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Acura RSX Honda Integra. Manual - part 50

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−

K20A3 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:

5.42 mm (0.213 in.)

K20A2, K20Z1 Engines
Intake Valve Dimensions:
A Standard (New): 34.85

35.15 mm

(1.372

1.384 in.)

B Standard (New): 108.8

109.4 mm

(4.283

4.307 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:

5.42 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.)

6-44

Cylinder Head

Valve Inspection

Valve Stem-to-Guide Clearance
Inspection

1. Remove the valves (see page 6-43).

2. Measure the valve in these areas.

1. Remove the valves (see page 6-43).

2. Slide the valve out of its guide about 10 mm

(0.39 in.), then measure the guide-to-stem
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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Special Tools Required

6-45

Valve Guide Replacement

5.3 mm
(0.21 in.)

10.8 mm
(0.42 in.)

87 mm
(3.43 in.)

57 mm
(2.24 in.)

• Valve guide driver, 5.5 mm 07742-0010100
• Valve guide reamer, 5.5 mm 07HAH-PJ7A100

1. Inspect valve stem-to-guide clearance (see page

6-44).

2. As illustrated, use a commercially available air-

impact valve guide driver (A) modified to fit the
diameter of the valve guides. In most cases, the
same procedure can be done using the special tool
and a conventional hammer.

3. Select the proper replacement guides, and chill

them in the freezer section of a refrigerator for
about an hour.

4. Use a hot plate or oven to evenly heat the cylinder

head to 300 °F (150 °C). Monitor the temperature
with a cooking thermometer. Do not get the head
hotter than 300 °F (150 °C); excessive heat may
loosen the valve seats.

5. Working from the camshaft side, use the driver and

an air hammer to drive the guide about 2 mm (0.1
in.) towards the combustion chamber. This will
knock off some of the carbon and make removal
easier. Hold the air hammer directly in line with the
valve guide to prevent damaging the driver. Wear
safety goggles or a face shield.

6. Turn the head over, and drive the guide out toward

the camshaft side of the head.

7. If a valve guide won’t move, drill it out with a 8 mm

(5/16 inch) bit, then try again. Drill guides only in
extreme cases; you could damage the cylinder
head if the guide breaks.

8. Take out the new guide(s) from the freezer, one at a

time, as you need them.

(cont’d)

０４

０１

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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.)

6-46

Cylinder Head

Valve Guide Replacement (cont’d)

07742-0010100

07HAH-PJ7A100

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 special tool 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 reamer and valve guide with cutting oil.

11. Rotate the reamer clockwise 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 6-44).

Verify that a valve slides in the intake and exhaust
valve guides without exerting pressure.

15. Inspect the valve seating, if necessary renew the

valve seat using a valve seat cutter (see page 6-47).

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K20A3 engine:

K20A2, K20Z1 engines:

Valve Seat Width
Standard (New): 1.25

1.55 mm (0.049

0.061 in.)

Service Limit:

2.00 mm (0.079 in.)

6-47

Valve Seat Reconditioning

INTAKE: 35 °
EXHAUST: 30 °

45 °

67.5 °

86 ° (Exhaust)

80 ° (Exhaust)

INTAKE: 35 °
EXHAUST: 30 °

45 °

67.5 °

86 ° (Exhaust)

80 °

1. Inspect valve stem-to-guide clearance (see page

6-44). If the valve guides are worn, replace them
(see page 6-45) 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.

(cont’d)

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