Valve Guide Replacement
Special Tools Required. Valve guide driver, 5.5 mm 07742-0010100. Valve guide reamer, 5.5 mm 07HAH-PJ7o108
1.Inspect valve stem-to-guide clearance (see page 6-
32t.
As illustrated below, 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.
10.8 mm{0.,|2 in.)
3. Select the proper replacement guides, and chill
lhem in the freezer section of a refriqerator 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 getthe head
hotterthan 300'F (150"C); excessive heat may
loosen the valve seats.
-_|Jfillr-.-4fi'11., -
tT
7.
Working from the camshaft side. use the driver and
an aar hammerto 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.
Turn lhe head over, and drive the guide out toward
the camshaft side of the head.
lf a valve guide won't move, drill it out with a I mm
(5/16 inch) bit. then try again. Drill guides only in
extreme cases;you could damage the cylinder
head if the guide breaks.
Remove the new guide(s) from the freezer, one at a
time, as vou need them.
(cont'd)
6-33
