a01456e77e5298e22f23801cc9314758701646498f7cfa83a6a6bba090ac9dbf

nsxb10002a.pdf

Cooling
Illustrated Index
System is under high pressure when the
engine is hot. To avoid danger of releasing scalding
engine coolant, remove the cap only when the engine is
cool.
Total Cooling System Capacity: Including expansion
tank 2.1 (2.2 US qt. 1.8 Imp qt)
5 M/T: 16.0 (17.0 US qt, 14.1 Imp qt)
4 A/T: 16.5 (17.4 US qt, 14.5 Imp qt)
NOTE:
• Check all cooling system hoses for damage,
leaks or deterioration and replace if necessary.
• Check all hose clamps and retighten if
necessary.
• Use new O-rings when reassembling.
Radiator, Water Pipes and Hoses:
BLEED BOLT
10 N-m (1.0 kg-m,
7 Ib-ft)
WASHER
Replace.
HEATER PIPE
RADIATOR
LOWER HOSE
RADIATOR
UPPER HOSE
RADIATOR
Engine coolant refilling and
bleeding, page 10-5
Leak test, page 10-8
Inspect soldered joints and
seams for leaks.
Blow out dirt from between
core fins with compressed air.
If insects, etc., are clogging
radiator, wash them off with
low-pressure water.
BLEED PLUG
RESISTOR
RADIATOR DRAIN
PLUG
FRONT LOWER
WATER PIPE
FRONT UPPER
WATER PIPE
FAN SHROUD
5 x 0.8 mm
4.5 N-m (0.45 kg-m, 3.3 Ib-ft)
Replace.
BLEED BOLT
10 N-m (1.0 kg-m,
7 Ib-ft)
WASHERS
Replace.
WATER PIPE
DRAIN BOLTS
15 N-m (1.5 kg-m, 11 Ib-ft)
WATER
PIPE ASSEMBLY
WASHER
Replace.
FAN MOTOR

EXPANSION TANK
Refilling and bleeding, page 10-5
Leak Test, page 10-8
ENGINE OIL
COOLER PIPE
AUTOMATIC TRANSMISSION
FLUID (ATF) COOLER
ENGINE
OIL COOLER
CAP
Test, page 10-8

Attachments

a6276e851d22dbc7da9befbd6911e937a4bf29ccafe87ee72931f19e88368d51

nsxb10011a.pdf

Inspection Replacement
1. Remove the timing belt (see page 6-15) (’91-’93) or
(’94-’96).
2. Check that the water pump pulley turns counterclock-
wise.
3. Check for signs of seal leakage.
NOTE: A small amount of “weeping” from the bleed
hole is normal.
Turns counterclockwise
BLEED HOLEBLEED HOLE
1. Remove the timing belt (see page 6-15 (’91-’93) or
(’94-’96).
2. Unscrew the bolts, then remove the water pump.
NOTE: Inspect and clean the 0-ring groove and
mating surface with the cylinder block.
DOWEL PIN
SPECIAL BOLTS
6 x 1.0 mm: 7 BOLTS
12 N·m
(1 .2 kg-m, 9 Ib-ft)
Replace,
WATER PUMP 0-RINGReplace.
SPECIAL BOLTS
8 x 1.25 mm: 2 BOLTS
22 N·m (2.2 kg-m,
16 Ib-ft)
Replace.
3. Install the water pump in the reverse order of
removal.
NOTE:
Keep the 0-ring in position when installing.
Clean up spilled engine coolant.

Attachments

efed8f8e2568186e32ae5ac6e91f31595c38cf4ab86f21f98b1f3a505e7f59e7

nsxb10005a.pdf

Engine Coolant Refilling and Bleeding
CAUTION: When pouring engine coolant, be sure to
shut the relay box lid and not let coolant spill on the
electrical parts or the paint. If any coolant spills, rinse it
off immediately.
NOTE:
• Perform this maintenance when the engine is cool.
• Before replacing the coolant, turn the ignition ON,
slowly turn the climate control temperature knob to
90° and turn off the ignition. This will allow the
coolant in the heater to drain out with the rest of the
system.
1. Open the hood, the rear window and the engine
cover.
2. Remove the cover protecting the water pipes and
shift cables on the underside of the car.
3. Before removing the expansion tank cap, first
loosen the cap to lower pressure.
CAUTION: Do not remove the expansion tank cap
when engine is hot. The coolant is under pressure
and may blow out and scald you. Open the cap
slowly when the engine is cool.
4. Loosen the drain plug in the bottom of the radiator,
and drain the coolant.
5. Remove the two drain bolts from the water pipes,
and drain the coolant.
WASHERS
Replace.
DRAIN BOLTS
15 N-m (1.5 kg-m, 11 Ib-ft)
DRAIN HOLE
DRAIN PLUG

