transmission fluid ACURA NSX 1991 Service Repair Manual
[x] Cancel search | Manufacturer: ACURA, Model Year: 1991, Model line: NSX, Model: ACURA NSX 1991Pages: 1640, PDF Size: 60.48 MB
Page 27 of 1640
Lubrication Points
For the details of lubrication points and types of lubricants to be applied, refer to the Illustrated Index and various work
procedures (such as Assembly/Reassembly, Replacement, Overhaul, Installation, etc.) contained in each section.
*1: If Honda MTF is not available, you may use an API service SG or SH-rated motor oil with a viscosity of SAE
10 W-30 or 10 W-40 temporarily. Motor oil can cause increased transmission wear and higher shifting effort, so you
should have the transmission drained and refilled with Honda MTF as soon as possible. The transmission should be
drained and refilled with new fluid according to the time and distance recommendations in the maintenance schedule.ProCarManuals.com
Page 72 of 1640
9. Relieve fuel pressure by loosening the service bolt
on the fuel filter about one turn (see section 11).
Do not smoke while working on the
fuel
system.
Keep open flame away from work
area. Drain fuel only into an approved container.
10. Remove the fuel feed pipe and fuel return hose.
11. Remove the wire harness cover, then remove the fuel pipe clamp.
22 N·m
(2.2 kg-m,
16 Ib-ft)
WIRE HARNESS
COVER
6 x 1.0 mm
12 N·m
(1.2 kg-m,
9 lb-ft)
FUEL FEED
PIPE
WASHERS
Replace.
FUEL RETURN
HOSE
12. Remove the brake booster vacuum hose and evapo- rative emission (EVAP) control canister hose.
BRAKE BOOSTER
VACUUM HOSE
EVAP CONTROL
CANISTER HOSE
13. Remove the expansion tank cap.
14. Raise the hoist to full height.
15. Drain the engine coolant (see page
10-5).
Loosen the drain plug from the radiator lower
tank. Remove two drain bolls from the water pipes.
Reinstall the drain bolts with new washers.
Loosen the front and rear engine drain bolts to
drain engine coolant from the cylinder heads.
Connect rubber hoses to the drain bolts.
16. Drain the transmission oil/fluid. Reinstall the drain plug with a new washer.
17. Drain the engine oil. Reinstall the drain plug with a
new washer.
18. Lower the hoist, then remove the air cleaner hous-
ing (see page 6-25 ('91-'93 Mode ls),or('95-'96 Models).
19. Disconnect two hoses, then remove the expansion
tank.
6 x 1.0 mm
10 N·m
11.0 kg-m,
7 lb-ft)
EXPANSION
TANK
WATER BYPASS
HOSES
(cont'd)ProCarManuals.com
Page 80 of 1640
5. Install the side engine mount, then tighten the bolts
in the numbered sequence as shown ( - ),
12 x
1.26
mm
73 N·m
(7.3 kg-m,
53 Ib-ft)
Replace.
12 x
1.25
mm
95 N·m
(9.5 kg-m,
69 Ib-ft)
SIDE ENGINE
MOUNT
6. Tighten the transmission mount mounting bolt.
MOUNTING BOLT
12 x
1.25
mm
95 N·m (9.5 kg-m, 69 Ib-ft)
7. Tighten the rear mount mounting bolt.
MOUNTING BOLT
12 x
1.25
mm
77 N·m (7.7 kg-m, 56 Ib-ft)
Replace.
Check that the spring clip on the end of each
driveshaft clicks into place.
CAUTION: Use new spring clips.
Bleed air from the cooling system (see page 10-5).
Bleed air from the brake lines {see section 19).
Check the clutch pedal free play (see section 12).
Adjust the clutch guide assemblies when disas-
sembling clutch (see section 12).
Check that the transmission shifts into gear
smoothly.
Adjust the alternator belt (see section 23).
Adjust the A/C compressor belt (see section 22).
Clean battery posts and cable terminals with
sandpaper, assemble, then apply grease to pre-
vent corrosion.
Inspect for fuel leakage (see section 11). After assembling the fuel line parts, turn on
the ignition switch (do not operate the starter) so that the fuel pump operates for approxi-
mately two seconds and the fuel line pressu-
rizes. Repeat this operation two or three times
and check for fuel leakage at any point in the
fuel line.
Check and adjust wheel alignment (see section 18).
Refill the engine with engine oil (see page 8-4 ('91-'92
Models), ('93-Model),or ('94-'96 Models).
Refill the transmission with oil/fluid (see section
13 or
14).ProCarManuals.com
Page 973 of 1640
Lubrication Points
For the details of lubrication points and types of lubricants to be applied, refer to the Illustrated Index and various workprocedures (such as Assembly/Reassembly, Replacement, Overhaul, Installation, etc.) contained in each section.
No.
