Acura CSX. Instruction — page 51






Special Tools Required


Cylinder Head

Valve Guide Replacement


5.3 mm
(0.21 in.)

10.8 mm
(0.43 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 the valve stem-to-guide clearance

(see page 6-55).

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 valve guide
driver and a conventional hammer.

3. Select the proper replacement guides, and chill

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

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

head to 150 °C (300 °F). Monitor the temperature
with a cooking thermometer. Do not get the head
hotter than 150 °C (300 °F); 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.

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 in.) bit, then try again.

NOTE: Drill guides only in extreme cases, you
could damage the cylinder head if the guide breaks.

8. Remove out the new guide(s) from the freezer, one

at a time, as you need them.



Valve Guide Installed Height


16.2 mm (0.598

0.638 in.)



16.5 mm (0.610

0.650 in.)






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).





Valve Seat Width
Standard (New): 1.25

1.55 mm (0.049

0.061 in.)

Service Limit:

2.00 mm (0.079 in.)


Cylinder Head

Valve Seat Reconditioning

45 °

INTAKE: 35 °

67.5 °



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

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.




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



Valve, Spring, and Valve Seal








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.

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