Honda Prelude 1993 Service Manual page 167

Replacement
l. As illust.ated in the removal steps o{ this procedu.e,
use a commercially-available air-impact driver attach-
ment modified to tit the diameter of the valve guides.
In most cases, the same procedure can be done us-
ing Valve Guide Drivers and a conventional hammer.
Tool numbers are at the end of this procedure.
Y AVAIIAALE
Removal and Installation
VALVE GUIDE DR|VER, 5.S ftm
07742-d)10100
Select the proper replacement guides and chill them
in the freezer section of a retrigerator for about an
hour.
Use a hot plate or oven to evenly heat the cylinder
head to 3OOoF (150oC). Monitor the temoerature
with a cooking thermometer.
CAUTION:
a Do not us6 a torch; lt may warp th6 hoad.
a Do not get tho h6ad hotter rhan 3OOoF (150"C);
€xcesslvo heat may looron tho valvo soats,
a To avoid burns, uso hoavy glovos whon handling
tho h€Eted cylindsr head.
5.3 mm
lO.2'l in)
I
l r
t -
l_r
l
10.8 mm
10.42 Inl
2 .
VAI.VE GUIDE DBIVER
4 .
Working from the camshaft side, use the driver and
an air hammer to driver the guide about 2 mm
(O.1 in) towa.dsthe combustion chamber. This will
knock off some of the csrbon and make removal
easier.
CAUTION:
a Always wear satoty goggles or a tace shield whon
using th€ ai. hammot.
a Hold the air hamnrer dhectly in line with th€ valvo
guide to prev€nt damaging the driver.
Turn the head over and drive the guide out toward
the camshaft side of head.
VALVE GUIDE DRIVER,
COMMERCIAIIY AVAILABTI
lf a valve guide still won't move, d,ill it out with a
8 mm (5/16 inchl bit, then try again.
CAUTION: Drill guidos only in extrcmo cas€s; you
could damago tho cyllnd€r head lftho guide breaks,
Remove th€ new guide(sl trom ths refrigerator. one
at a time, as vou need them.
{cont'd}
<reDi-k
6 .
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