ACURA CSX 2006 Service Repair Manual


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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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K20Z2 engine
Specified Torque
8x1.25mm
22 N·m (2.2 kgf·m, 16 lbf·ft)
6x1.0mm
12 N·m (1.2 kgf·m, 8.7 lbf·ft)
6 x 1.0 mm Bolts: , , Camshaft End Play
Standard (New): 0.05 0.20 mm
(0.002 0.008 in.)
Service Limit: 0.4 mm (0.02 in.)
6-50 Cylinder Head
Camshaft Inspection
NOTE: Do not rotate the camshaft during inspection.
1. Remove the rocker arm assembly (see page 6-43).
2. Put the rocker shaft holders, the camshaft, and the camshaft holders on the cylinder head, then tighten
the bolts, in sequence, to the specified torque. 3. Seat the camshaft by pushing it away from the
camshaft pulley end of the cylinder head.
4. Zero the dial indicator against the end of the camshaft, then push the camshaft back and forth,
and read the end play. If the end play is beyond the
service limit, replace the cylinder head and recheck.
If it is still beyond the service limit, replace the
camshaft.
08/08/21 14:28:18 61SNR030_060_0050
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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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K20Z3 engine
Specified Torque
8x1.25mm
22 N·m (2.2 kgf·m, 16 lbf·ft)
6x1.0mm
12 N·m (1.2 kgf·m, 8.7 lbf·ft)
6 x 1.0 mm Bolts: , , Camshaft End Play
Standard (New): 0.05 0.20 mm (0.002 0.008 in.)
Service Limit: 0.4 mm (0.02 in.)
6-52Cylinder Head
Camshaft Inspection (cont’d)
NOTE: Do not rotate the camshaft during inspection.
1. Remove the rocker arm assembly (see page 6-44).
2. Put the rocker shaft holders, camshaft, and camshaft holders on the cylinder head, then tighten
the bolts in sequence to the specified torque.
NOTE: If the engine does not have bolt , skip it
and continue the torque sequence. 3. Seat the camshaft by pushing it away from the
camshaft pulley end of the cylinder head.
4. Zero the dial indicator against the end of the camshaft, then push the camshaft back and forth
and read the end play. If the end play is beyond the
service limit, replace the cylinder head and recheck.
If it is still beyond the service limit, replace the
camshaft.
08/08/21 14:28:19 61SNR030_060_0052
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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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Special Tools Required
6-54
Cylinder Head
Valve, Spring, and Valve Seal Removal
B
A
07757-PJ1010A A
Valve spring compressor attachment 07757-PJ1010A
Identify the valves and the valve springs as they are
removed so that each item can be reinstalled in its
original position.
1. Remove the cylinder head (see page 6-38).
2. Remove the rocker arm assembly:
 K20Z2 engine (see page 6-43)
 K20Z3 engine (see page 6-44)
3. Using an appropriate-sized socket (A) and plastic mallet (B), lightly tap the spring retainer to loosen
the valve cotters.
4. Install the valve spring compressor attachment and the valve spring compressor. Compress the valve
spring, and remove the valve cotters.
5. Remove the valve spring compressor, the valve spring compressor attachment, the spring retainer,
the valve spring and the valve. 6. Install the valve guide seal remover (A).
7. Remove the valve seal.
8. Remove the valve spring seat.
08/08/21 14:28:20 61SNR030_060_0054
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K20Z2 engine
Intake Valve Dimensions
A Standard (New): 34.85 35.15 mm
(1.372 1.384 in.)
B Standard (New): 108.7 109.5 mm (4.280 4.311 in.)
C Standard (New): 5.475 5.485 mm (0.2156 0.2159 in.)
C Service Limit: 5.445 mm (0.214 in.)
Exhaust Valve Dimensions
A Standard (New): 29.85 30.15 mm (1.175 1.187 in.)
B Standard (New): 108.3 109.1 mm (4.264 4.295 in.)
C Standard (New): 5.450 5.460 mm (0.2146 0.2150 in.)
C Service Limit: 5.420 mm (0.213 in.)
K20Z3 engine
Intake Valve Dimensions
A Standard (New): 34.85 35.15 mm (1.372 1.384 in.)
B Standard (New): 108.5 109.1 mm (4.272 4.295 in.)
C Standard (New): 5.475 5.485 mm (0.2156 0.2159 in.)
C Service Limit: 5.445 mm (0.214 in.)
Exhaust Valve Dimensions
A Standard (New): 29.85 30.15 mm (1.175 1.187 in.)
B Standard (New): 108.4 109.0 mm (4.268 4.291 in.)
C Standard (New): 5.450 5.460 mm (0.2146 0.2150 in.)
C Service Limit: 5.420 mm (0.213 in.) Intake Valve Stem-to-Guide Clearance
Standard (New): 0.06 0.11 mm
(0.002 0.004 in.)
Service Limit: 0.16 mm (0.006 in.)
Exhaust Valve Stem-to-Guide Clearance
Standard (New): 0.11 0.16 mm (0.004 0.006 in.)
Service Limit: 0.22 mm (0.009 in.)
Intake Valve Stem-to-Guide Clearance
Standard (New): 0.030 0.055 mm (0.0012 0.0022 in.)
Service Limit: 0.08 mm (0.003 in.)
Exhaust Valve Stem-to-Guide Clearance
Standard (New): 0.055 0.080 mm (0.0022 0.0031 in.)
Service Limit: 0.11 mm (0.004 in.)
6-556-55
Valve Inspection Valve Stem-to-Guide Clearance
Inspection
C
B
A
1. Remove the valves (see page 6-54).
2. Measure the valve in these areas. 1. Remove the valves (see page 6-54). 2. Slide the valve out of its guide about 10 mm(0.39 in.), then measure the stem-to-guide
clearance with a dial indicator while rocking the
stem in the direction of normal thrust (wobble
method). If the measurement exceeds the service limit, recheck it using a new valve.
 If the measurement is now within the service limit, reassemble using a new valve.
 If the measurement with a new valve still exceeds the service limit, go to step 3.
3. Subtract the O.D. of the valve stem, measured with a micrometer, from the I.D. of the valve guide,
measured with an inside micrometer or ball gauge.
Take the measurements in three places along the
valve stem and three places inside the valve guide.
The difference between the largest guide
measurement and the smallest stem measurement
should not exceed the service limit.
08/08/21 14:28:20 61SNR030_060_0055
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