Honda Prelude 1993 Service Manual page 122

Replacement
1. As illustrated in the removal steps of this procedure,
use a commercially-available air-impact driver at-
tachment moditied to fit the diameter ot the valve
guides. In most cases, the same procedure can be
done using Valve Guide Drivers and a conventional
hammer. Tool numbers are at the end of this
Drocedure.
VALVE CUIDE DRIVER
Y AVAILAELE
87 mm
l3.rt:l In)
6,4 mm
{O.25ln}
l_l
+tr+- 57 mln
I
l2-24h,tl
lr_r
1 1 . 3 m m
O.44In)
R€moval and installation
VALVE GUIDE DRIVER. 6.6 mm
07942-6570100
Select the proper replacement guides and chillthem in
the freezer section of a refrigerator for about an hour.
Use a hotplate oroven to evenlyheatthe cylinderhead
to 3OOoF {150oC). Monitor the temperarure \^iith a
cooking thermometer.
CAUTION:
a Do not uss a lorch; h may wan rh€ h€ad.
. Do not got ths head hotr6r than 3O0oF (1soocl;
oxcasaivo hsat may loosen tho valve seats.
a To avoid burns. uso hoavy glovas when handling
ths heatod cylinde. hoad.
4. 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 oJ the carbon and make removal easier,
CATUION:
a Always wear sal€ty goggles 01 a taco shield when
using th€ aL hamm6..
. Hold the ak hammer directly in lin€ with tho valve
$.rido to pr8vont damaging the driver.
5, Turn the head over and drive the guide out toward the
camshaft side of head.
VALVE GUIDE DRIVER
COMMEBCIALLY AVAILABLE
lf a valve guide still won't move, drill it out with a
I mm (5/16 inch) bit, then try again.
CAUTION: Drill guides only in extremo casos; you
could damage tho cylinder head it th€ gukte breaks.
6. Remove the new guide(sl from the refrigerator, one at
a time, as you need them.
{cont'd)
l o
- \
R@ig
6 -5 3