2006 ACURA CSX engine




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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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DYNOMITE -2009-

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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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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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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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DYNOMITE -2009-


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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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DYNOMITE -2009-


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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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DYNOMITE -2009-

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Intake Valve Stem Installed Height
Standard (New): 44.0 44.5 mm (1.73 1.75 in.)
Service Limit: 44.7 mm (1.76 in.)
Exhaust Valve Stem Installed Height
Standard (New): 44.1 44.6 mm (1.74 1.76 in.)
Service Limit: 44.8 mm (1.76 in.) Special Tools Required
6-596-59
Valve, Spring, and Valve Seal
Installation
A
AB
07PAD-0010000
F
D
EC
8. Insert the intake and exhaust valves in the head, and measure the valve stem installed height (A).
9. If the valve stem installed height is beyond the service limit, replace the valve and recheck. If it is
still beyond the service limit, replace the cylinder
head, the valve seat in the head is too deep.  Stem seal driver 07PAD-0010000
 Valve spring compressor attachment 07757-PJ1010A
1. Coat the valve stems with new engine oil. Install the valves in the valve guides.
2. Check that the valves move up and down smoothly.
3. Install the spring seats on the cylinder head.
4. Install the new valve seals (A) using the 5.5 mm side of the stem seal driver (B).
NOTE: The exhaust valve seal (C) has a black spring
(D), and the intake valve seal (E) has a white spring
(F). They are not interchangeable.
(cont’d)
08/08/21 14:28:23 61SNR030_060_0059
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DYNOMITE -2009-

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Intake Valve Stem Installed Height
Standard (New): 44.0 44.5 mm (1.73 1.75 in.)
Service Limit: 44.7 mm (1.76 in.)
Exhaust Valve Stem Installed Height
Standard (New): 44.1 44.6 mm (1.74 1.76 in.)
Service Limit: 44.8 mm (1.76 in.) Special Tools Required
6-596-59
Valve, Spring, and Valve Seal
Installation
A
AB
07PAD-0010000
F
D
EC
8. Insert the intake and exhaust valves in the head, and measure the valve stem installed height (A).
9. If the valve stem installed height is beyond the service limit, replace the valve and recheck. If it is
still beyond the service limit, replace the cylinder
head, the valve seat in the head is too deep.  Stem seal driver 07PAD-0010000
 Valve spring compressor attachment 07757-PJ1010A
1. Coat the valve stems with new engine oil. Install the valves in the valve guides.
2. Check that the valves move up and down smoothly.
3. Install the spring seats on the cylinder head.
4. Install the new valve seals (A) using the 5.5 mm side of the stem seal driver (B).
NOTE: The exhaust valve seal (C) has a black spring
(D), and the intake valve seal (E) has a white spring
(F). They are not interchangeable.
(cont’d)
08/08/21 14:28:23 61SNR030_060_0059
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DYNOMITE -2009-