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\,
Replacement
1. As illustrated below use a commercially available
air-impact valve guide driver attachment modified
t o f i t t h e d i a m e t e r o f t h e v a l v e g u i d e s , I n m o s t
cases, the same procedure can be done using the
special tool and a conventional hammer.
6.il mm
{ 0 . 2 5 i n l
rr
*f-::rt
l1-r
87 mm
{3.43 in)
1 1 . 3 m m
10.44 inl
or
VALVE GUIDE DBIVER, 6.6 mm
07942 - 6570100
S e l e c t t h e p r o p e r r e p l a c e m e n t g u i d e s a n d c h i l l
t h e m i n t h e f r e e z e r s e c t i o n o f a r e f r i g e r a t o r f o r
about an hour.
Use a hot plate or oven to evenly heat the cylinder
head to 300"F (150"C). Monitor the temperature with
a cooking thermometer.
CAUTION:
. Do not use a torch; it may warp the hoad.
. Do not ger tho head hotter than 300.F ltS0"C);
exces3ive heat may loo3en the valvo seats.
. To avoid burns, uss heaw gloves when handling
the heat€d cylinder head.
12.21inl
6-27
Working trom the camshaft side, use the driver and
8n air hammer to drive the guide about 2 mm (0.1
i n ) t o w a r d s t h e c o m b u s t i o n c h a m b e r . T h i s w i l l
knock off some of the carbon and make removal
easter.
CAUTION:
. Always wear safety goggles or a face shield
when driving valve guides.
. Hold the air hammer direcfly in line with the
valve guide to prevent damaging the driver.
Turn the head over and drive the guide out toward
the camshaft side of head.
5 .
VALVE GUIDE DRIVER.
079i12 - 6570100
6.6 mm
lf a valve guide still won't move. drill it out with a
8.0 mm (5/16 in) bit, then try again.
CAUTION: Drill guides only in extreme cases; You
could damage the cylinder head it the guide breaks.
6.
Remove the new guide{s) from the freezer, one at a
time, as you need them.
{cont'd)
O O
'o c,
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Table of Contents
Troubleshooting