LUBRICATION POINTS
LUBRICANT
Engine
Transmission
Manual
Automatic
Brake Line (including anti-lock brake system)
Clutch Line Shift lever pivots (M/T)Release fork (M/T)Steering gearbox (Manual)
Steering boots Steering column bushings
Steering ball jointsSelect lever (A/T)
Pedal linkage Intermediate shaft
Brake master power pushrod
Trunk hinges Door hinges upper and lower
Door opening detents
Fuel filler lid
Front hood hinges and latch
Clutch master cylinder pushrod
Tilt lever
Parking brake cable end
Throttle cable end Rear hatch latchRetractable headlight pin contact area
Shift cable end and select cable end
Caliper Piston seal, Dust seal, Caliper pin, Piston
Recommended Engine Oil
API Service Grade: SG Fuel Efficient Oil:
Identified by the words, "Energy Conserving II" API Service Grade: SG
SAE viscosity: 10 W—30 recommended
Fuel Efficient Oil:
Identified by the words, "Energy Conserving II"
SAE Viscosity: See chart below.
API Service Grade: SF or SG SAE Viscosity: See chart below.
Honda Premium Formula Automatic Transmission
Fluid or an equivalent DEXRON® II type automatic
transmission fluid
Brake fluid DOT3 or DOT4
Brake fluid DOT3 or DOT4
Silicone grease with molybdenum disulfide
Multi-purpose grease
Silicone grease Recommended Manual Transmission Oil
API Service Grade: SF or SG
transmission oil viscosity forambient temperature ranges
Engine oil viscosity for
ambient temperature rangesProCarManuals.com
Page 986 of 1640
Engine Removal/Installation
Make sure jacks and safety stands are placed proper-ly and hoist brackets are attached to the correct
positions on the engine (see section 1).
Make sure the car will not roll off stands and fall
while you are working under it. 3. Remove the expansion tank cap to speed draining.
Use care when removing the expan-
sion tank cap to avoid scalding by hot engine
coolant or steam.
4. Raise the hoist to full height.
5. Drain the engine coolant (see section 10).
STRUT BAR
10 x
1.25
mm
39 N.m (3.9 kg-m, 28 Ib-ft)
EXPANSION TANK
CAP
: CORROSION RESISTANT BOLT
(cont'dj
1. Move the seat bottoms and backs as far forward as
they will go.
2. Disconnect the battery negative terminal first, then
the positive terminal.
Loosen the drain plug from the radiator lower
tank.
Remove two drain bolts from the water pipes
Reinstall the drain bolts with new washers.
Loosen the front and rear engine drain bolts to
drain engine coolant from cylinder heads. Con-
nect rubber hoses to the drain bolts.
6. Drain transmission oil/fluid. Reinstall the drain plug using a new washer.
CAUTION: Do not overtighten the drain plug.
7. Drain the engine oil. Reinstall the drain plug using a new washer.
8. Lower the hoist.
9. Remove the strut bar.
CAUTION:
Use front and rear fender covers to avoid damaging
painted surfaces.
Unspecified items are common.Unplug the wiring connectors carefully while holding
the coupler and the connector portion to avoid damage.
Mark all wiring and hoses to avoid mis-connection.
Also, be sure that they do not contact other wiring or hoses or interfere with other parts.
If the ground clearance needs to be increased, use a
scissors jack and install the rubber spacers to the coil
springs (page 1-8).
Put rubber pads under the jacking points when using
jacks or safety stands to avoid damaging the body (page 1-9 to 11).ProCarManuals.com
Page 1165 of 1640
Description
The automatic transmission is a combination of a 3-element torque converter and a triple-shaft electronically controlled
automatic transmission which provides 4 speeds forward and 1 in reverse. The entire unit is positioned in line with the
engine.
TORQUE CONVERTER, GEARS AND CLUTCHES
The torque converter consists of a pump, turbine and stator, assembled in a single unit.
They are connected to the engine crankshaft so they turn together as a unit as the engine turns.
Around the outside of the torque converter is a ring gear which meshes with the starter pinion when the engine is being
started. The entire torque converter assembly serves as a flywheel while transmitting power to the transmission mainshaft.
The transmission has three parallel shafts, the mainshaft, the countershaft, and the secondary shaft. The mainshaft is
in line with the engine crankshaft.
The mainshaft includes the clutches for 1st, and 4th, and gears for 3rd, 4th, Reverse and 1st (3rd gear is integral with
the mainshaft, while reverse gear is integral with 4th gear).
The countershaft includes the clutches for 1st-Hold and 3rd, and gears for 2nd, 3rd, 4th, Reverse and 1st.
The secondary shaft includes the 2nd clutch and gears for 2nd and 3rd.
The 4th and reverse gears can be locked to the countershaft at its center, providing 4th gear or Reverse, depending on
which way the selector is moved.
The gears on the mainshaft and secondary shaft are in constant mesh with those on the countershaft.
