service ACURA CSX 2006 Service Service Manual



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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.
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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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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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Valve Seat Width
Standard (New): 1.25 1.55 mm (0.049 0.061 in.)
Service Limit: 2.00 mm (0.079 in.)
6-58 Cylinder Head
Valve Seat Reconditioning
45 °
INTAKE: 35 °
EXHAUST: 30 °
67.5 ° A
B
1. Inspect the valve stem-to-guide clearance
(see page 6-55). If the valve guides are worn,
replace them (see page 6-56) before cutting the
valve seats.
2. Renew the valve seats in the cylinder head using a valve seat cutter.
3. Carefully cut a 45 ° seat, removing only enough material to ensure a smooth and concentric seat.
4. Bevel the upper and lower edges at the angles
shown in the illustration.
Check the width of the seat and adjust accordingly. 5. Make one more very light pass with the 45 ° cutter
to remove any possible burrs caused by the other
cutters.
6. After resurfacing the seat, inspect for even valve seating. Apply Prussian Blue compound (A) to the
valve face. Insert the valve in its original location in
the head, then lift it and snap it closed against the
seat several times.
7. The actual valve seating surface (B), as shown by the blue compound, should be centered on the seat.
 If it is too high (closer to the valve stem), you must make a second cut with the 67.5 ° cutter to
move it down, then one more cut with the 45 °
cutter to restore seat width.
 If it is too low (close to the valve edge), you must make a second cut with the 35 ° cutter (intake
side) or the 30 ° cutter (exhaust side) to move it
up, then make one more cut with the 45 ° cutter
to restore seat width.
NOTE: The final cut should always be made with
the 45 ° cutter.
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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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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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Connecting Rod End Play
Standard (New): 0.15 0.30 mm (0.006 0.012 in.)
Service Limit: 0.40 mm (0.016 in.) Crankshaft End Play
Standard (New): 0.10 0.35 mm (0.004 0.014 in.)
Service Limit: 0.45 mm (0.018 in.)
7-5
Connecting Rod and Crankshaft End Play Inspection
1. Remove the oil pump (see page 8-16).
2. Remove the baffle plates (see step 8 on page 7-13).
3. Measure the connecting rod end play with a feeler
gauge between the connecting rod and the
crankshaft.
4. If the connecting rod end play is beyond the service limit, install a new connecting rod, and recheck. If it
is still beyond the service limit; replace the
crankshaft (see page 7-13). 5. Push the crankshaft firmly away from the dial
indicator, and zero the dial against the end of the
crankshaft. Then pull the crankshaft firmly back
toward the indicator, the dial reading should not
exceed the service limit.
6. If the end play is beyond the service limit, replace the thrust washers and recheck. If it is still beyond
the service limit, replace the crankshaft (see page
7-13).
08/08/21 14:32:32 61SNR030_070_0005
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Main Bearing Clearance Inspection
Main Bearing-to-Journal Oil Clearance
No.1,2,4,5Journals:
Standard (New): 0.017 0.041 mm (0.0007 0.0016 in.)
Service Limit: 0.050 mm (0.0020 in.)
No. 3 Journal:
Standard (New): 0.025 0.049 mm (0.0010 0.0019 in.)
Service Limit: 0.055 mm (0.0022 in.)
7-6 Engine Block
Crankshaft Main Bearing Replacement
1. To check the main bearing-to-journal oil clearance,
remove the lower block and the bearing halves
(see page 7-13).
2. Clean each main journal and bearing half with a clean shop towel.
3. Place one strip of plastigage across each main journal.
4. Reinstall the bearings and lower block, then tighten the bolts to 29 N·m (3.0 kgf·m, 22 lbf·ft) 56 ° in
thepropersequence(seestep19onpage7-27).
NOTE: Apply new engine oil to the bolt threads and flanges.
 Do not rotate the crankshaft during inspection.
