coolant temperature ACURA CSX 2006 Service Repair Manual

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Cooling System
ItemMeasurement Qualification Standard or New
2-6Standards and Service Limits
Radiator
Coolant capacities (including engine,
heater, hoses, and reservoir)
Use Honda Long Life Antifreeze/
Coolant Type 2
(K20Z2) M/T: engine
overhaul
6.6 L (1.74 US gal)
M/T: coolant
change 4.3 L (1.14 US gal)
A/T: engine
overhaul 6.5 L (1.72 US gal)
A/T: coolant
change 4.2 L (1.11 US gal)
Coolant capacities (includes engine,
heater, hoses, and reservoir)
Use Honda Long Life Antifreeze/
Coolant Type 2
(K20Z3) Engine overhaul 6.8 L (1.80 US gal)
Coolant change 4.5 L (1.19 US gal)
Coolant reservoir Coolant capacity 0.4 L (0.11 US gal)
Radiator cap Opening pressure 93 123 kPa (0.95 1.25 kgf/cm , 14 18 psi)
Thermostat Opening temperature Begins to open 76 80 °C (169 176 °F)
Fully open 90 °C (194 °F)
Valve lift at fully open 8.0 mm (0.31 in.)
2
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Special Tools Required
Valve Clearance
Intake: 0.21 0.25 mm (0.008 0.010 in.)
Exhaust: 0.28 0.32 mm (0.011 0.013 in.)
K20Z2 engine
6-12Cylinder Head
Valve Clearance Adjustment
A
B
C No. 1
No. 2
No. 3No. 4
No. 1 No. 2 No. 3 No. 4
EXHAUST
INTAKE
AB
 Locknut wrench 07MAA-PR70120
 Adjuster 07MAA-PR70110
NOTE: Connector the Honda Diagnostic System (HDS)
to the data link connector (DLC) (see step 2 on page
11-3), and monitor the engine coolant temperature
(ECT) sensor 1 with the HDS. Adjust the valve clearance
only when the engine coolant temperature is less than
38 °C (100 °F). 1. Remove the cylinder head cover (see page 6-36).
2. Set the No. 1 piston at top dead center (TDC). The punch mark (A) on the variable valve timing control
(VTC) actuator and the punch mark (B) on the
exhaust camshaft sprocket should be at the top.
Align the TDC marks (C) on the VTC actuator and
the exhaust camshaft sprocket. 3. Select the correct feeler gauge for the valve
clearance you are going to check.
4. Insert the feeler gauge (A) between the adjusting screw (B) and the end of the valve stem, then slide
it back and forth, you should feel a slight amount of
drag.
08/08/21 14:26:30 61SNR030_060_0012
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Special Tools Required
K20Z3 engine
6-146-14 Cylinder Head
Valve Clearance Adjustment (cont’d)
B
A
C
11. Rotate the crankshaft 180 ° clockwise (camshaft pulley turns 90 °).
12. Check and, if necessary, adjust the valve clearance on the No. 2 cylinder.
13. Install the cylinder head cover (see page 6-37).  Locknut wrench 07MAA-PR70120
 Adjuster 07MAA-PR70110
NOTE: Connect the Honda Diagnostic System (HDS) to
the data link connector (DLC) (see step 2 on page 11-3),
and monitor the engine coolant temperature (ECT)
sensor 1 with the HDS. Adjust the valve clearance only
when the engine coolant temperature is less than 38 °C
(100 °F).
1. Remove the cylinder head cover (see page 6-36).
2. Set the No. 1 piston at top dead center (TDC). The punch mark (A) on the variable valve timing control
(VTC) actuator and the punch mark (B) on the
exhaust camshaft sprocket should be at the top.
Align the TDC marks (C) on the VTC actuator and
the exhaust camshaft sprocket.
08/08/21 14:26:31 61SNR030_060_0014
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6-386-38 Cylinder Head
Cylinder Head Cover Installation
(cont’d)
Cylinder Head Removal
B
C
A
6x1.0mm
10 N·m
(1.0 kgf·m, 7.2 lbf·ft)
6x1.0mm
12 N·m
(1.2 kgf·m, 8.7 lbf·ft) A
B
8. Install two bolts (A) securing the evaporativeemission (EVAP) canister purge valve bracket.
9. Connect the breather hose (B), and install the dipstick (C).
10. Connect the evaporative emission (EVAP) canister purge valve connector.
11. Install the four ignition coils (see page 4-21).
12. Install the engine cover. NOTE:
 Use fender covers to avoid damaging the painted surfaces.
