2006 ACURA CSX oil



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Removal Installation
Specified Torque
VTC Actuator Mounting Bolt:
12x1.25mm
113 N·m (11.5 kgf·m, 83 lbf·ft)
Exhaust Camshaft Sprocket Mounting Bolt:
10x1.25mm
72 N·m (7.3 kgf·m, 53 lbf·ft)
6-42Cylinder Head
VTC Actuator, Exhaust Camshaft Sprocket Replacement
1. Remove the cam chain (see page 6-18).
2. Hold the exhaust camshaft with an open-end
wrench, then loosen the variable valve timing
control (VTC) actuator mounting bolt and the
exhaust camshaft sprocket mounting bolt.
3. If the VTC actuator is reused, do these steps. –1 Remove the intake camshaft, and seal theadvance holes and retard holes in the No. 1
camshaft journal with tape (see step 6 on page
6-11).
–2 Punch a hole in the tape over one of the advance holes (see step 7 on page 6-11).
–3 Apply air to the advance hole to release the lock (see step 8 on page 6-11).
–4 Remove the tape from the No. 1 camshaft journal.
4. Remove the VTC actuator and the exhaust camshaft sprocket. 1. Install the variable valve timing control (VTC)
actuator and exhaust camshaft sprocket.
NOTE: Install the VTC actuator to unlock position.
2. Apply new engine oil to the threads of the VTC actuator mounting bolt and the exhaust camshaft
mounting bolt, then install them.
3. Hold the exhaust camshaft with an open-end wrench, then tighten the mounting bolts.
4. Hold the exhaust camshaft with an open-end wrench, and turn the VTC actuator clockwise until
you hear it click. Make sure to lock the VTC actuator
by turning it.
5. Install the cam chain (see page 6-21).
08/08/21 14:28:11 61SNR030_060_0042
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K20Z2 engine
6-46Cylinder Head
Rocker Arm and Shaft Disassembly/Reassembly
EXHAUST ROCKER
SHAFT
EXHAUST ROCKER ARM
No. 1
ROCKER SHAFT
HOLDER RUBBER BAND
No. 2
ROCKER SHAFT
HOLDER No. 3
ROCKER SHAFT
HOLDER No. 4
ROCKER SHAFT
HOLDER
INTAKE ROCKER
ARM ASSEMBLYNo. 5
ROCKER SHAFT
HOLDER
INTAKE ROCKER SHAFT
NOTE:  Identify each part as it is removed so that each item can be reinstalled in its original position.
 Inspect the rocker shafts and the rocker arms (see page 6-48).
 If reused, the rocker arms must be installed in the same positions.
 When removing, or installing the rocker arm assembly, do not remove the camshaft holder bolts. The bolts will keep the holders and rocker arms on the shaft.
 Prior to reassembling, clean all the parts in solvent, dry them, and apply new engine oil to any contact points.
 Bundle the intake rocker arms with rubber bands to keep them together as a set.
 When replacing the intake rocker arm assembly, remove the fastening hardware from the new intake rocker arm assembly.
08/08/21 14:28:15 61SNR030_060_0046
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K20Z3 engine
6-47
EXHAUST ROCKER
SHAFT
EXHAUST ROCKER
ARM ASSEMBLY
No. 1
ROCKER SHAFT
HOLDER RUBBER BAND No. 2
ROCKER SHAFT
HOLDERNo. 3
ROCKER SHAFT
HOLDER No. 4
ROCKER SHAFT
HOLDER
INTAKE ROCKER
ARM ASSEMBLYNo. 5
ROCKER SHAFT
HOLDER
INTAKE ROCKER SHAFT
RUBBER BAND
NOTE:
 Identify each part as it is removed so that each item can be reinstalled in its original position.
 Inspect the rocker shafts and the rocker arms (see page 6-49).
 If reused, the rocker arms must be installed in the same positions.
 When removing, or installing the rocker arm assembly, do not remove the camshaft holder bolts. The bolts will keep the holders and rocker arms on the shaft.
 Prior to reassembling, clean all the parts in solvent, dry them, and apply new engine oil to any contact points.
