Acura CSX. Instruction — page 39

02

03

Specified Air Pressure:
290 kPa (3.0 kgf/cm , 42 psi)

2

6-10

Cylinder Head

D
07ZAJ-PNAA300

B
07ZAJ-PNAA200

C
07ZAJ-PNAA101

A

E
07AAJ-PNAA101

C

A

B

8. Remove the sealing bolt (A) from the relief hole,

and install the VTEC air stopper (B).

9. Remove the No. 3 camshaft holder bolts, and install

the VTEC air adapters (C) finger-tight.

10. Connect the air joint adapter (D) and the air

pressure regulator (E).

11. Loosen the valve on the air pressure regulator, and

apply the specified air pressure.

NOTE: If the rocker arm piston does not move after
applying air pressure, move the rocker arm up and
down manually by rotating the crankshaft
clockwise.

12. With the specified air pressure applied, move the

secondary rocker arm (A) for the No. 1 cylinder.
The mid rocker arm (B), primary rocker arm (C),
and secondary rocker arm should move together.

• If the mid, primary, and secondary rocker arms

move together, go to step 13.

• If the mid and primary rocker arms do not move

together with the secondary rocker arm, remove
the mid, primary, and secondary rocker arms as
an assembly, and check that the pistons in the
rocker arms move smoothly. If any rocker arm
needs replacing, replace the mid, primary, and
secondary rocker arms as an assembly, then
retest.

13. Repeat step 12 on the remaining secondary rocker

arms with each piston at TDC. When all the
secondary rocker arms pass the test, go to step 14.

14. Remove the air pressure regulator, air joint adapter,

and the VTEC air stopper and VTEC air adapters.

15. Tighten the camshaft holder mounting bolts to

22 N·m (2.2 kgf·m, 16 lbf·ft).

16. Tighten the sealing bolt to 20 N·m (2.0 kgf·m,

14 lbf·ft).

17. Install the cylinder head cover (see page 6-37).

01

02

03

SNR9A00A14680463351MAAT00

6-11

VTC Actuator Inspection

A

B

1. Remove the cam chain (see page 6-18).

2. Loosen the rocker arm adjusting screws:

• K20Z2 engine (see step 2 on page 6-43)
• K20Z3 engine (see step 2 on page 6-44)

3. Remove the camshaft holder:

• K20Z2 engine (see step 3 on page 6-43)
• K20Z3 engine (see step 3 on page 6-44)

4. Remove the intake camshaft.

5. Check that the variable valve timing control (VTC)

actuator is locked by turning the VTC actuator
counterclockwise. If not locked, turn the VTC
actuator clockwise until it stops, then recheck it. If it
is still not locked, replace the VTC actuator.

6. Seal the advance holes (A) and the retard holes (B)

in the No. 1 camshaft journal with tape.

7. Punch a hole in the tape over one of the advance

holes.

8. Apply air to the advance hole to release the lock.

9. Check that the VTC actuator moves smoothly. If the

VTC actuator does not move smoothly, replace the
VTC actuator.

10. Remove the tape and adhesive residue from the

No. 1 camshaft journal.

11. Make sure the punch marks on the VTC actuator

and the exhaust camshaft sprocket are facing up,
then set the camshafts in the rocker shaft holder:

• K20Z2 engine (see step 6 on page 6-61)
• K20Z3 engine (see step 6 on page 6-62)

12. Set the camshaft holders and cam chain guide B in

place:

• K20Z2 engine (see step 7 on page 6-61)
• K20Z3 engine (see step 7 on page 6-62)

13. Tighten the camshaft holder bolts to the specified

torque:

• K20Z2 engine (see step 8 on page 6-61)
• K20Z3 engine (see step 8 on page 6-62)

14. Hold the camshaft, and turn the VTC actuator

clockwise until you hear it click. Make sure to lock
the VTC actuator by turning it.

15. Install the cam chain (see page 6-21).

16. Adjust the valve clearance:

• K20Z2 engine (see page 6-12)
• K20Z3 engine (see page 6-14)

01

02

03

SNR9AEAA14680200000MBAT00

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

6-12

Cylinder Head

Valve Clearance Adjustment

A

B

C

No. 1

No. 2

No. 3

No. 4

No. 1

No. 2

No. 3

No. 4

EXHAUST

INTAKE

A

B

• 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.

04

05

06

Specified Torque
Intake:
7 x 0.75 mm
20 N·m (2.0 kgf·m, 14 lbf·ft)
Apply new engine oil to the nut threads.
Exhaust:
7 x 0.75 mm
14 N·m (1.4 kgf·m, 10 lbf·ft)
Apply new engine oil to the nut threads.

6-13

07MAA-PR70110

07MAA-PR70120

5. If you feel too much or too little drag, loosen the

locknut with the locknut wrench and the adjuster,
and turn the adjusting screw until the drag on the
feeler gauge is correct.

6. Tighten the locknut to the specified torque, and

recheck the clearance. Repeat the adjustment if
necessary.

7. Rotate the crankshaft 180 ° clockwise (camshaft

pulley turns 90 °).

8. Check and, if necessary, adjust the valve clearance

on the No. 3 cylinder.

9. Rotate the crankshaft 180 ° clockwise (camshaft

pulley turns 90 °).

10. Check and, if necessary, adjust the valve clearance

on the No. 4 cylinder.

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