Radiator
Engine Coolant Refilling and Bleeding
6. Install rubber hoses on the drain bolts at the front
and rear of the engine under the cylinder banks.
Loosen the drain bolts to drain the coolant.
• Draining can be done more quickly if all the bleed
bolts and plug are also opened. Before opening
them, make sure the coolant level in the expan-
sion tank has come down completely so that the
coolant will not pour out of the bleed bolts and
plug.
7. When the coolant stops draining, tighten the
radiator drain plug, water pipe drain bolts and
engine drain bolts.
• Be sure to replace the water pipe drain bolt
washers with new ones.
REAR ENGINE DRAIN BOLT
30 N-m (3.0 kg-m, 22 Ib-ft)
8. Open all four bleeders.
1) Loosen the radiator bleed plug.
2) Remove the heater pipe bleed bolt.
3) Loosen the water pipe bleed bolt.
4) Loosen the engine bleed bolt on the thermo
cover.
9. Mix the recommended antifreeze/coolant with an
equal amount of water in a clean container.
NOTE:
• Use only Honda-recommended anti-freeze/
coolant.
• For best corrosion protection, the coolant con-
centrations must be maintained year-round at
50% minimum. Coolant concentrations less than
50% may not provide sufficient protection
against corrosion or freezing.
• Coolant concentrations greater than 60% will
impair cooling efficiency and are not recom-
mended.
CAUTION:
• Do not mix different brands of anti-
freeze/coolant.
• Do not use additional rust inhibitors or anti-rust
products; they may not be compatible with the
recommended coolant.
Engine Coolant Refill Capacity: Including expansion
tank 2.1 (2.2 US qt, 1.8 Imp qt)
Manual: 12.0 (12.7 US qt, 10.6 Imp qt)
Automatic: 12.0 (12.7 US qt, 10.6 Imp qt)
FRONT ENGINE DRAIN BOLT
30 N-m (3.0 kg-m, 22 Ib-ft)

10. Fill the expansion tank with engine coolant. As
coolant starts to run out in a steady stream without
bubbles, tighten the bleeders in sequence: thermo
cover bleed bolt, radiator bleed plug, heater pipe
bleed and water pipe bleed bolt.
11. After tightening all the bleeding bolts and plug, fill
the expansion tank with coolant up to the MAX line.
12. Loosen the thermo cover bleed bolt to remove any
remaining air.
13. When bleeding is completed, retighten the thermo
cover bleed bolt and fill the expansion tank up to
0.5 (0.53 US qt, 0.44 Imp qt) or 30 mm (1.2 in)
over the MAX line.
14. Install the expansion tank cap, and turn it 60 degrees
(where it engages the first lock tab of filler neck).
1 5. Start the engine, and let it run until warmed up (until
the thermostat opens and the radiator cooling fan
runs).
16. Turn off the engine. Check the expansion tank and,
if needed, add engine coolant to bring it up to the
MAX line.
17. Tighten the expansion tank cap securely.
18. Reinstall the cover on the car’s underside.
THERMO COVER
BLEED PLUG
RADIATOR UPPER
TANK
HEATER PIPE
BLEED BOLT
10 N-m (1.0 kg-m,
7 Ib-ft)
BLEED BOLT
10 N-m (1.0 kg-m,
7 Ib-ft)
BLEED BOLT
10 N-m (1.0 kg-m,
7 Ib-ft)