 Bundle the rocker arms with rubber bands to keep them together as a set.
 When replacing the VTEC rocker arm assembly, remove the fastening hardware from the new VTEC rocker arm assembly.
08/08/21 14:28:16 61SNR030_060_0047
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K20Z2 engine
Rocker Arm-to-Shaft Clearance
Standard (New):
Intake: 0.025 0.052 mm (0.0010 0.0020 in.)
Exhaust: 0.018 0.056 mm (0.0007 0.0022 in.)
Service Limit: 0.08 mm (0.003 in.)
6-48 Cylinder Head
Rocker Arm and Shaft Inspection
A
A
1. Remove the rocker arm assembly (see page 6-43).
2. Disassemble the rocker arm assembly (see page6-46).
3. Measure the diameter of the shaft at the first rocker location.
4. Zero the gauge (A) to the shaft diameter. 5. Measure the inside diameter of the rocker arm, and
check it for an out-of-round condition.
6. Repeat for all rocker arms and both shafts. If the clearance is beyond the service limit, replace the
rocker shaft and all out of service limit rocker arms.
If any VTEC rocker arm needs replacement, replace
the rocker arms (primary and secondary), as a set.
7. Inspect the rocker arm pistons (A). Push on each piston manually. If it does not move smoothly,
replace the rocker arm as a set.
NOTE: Apply new engine oil to the rocker arm
pistons when reassembling.
8. Install the rocker arm assembly (see page 6-60).
08/08/21 14:28:16 61SNR030_060_0048
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K20Z3 engine
Rocker Arm-to-Shaft Clearance
Standard (New): 0.025 0.052 mm (0.0010 0.0020 in.)
Service Limit: 0.08 mm (0.003 in.)
6-49
A
A
1. Remove the rocker arm assembly (see page 6-44).
2. Disassemble the rocker arm assembly (see page6-47).
3. Measure the diameter of the shaft at the first rocker location.
4. Zero the gauge (A) to the shaft diameter. 5. Measure the inside diameter of the rocker arm, and
check it for an out-of-round condition.
6. Repeat for all rocker arms and both shafts. If the clearance is beyond the service limit, replace the
rocker shaft and all out of service limit rocker arms.
If any VTEC rocker arm needs replacement, replace
the rocker arms (primary, mid, and secondary), as a
set.
7. Inspect the rocker arm pistons (A). Push on each piston manually. If it does not move smoothly,
replace the rocker arms as a set.
NOTE: Apply new engine oil to the rocker arm
pistons when reassembling.
8. Install the rocker arm assembly (see page 6-61).
08/08/21 14:28:17 61SNR030_060_0049
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Camshaft-to-Holder Oil Clearance
Standard (New):
No. 1 Journal: 0.030 0.069 mm
(0.001 0.003 in.)
No. 2, 3, 4, 5 Journals: 0.060 0.099 mm (0.002 0.004 in.)
Service Limit: 0.15 mm (0.006 in.) Camshaft Total Runout
Standard (New): 0.03 mm (0.001 in.) max.
Service Limit: 0.04 mm (0.002 in.)
Cam Lobe Height Standard (New):
6-51
INTAKE
SEC PRI
C/C
5. Loosen the camshaft holder bolts two turns at a time, in a crisscross pattern. Then remove the
camshaft holders from the cylinder head.
6. Lift the camshafts out of the cylinder head, wipe them clean, then inspect the lift ramps. Replace the
camshaft if any lobes are pitted, scored, or
excessively worn.
7. Clean the camshaft journal surfaces in the cylinder head, then set the camshafts back in place. Place a
plastigage strip across each journal.
8. Install the camshaft holders, then tighten the bolts to the specified torque as shown in step 2.
9. Remove the camshaft holders. Measure the widest portion of plastigage on each journal.
 If the camshaft-to-holder clearance is within the service limits, go to step 11.
 If the camshaft-to-holder clearance is beyond the service limit, and the camshaft has been replaced,
replace the cylinder head.
