Acura CSX. Instruction — page 50

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K20Z3 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.)

6-52

Cylinder Head

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.

03

04

05

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

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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.

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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.)

6-55

6-55

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.

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