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Acura CSX. Manual - part 49

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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

1. Remove the rocker arm assembly (see page 6-43).

2. Disassemble the rocker arm assembly (see page

6-46).

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).

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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

1. Remove the rocker arm assembly (see page 6-44).

2. Disassemble the rocker arm assembly (see page

6-47).

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

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).

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K20Z2 engine

Specified Torque
8 x 1.25 mm
22 N·m (2.2 kgf·m, 16 lbf·ft)
6 x 1.0 mm
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.

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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

Content .. 47 48 49 50 ..