 To avoid damaging the wire and terminals, unplug the wiring connectors carefully while holding the
connector portion.
 Connect the Honda Diagnostic System (HDS) to the data link connector (DLC) (see step 2 on page 11-3),
and monitor the engine coolant temperature (ECT)
sensor 1. To avoid damaging the cylinder head, wait
until the engine coolant temperature drops below
38 °C (100 °F) before loosening the cylinder head
bolts.
 Mark all wiring and hoses to avoid misconnection. Also, be sure that they do not contact other wiring or
hoses, or interfere with other parts.
1. Relieve the fuel pressure (see page 11-322).
2. Drain the engine coolant (see page 10-8).
3. Remove the air cleaner assembly (see page 11-345).
4. Remove the drive belt (see page 4-31).
5. Remove the intake manifold:  K20Z2 engine (see page 9-3)
 K20Z3 engine (see page 9-7)
6. Remove the exhaust manifold (see page 9-11).
7. Disconnect the evaporative emission (EVAP) canister hose (A) and the brake booster vacuum
hose (B).
08/08/21 14:27:27 61SNR030_060_0038
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6-386-38 Cylinder Head
Cylinder Head Cover Installation
(cont’d)
Cylinder Head Removal
B
C
A
6x1.0mm
10 N·m
(1.0 kgf·m, 7.2 lbf·ft)
6x1.0mm
12 N·m
(1.2 kgf·m, 8.7 lbf·ft) A
B
8. Install two bolts (A) securing the evaporativeemission (EVAP) canister purge valve bracket.
9. Connect the breather hose (B), and install the dipstick (C).
10. Connect the evaporative emission (EVAP) canister purge valve connector.
11. Install the four ignition coils (see page 4-21).
12. Install the engine cover. NOTE:
 Use fender covers to avoid damaging the painted surfaces.
 To avoid damaging the wire and terminals, unplug the wiring connectors carefully while holding the
connector portion.
 Connect the Honda Diagnostic System (HDS) to the data link connector (DLC) (see step 2 on page 11-3),
and monitor the engine coolant temperature (ECT)
sensor 1. To avoid damaging the cylinder head, wait
until the engine coolant temperature drops below
38 °C (100 °F) before loosening the cylinder head
bolts.
 Mark all wiring and hoses to avoid misconnection. Also, be sure that they do not contact other wiring or
hoses, or interfere with other parts.
1. Relieve the fuel pressure (see page 11-322).
2. Drain the engine coolant (see page 10-8).
3. Remove the air cleaner assembly (see page 11-345).
4. Remove the drive belt (see page 4-31).
5. Remove the intake manifold:  K20Z2 engine (see page 9-3)
 K20Z3 engine (see page 9-7)
6. Remove the exhaust manifold (see page 9-11).
7. Disconnect the evaporative emission (EVAP) canister hose (A) and the brake booster vacuum
hose (B).
08/08/21 14:27:27 61SNR030_060_0038
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6-40Cylinder Head
Cylinder Head Removal (cont’d)
B
A
12. Remove the bolt (A) securing the connecting pipe.
13. Disconnect the water bypass hose (B).
14. Disconnect the following engine wire harnessconnectors, and remove the wire harness clamps
from the cylinder head.
 Four fuel injector connectors
 Engine coolant temperature (ECT) sensor 1 connector
 Camshaft position (CMP) sensor A (Intake) connector
 Camshaft position (CMP) sensor B (Exhaust) connector
 Rocker arm oil control valve connector
 Rocker arm oil pressure switch connector
 EVAP canister purge valve connector
 Variable valve timing control (VTC) oil control solenoid valve connector
 Exhaust gas recirculation (EGR) valve connector (K20Z2 engine)
 Engine oil pressure switch connector 15. Remove the cam chain (see page 6-18).
16. Remove the rocker arm assembly:
 K20Z2 engine (see page 6-43)
 K20Z3 engine (see page 6-44)
17. Remove the cylinder head bolts. To prevent warpage, loosen the bolts in sequence 1/3 turn at a
time. Repeat the sequence until all bolts are
loosened.