5. Remove the lower block and the bearings again, and measure the widest part of the plastigage. 6. If the plastigage measures too wide or too narrow,
remove the crankshaft, and remove the upper half
of the bearing. Install a new, complete bearing with
the appropriate color code(s), and recheck the
clearance. Do not file, shim, or scrape the bearings
or the caps to adjust clearance.
7. If the plastigage shows the clearance is still incorrect, try the next larger or smaller bearing (the
color listed above or below the current one), and
check again. If the proper clearance cannot be
obtained by using the appropriate larger or smaller
bearings, replace the crankshaft, and start over.
08/08/21 14:32:32 61SNR030_070_0006
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Connecting Rod Bearing Clearance
Inspection
Connecting Rod Bearing-to-Journal Oil Clearance
K20Z2 engine
Standard (New): 0.020 0.050 mm (0.0008 0.0020 in.)
Service Limit: 0.060 mm (0.0024 in.)
K20Z3 engine
Standard (New): 0.032 0.066 mm (0.0013 0.0026 in.)
Service Limit: 0.077 mm (0.0030 in.)
7-87-8 Engine Block
Crankshaft Main Bearing
Replacement (cont’d)
Connecting Rod Bearing
Replacement
Larger crank bore
1or
AorI 2or
BorII 3or
C or III4or
D or IIII
Smaller bearing (Thicker)
Blue
Pink
Yellow Green
Green/
Brown
Brown Green
Green/
Brown
Brown Green
Green/
Brown
Brown Green
Green/
Brown
Brown
Black Black/
Blue
Crank
bore
code
Pink/
YellowYellow
Yellow
Pink/
Yellow
Black
Black Black/
Blue
Main
journal
code
1
2
3
4
5
6
Smaller
main
journal Smaller
bearing
(Thicker)
3. Use the crank bore codes and crank journal codes
to select the appropriate replacement bearings
from the following table.
NOTE: Color code is on the edge of the bearing.
 When using bearing halves of different colors, it does not matter which color is used in the top or
bottom. 1. Remove the oil pump (see page 8-16).
2. Remove the baffle plates (see step 8 on page 7-13).
3. Remove the connecting rod cap and the bearing
half.
4. Clean the crankshaft rod journal and the bearing half with a clean shop towel.
5. Place plastigage across the rod journal.
6. Reinstall the bearing half and connecting rod cap, and tighten the bolts to 20 N·m (2.0 kgf·m, 14 lbf·ft)90 ° (K20Z2 engine) or 29 N·m (3.0 kgf·m,
22 lbf·ft) 90 ° (K20Z3 engine).
NOTE:  Apply new engine oil to the bolt threads and flanges.
 Do not rotate the crankshaft during inspection.
7. Remove the connecting rod cap and the bearing half, and measure the widest part of the plastigage.
08/08/21 14:32:33 61SNR030_070_0008
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Out-of-Round and Taper
Journal Out-of-Round
Standard (New): 0.005 mm (0.0002 in.) max.
Service Limit: 0.010 mm (0.0004 in.)
Journal Taper
Standard (New): 0.005 mm (0.0002 in.) max.
Service Limit: 0.010 mm (0.0004 in.) Straightness
Crankshaft Total Runout
Standard (New): 0.03 mm (0.0012 in.) max.
Service Limit: 0.04 mm (0.0016 in.)
7-15
Crankshaft Inspection
1. Remove the crankshaft from the engine block(see page 7-13).
2. Clean the crankshaft oil passages with pipe cleaners or suitable brush.
3. Clean the keyway and the threads, and check for damage.
4. Measure the out-of-round at the middle of each rod and main journal in two places. The difference
between measurements on each journal must not
be more than the service limit.
5. Measure the taper at the edges of each rod and the main journal. The difference between
measurement on each journal must not be more
than the service limit. 6. Place the V-blocks on a flat surface.
7. Check the total runout with the crankshaft
supported on V-blo cks.
8. Measure the runout on all main journals. Rotate the crankshaft two complete revolutions. The
difference between measurements on each journal
must not be more than the service limit.
08/08/21 14:32:37 61SNR030_070_0015
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