Attachments

481ebfc9617df5212fc73c0bf62095d81e84af4c7336091acd19176f57858ca3

nsxb10009a.pdf

Thermostat
Replacement
NOTE: Use new gaskets and O-rings when reassem-
bling.
ENGINE COOLANT
TEMPERATURE (ECT) GAUGE
SENDING UNIT
9 N-m (0.9 kg-m, 7 Ib-ft)
Apply liquid gasket
to the threads.
WATER PASSAGE
8 x 1.25 mm
22 N-m (2.2 kg-m,
16 Ib-ft)
BLEED BOLT
10 N-m (1.0 kg-m, 7 Ib-ft)
6 x 1.0 mm
12 N-m (1.2 kg-m,
9 Ib-ft)
ECT SWITCH
18 N-m (1.8 kg-m,
13 Ib-ft)
8 x 1.25 mm
22 N-m (2.2 kg-m, 16 Ib-ft)
THERMO COVER
O-RING Replace.
Testing
Replace thermostat if it is open at room temperature.
To test a closed thermostat:
1. Suspend the thermostat in a container of water as
shown.
2. Heat the water, and check the temperature with a
thermometer. Check the temperature at which the
thermostat first opens and at full lift.
CAUTION: Do not let thermometer touch the bottom
of the hot container.
3. Measure lift height of the thermostat when fully open.
STANDARD THERMOSTAT
Lift height: above 10 mm (0.39 in)
Starts opening: 169-176°F (76-80°C)
Fully open: 194°F (90°C)
THERMOMETER
THERMOSTAT
THERMOSTAT
Install with pin up.

Attachments

7c62a3f03646ede703d66f1f2701e8645fa106d41204901392bb9b2abf1f41e7

nsxb10010a.pdf

Water Pump
Illustrated Index
NOTE: Use new O-rings and new special bolts when
reassembling.
8 x 1.25 mm
22 N-m (2.2 kg-m
16 Ib-ft)
ECT SWITCH
18 N-m (1.8 kg-m,
13 Ib-ft)
ENGINE COOLANT
TEMPERATURE (ECT)
GAUGE SENDING UNIT
9 N-m (0.9 kg-m,
7 Ib-ft)
Apply liquid gasket
to the threads.
BLEED BOLT
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)
O-RING
Replace.
DRAIN BOLTS
10 N-m (1.0 kg-m, 7 Ib-ft)
Use rubber hoses
when draining.
SPECIAL BOLT
8 x 1.25 mm: 2 BOLTS
22 N-m (2.2 kg-m, 16 Ib-ft)
Replace.
DOWEL PIN
O-RING
Replace.
WATER PUMP
Inspection, page 10-11 DOWEL
PIN
SPECIAL BOLT
6 x 1.0 mm: 7 BOLTS
12 N-m (1.2 kg-m, 9 Ib-ft)
Replace.
WATER PASSAGE
O-RINGS
Replace.
CONNECTING PIPE

Attachments

9ab4886abf31bdf1ebaf25e786f3ab8ac02a94239bbb624e175e7cf7766759ab

nsxb10004a.pdf

Radiator
Replacement
1. Remove the spare tire.
2. Drain the radiator (see page 10-5 thru 10-7).
3. Disconnect the fan motor connector and the
resistor connector.
4. Remove the upper and lower hoses from the
radiator.
5. Remove the bracket and the radiator.
Install the radiator in the reverse order of removal:
NOTE:
• Set the upper and lower cushions securely.
• Fill the radiator and bleed the air (see page 10-5
thru 10-7).
6 x 1.0 mm
10 N-m (1.0 kg-m, 7 Ib-ft)
RADIATOR BRACKET
UPPER CUSHIONS
RESISTOR CONNECTOR
FAN MOTOR
CONNECTOR
RESISTOR CONNECTOR
LOWER CUSHIONS
FAN MOTOR
CONNECTOR
UPPER HOSE
LOWER HOSE

Attachments

f7957d1b4fe60bf9a53163b04e2c0f3850be9777e36ae6c0035437dd907d4a1d

nsxb10008a.pdf

Expansion Tank
Cap Testing
1. Remove the expansion tank cap, wet its seal with
engine coolant, then install it on the pressure
tester.
2. Apply a pressure of 95-125 kPa (0.95-1.25
kg/cm2, 14-18 psi).
3. Check for a drop in pressure. PRESSURE TESTER
ADAPTOR
(for 32 mm neck)
EXPANSION TANK
CAP
Testing
1. Wait until the engine is cool, then carefully remove
the expansion tank cap and fill the expansion tank
with engine coolant to the top of the filler neck.
2. Attach the pressure tester to the expansion tank,
and apply a pressure of 95 – 125 kPa (0.95 – 1.25
kg/cm2, 14- 18 psi).
3. Inspect for coolant leaks and a drop in pressure.
4. Remove the tester, and reinstall the expansion tank
cap.
NOTE: Check for engine oil in the coolant and/or
coolant in the engine oil.
PRESSURE TESTER
EXPANSION TANK
ADAPTOR
(for 32 mm neck)

Attachments