

Transmission
Removal
Make sure lifts are placed properly, and

hoist brackets are attached to correct position (see sec-

tion 1).
CAUTION: Use fender covers to avoid damaging painted

surfaces.

1. Check and record the rear camber. (see section 18.)
2. Disconnect the battery negative (-) first, and positive (+) cable from the battery.
3. Drain automatic transmission fluid (ATF). Reinstall the drain plug with a new washer.
NOTE: Removing the ATF level gauge will allow the
ATF to drain more rapidly. 4. Remove the strut bar.
5. Remove the air cleaner housing.
6. Remove the connectors from the control box and remove the control box (see section 11).
CAUTION: Do not remove the vacuum tubes from
the control box.
7. Remove the wire harness holder, disconnect the vehicle speed sensor (VSS) wire connectors,
solenoid valve wire connectors, starter motor
cables and transmission ground cable.
8. Remove the ATF cooler as it is connected by the
hoses.

CAUTION: Do not remove the hoses from the ATF

cooler.

9. Remove the starter motor mounting bolts, then remove the starter motor.
10. Remove the transmission housing bolts and the transmission mounting bolts.
MAINSHAFT SPEED SENSOR
CONNECTOR
LOCK-UP CONTROL
SOLENOID VALVE
CONNECTOR
STARTER MOTOR
TRANSMISSION

HOUSING BOLTS
CONTROL BOX
STARTER MOTOR
STARTER MOTOR
MOUNTING BOLT
ATF COOLER
ATF COOLER FILTER/GASKET Replace.

VSS

CONNECTOR
COUNTERSHAFT SPEED SENSOR
CONNECTOR
LINEAR SOLENOID
CONNECTOR

SHIFT CONTROL

SOLENOID VALVE
CONNECTOR
GROUND CABLE
TRANSMISSION

MOUNTING BOLTS
TRANSMISSION

HANGER
Corrosion resistant bolt/nut

CABLEProCarManuals.com

(cont'd)
11. Remove the parking brake cable holders from the rear beam rod.

12. Remove the rear beam rod.

13. Remove the front exhaust pipe A.

PARKING BRAKE

CABLE HOLDER
PARKING BRAKE

CABLE
Corrosion resistant bolt/nut

Replace.
SELF-LOCKING NUT

REAR BEAM ROD
GASKET

Replace.

SELF-LOCKING NUT

Replace.

FRONT EXHAUST

PIPE A

14. Remove the parking brake cable holder and the wheel sensor wire clamp.

15. Make a reference mark on the flange of the adjusting bolt, adjusting cam and lower control arm.

16. Separate the toe control arm from the side beam.

17. Remove the damper fork bolt.

18. Separate the lower control arm from the side beam.

19. Remove the right driveshaft from the intermediate shaft.

DAMPER FORK BOLT

PARKING BRAKE

CABLE HOLDER

WHEEL SENSOR

WIRE CLAMP

LOWER CONTROL ARM

SELF-LOCKING NUT

Replace.
SIDE BEAM

TOE CONTROL ARM

SELF-LOCKING

NUT

Replace.

ADJUSTING BOLT
ADJUSTING CAM
Corrosion resistant bolt/nutProCarManuals.com

Transmission

Removal (cont'd)

20. Remove the intermediate shaft heat cover and the intermediate shaft mounting bolts.

21. Pry the intermediate shaft out of the differential. Pull and remove it.

NOTE:

INTERMEDIATE SHAFT

INTERMEDIATE SHAFT

HEAT COVER

INTERMEDIATE SHAFT

MOUNTING BOLT
SET RING

Replace.

INTERMEDIATE SHAFT

22. Remove the parking brake cable holder and the wheel sensor wire clamp.

23. Make a reference mark on the flange of the adjusting bolt, adjusting cam and lower control arm.

24. Separate the toe control arm from the side beam.

25. Remove the damper fork bolt.

26. Separate the lower control arm from the side beam.

27. Pry the driveshaft out of the differential. Pull and remove it.

NOTE:

TOE CONTROL ARM

DAMPER FORK BOLT

PARKING BRAKE

CABLE HOLDER

SIDE BEAM

SET RING

Replace.

SELF-LOCKING NUT

Replace.
ADJUSTING

CAM
ADJUSTING

BOLT
SELF-LOCKING

NUT

Replace.
LOWER CONTROL

ARM
WHEEL SENSOR

WIRE CLAMP
SUPPORT BASE
Coat all precision finished surfaces with clean engine oil or grease.

Tie plastic bags over the driveshaft ends.

Coat all precision finished surfaces with clean engine oil or grease.

Tie plastic bags over the driveshaft ends.ProCarManuals.com

28. Remove the one bolt of the upper arm mounting bolts.
29. Remove the shift cable cover and shift cable holder.
30. Remove the shift cable from the control lever.
31. Remove the torque converter cover and then remove the drive plate bolts.
DRIVE PLATE
DAMPER
UPPER CONTROL

ARM

SHIFT

CABLE

SHIFT CABLE

HOLDER

SHIFT CABLE

COVER

CONTROL

LEVER

TORQUE CONVERTER

COVER

UPPER ARM MOUNTING

BOLT

32. Attach a chain hoist to the transmission hangers.
33. Place a jack under the transmission and raise the transmission just enough to take weight off of the mounts.34. Remove the front engine mounting bolts on the transmission side and retighten the bolt on the engine side.
CAUTION: Loosen the front engine mounting bolt on the engine side, but do not remove it. After removing the
two bolts on the transmission side, be sure to retighten the bolt on the engine side.
35. Remove the rear transmission mounting bolts.
36. Remove the transmission housing mounting bolts..
37. Pull the transmission away from the engine until it clears the dowel pins, then lower it on the transmission jack.
TRANSMISSION HOUSINGMOUNTING BOLT
FRONT ENGINE MOUNTINGBOLT (Engine side)
FRONT ENGINE MOUNTING
BOLTS (Transmission side)
FRONT ENGINE MOUNT
TRANSMISSION HOUSING MOUNTING BOLT
TRANSMISSION JACK
REAR TRANSMISSION
MOUNTING BOLT REAR TRANSMISSION

MOUNTProCarManuals.com