18. Remove the cylinder head.
08/08/21 14:27:28 61SNR030_060_0040
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6-64Cylinder Head
Cylinder Head Installation (cont’d)
B
A
8 x 1.25 mm
22 N·m (2.2 kgf·m, 16 lbf·ft) A
B
A
B
6x1.0mm
12 N·m
(1.2 kgf·m, 8.7 lbf·ft)
12. Install the rocker arm assembly:
 K20Z2 engine (see page 6-60)
 K20Z3 engine (see page 6-61)
13. Install the cam chain (see page 6-21).
14. Connect the following engine wire harness connectors, and install the wire harness clamps to
the cylinder head:
 Four fuel injector connectors
 Engine coolant temperature (ECT) sensor 1 connector
 Camshaft position (CMP) sensor A (Intake) connector
 Camshaft position (CMP) sensor B (Exhaust) connector
 Rocker arm oil control valve connector
 Rocker arm oil pressure switch connector
 EVAP canister purge valve connector
 Variable valve timing control (VTC) oil control solenoid valve connector
 Exhaust gas recirculation (EGR) valve connector (K20Z2 engine)
 Engine oil pressure switch connector
15. Install the bolt (A) securing the connecting pipe.
16. Connect the water bypass hose (B). 17. Connect the upper radiator hose (A) and the heater
hoses (B).
18. Install the harness holder bracket (A), then install the harness holder (B).
08/08/21 14:28:43 61SNR030_060_0064
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10-2Cooling System
Component Location Index
THERMOSTAT
RADIATOR
ENGINE COOLANT TEMPERATURE
(ECT) SENSOR 2
WATER PUMP
A/C CONDENSER FAN ASSEMBLY RADIATOR FAN ASSEMBLY
WATER PASSAGE COOLANT SEPARATOR
EXHAUST GAS RECIRCULATION
(EGR) PASSAGE
Test, page 10-5
Replacement, page 10-10
Replacement,
page 10-19Inspection, page 10-6
Replacement, page 10-6
Replacement, page 10-19
Fan Motor Test, page 10-5 Replacement, page 10-19
Fan Motor Test, page 10-5
Replacement,
page 10-11 Replacement, page 10-13
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K20Z3 engine
10-3
THERMOSTAT
RADIATOR
ENGINE COOLANT TEMPERATURE
(ECT) SENSOR 2
WATER PUMP
A/C CONDENSER FAN ASSEMBLY RADIATOR FAN ASSEMBLY WATER OUTLET
COOLANT SEPARATOR
OIL COOLER
WATER PASSAGE
Test, page 10-5
Replacement, page 10-10
Replacement, page 10-19
Inspection, page 10-6
Replacement, page 10-6
Replacement, page 10-19
Fan Motor Test, page 10-5 Replacement, page 10-19
Fan Motor Test, page 10-5 Replacement, page 10-16
Replacement, page 10-11
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K20Z2 engine
Engine Coolant Capacities (Including the coolant
reservoir capacity of 0.4 L (0.11 US gal))
M/T model:
After Coolant Change: 4.3 L (1.14 US gal)
After Engine Overhaul: 6.6 L (1.74 US gal)
A/T model:
After Coolant Change: 4.2 L (1.11 US gal)
After Engine Overhaul: 6.5 L (1.72 US gal)
K20Z3 engine
Engine Coolant Capacities (Including the coolant
reservoir capacity of 0.4 L (0.11 US gal))
After Coolant Change: 4.5 L (1.19 US gal)
After Engine Overhaul: 6.8 L (1.80 US gal)
10-8
Cooling System
Coolant Replacement
A
A
1. Wait until the engine is cool, then carefully removethe radiator cap.
2. Start the engine. Set the heater temperature control dial to maximum heat, then turn the ignition switch
to LOCK (0). Make sure the engine and the radiator
are cool to the touch.
3. Loosen the drain plug (A), and drain the coolant.
4. After the coolant has drained, tighten the radiator drain plug securely.
5. Remove, drain, and reinstall the coolant reservoir.
6. Fill the coolant reservoir to the MAX mark (A) with Honda Long Life Antifreeze/Coolant Type 2 (P/N
CA66688). 7. Pour Honda Long Life Antifreeze/Coolant Type 2
into the radiator up to the base of the filler neck.
NOTE: Always use Honda Long Life Antifreeze/Coolant Type 2. Using a non-Acura coolant can result in
corrosion, causing the cooling system to
malfunction or fail.
 Honda Long Life Antifreeze/Coolant Type 2 is a mixture of 50 % antifreeze and 50 % water. Do
not add water.
08/08/21 14:39:59 61SNR030_100_0008
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