When certain combinations of gears in the transmission are engaged by clutches, power is transmitted from the main-
shaft to the countershaft to provide , , , and
ELECTRONIC CONTROL
The electronic control system consists of the Transmission Control Module (TCM), sensors, a linear solenoid and 4
solenoid valves. Shifting and lock-up are electronically controlled for comfortable driving under all conditions.
The TCM is located on the insulator center bulkhead, behind the driver's seat.
HYDRAULIC CONTROL
The valve bodies include the main valve body, secondary valve body, servo body, regulator valve body, throttle valve
body, lock-up valve body and the 2nd accumulator body.
They are bolted to the torque converter housing as an assembly.
The main valve body contains the manual valve, 1-2 shift valve, 2-3 shift valve, 3-4 shift valve, relief valve, one-way
relief valve and oil pump gears.
The secondary valve body contains the 3-2 kick-down valve, CPC (clutch pressure control) valve, 2nd orifice control
valve, 3rd orifice control valve, modulator valve, 4th exhaust valve, servo control valve, 2nd exhaust valve and 4-3 kick-
down valve.
The servo body contains the accumulator pistons and servo valve. The throttle valve body includes the throttle valve B
which is bolted onto the servo body.
The regulator valve body contains the pressure regulator valve, lock-up control valve and cooler relief valve. Fluid from
the regulator passes through the manual valve to the various control valves.
The lock-up valve body contains the lock-up timing B valve and lock-up shift valve. The 2nd accumulator body contains
the accumulator pistons and limited slip differential (LSD) relief valve.
The torque converter check valve is located in the torque converter housing, under the main valve body.
The 1st, 1st-hold, 3rd and 4th clutches receive oil from their respective feed pipes.
SHIFT CONTROL MECHANISM
Input from various sensors located throughout the car determines which shift control solenoid valve the TCM will ac-
tivate. Activating a shift control solenoid valve changes modulator pressure, causing a shift valve to move. This
pressurizes a line to one of the clutches, engaging that clutch and its corresponding gear.
LOCK-UP MECHANISM
In position and position in 2nd, 3rd and 4th, pressurized fluid is drained from the back of the torque converter
through an oil passage, causing the lock-up piston to be held, against the torque converter cover. As this takes place, the
mainshaft rotates at the same speed as the engine crankshaft. Together with hydraulic control, the TCM optimizes the
timing of the lock-up mechaism.
The lock-up valves control the range of lock-up according to lock-up control solenoid valves A and B, and throttle valve B.
When lock-up control solenoid valves A and B activate, modulator pressure changes. The lock-up control solenoid valves
A and B are mounted on the torque converter housing, and are controlled by the TCM.
(cont'd)ProCarManuals.com
Page 1190 of 1640
As the engine turns, the oil pump also starts to operate. Automatic transmission fluid (ATF) is drawn from (99) and
discharged into (1). Then, ATF pressure is controled by the regulator valve and becomes line pressure (1). The torque
converter inlet pressure (92) enters (94) of torque converter through the orifice and discharges into (90).
The torque converter check valve prevents the torque converter pressure from rising.
Under this condition, the hydraulic pressure is not applied to the clutches.
(cont'd)
positionProCarManuals.com
Page 1224 of 1640
Fluid Level
Checking/Changing
Checking
NOTE: Check the fluid level with the engine at nor-
mal operating temperature (the cooling fan comes
on).
1. Park the car on level ground. Turn off the engine.
2. Remove the dipstick (yellow loop) from the
transmission, and wipe it with a clean cloth.
NOTE: Check the fluid level for to 90 seconds
from 60 seconds after the engine had shut off.
3. Insert the dipstick into the transmission.
4. Remove the dipstick, and check the fluid level. It
should be between the upper and lower marks.
5. If the level is below the lower mark, add fluid into
the tube to bring it to the upper mark. Use Honda
Premium Formula Automatic Transmission Fluid or
an equivalent DEXRON® II Automatic Transmission
Fluid (ATF) only.
6. Insert the dipstick back into the transmission.
UPPER
LOWER
DIPSTICK
(YELLOW LOOP)
DRAIN PLUG
50 N·m (5.0 kg-m, 36 Ib-ft)
SEALING WASHER
Replace.
Changing
1. Bring the transmission up to operating temperature
by driving the car. Park the car on level ground, turn
the engine off, then remove drain plug.
2. Reinstall the drain plug with a new washer, then refill
the transmission to the full mark on the dipstick.
Automatic Transmission Fluid Capacity:
2.9 (3.1 US qt., 2.6 Imp. qt.) at change
7.0 (7.4 US qt., 6.2 Imp. qt.) after overhaul
6.3 (6.7 US qt., 5.5 Imp. qt.) after overhaul
with new torque
converter.ProCarManuals.com
Page 1225 of 1640
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
Page 1229 of 1640
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