 If the camshaft-to-holder clearance is beyond the service limit, and the camshaft has not been
replaced, go to step 10. 10. Check the total runout with the camshaft supported
on V-blocks.
 If the total runout of the camshaft is within the service limit, replace the cylinder head.
 If the total runout is beyond the service limit, replace the camshaft, and recheck the camshaft-
to-holder oil clearance. If the oil clearance is still
beyond the service limit, replace the cylinder
head.
11. Measure the cam lobe height. INTAKE EXHAUST
PRI 34.263 mm (1.3489 in.) 34.092 mm
(1.3422 in.)
SEC 29.638 mm (1.1668 in.)
PRI: Primary SEC: Secondary C/C: Cam Chain
08/08/21 14:28:18 61SNR030_060_0051
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Camshaft-to-Holder Oil Clearance
Standard (New):
No. 1 Journal: 0.030 0.069 mm
(0.001 0.003 in.)
No. 2, 3, 4, 5 Journals: 0.060 0.099 mm (0.002 0.004 in.)
Service Limit: 0.15 mm (0.006 in.) Camshaft Total Runout
Standard (New): 0.03 mm (0.001 in.) max.
Service Limit: 0.04 mm (0.002 in.)
Cam Lobe Height Standard (New):
6-53
INTAKE
EXHAUST
PRI MID SEC SEC
MID PRI
C/C C/C
5. Loosen the camshaft holder bolts two turns at a
time, in a crisscross pattern. Then remove the
camshaft holders from the cylinder head.
6. Lift the camshafts out of the cylinder head, wipe them clean, then inspect the lift ramps. Replace the
camshaft if any lobes are pitted, scored, or
excessively worn.
7. Clean the camshaft journal surfaces in the cylinder head, then set the camshafts back in place. Place a
plastigage strip across each journal.
8. Install the camshaft holders, then tighten the bolts to the specified torque as shown in step 2.
9. Remove the camshaft holders. Measure the widest portion of plastigage on each journal.
 If the camshaft-to-holder clearance is within the service limits, go to step 11.
 If the camshaft-to-holder clearance is beyond the service limit and the camshaft has been replaced,
replace the cylinder head.
 If the camshaft-to-holder clearance is beyond the service limit and the camshaft has not been
replaced, go to step 10. 10. Check the total runout with the camshaft supported
on V-blocks.
 If the total runout of the camshaft is within the service limit, replace the cylinder head.
 If the total runout is beyond the service limit, replace the camshaft and recheck the camshaft-
to-holder oil clearance. If the oil clearance is still
beyond the service limit, replace the cylinder
head.
11. Measure the cam lobe height. INTAKE EXHAUST
PRI 32.791 mm (1.2910 in.) 32.772 mm
(1.2902 in.)
MID 35.534 mm (1.3990 in.) 34.768 mm
(1.3688 in.)
SEC 32.678 mm (1.2865 in.) 32.661 mm
(1.2859 in.)
PRI: Primary MID: Mid SEC: Secondary
C/C: Cam Chain
08/08/21 14:28:19 61SNR030_060_0053
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Valve Guide Installed Height
Intake: 15.2 16.2 mm (0.598 0.638 in.)
Exhaust: 15.5 16.5 mm (0.610 0.650 in.)
6-57
B
A
07742-0010100
07HAH-PJ70100
9. Apply a thin coat of new engine oil to the outside of
the new valve guide. Install the guide from the
camshaft side of the head, use the valve guide
driver to drive the guide in to the specified installed
height (A) of the guide (B). If you have all 16 guides
to do, you may have to reheat the head. 10. Coat both valve guide reamer, 5.5 mm and the
valve guide with cutting oil.
11. Rotate the reamer clockwise to the full length of the valve guide bore.
12. Continue to rotate the reamer clockwise while removing it from the bore.
13. Thoroughly wash the guide in detergent and water to remove any cutting residue.
14. Check the clearances with a valve (see page 6-55). Verify that a valve slides into the intake and
exhaust valve guides without sticking.
15. Inspect the valve seating, if necessary renew the valve seat using a valve seat cutter (see page 6-58).
08/08/21 14:28:22 61SNR030_060_0057
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