Valve Guide Replacement - Honda Accord 2008 Manual

07/11/02 09:25:47 61TA0000_060_0092
Cylinder Head

Valve Guide Replacement

Special Tools Required
• 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 6-91).
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.
＊０１
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.
＊０２
6-92
A
5.3 mm
(0.21 in.)
87 mm 57 mm
(3.43 in.) (2.24 in.)
10.8 mm
(0.42 in.)
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. 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.
ＴＡ０８ＡＥＪＡ１４６８０２６３００１ＫＢＡＴ００
＊０３
＊０４