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904184 REV A 6/17/11, INST 73-80 CHEV P-UP w/ AC EVAP KIT PG 9 OF 27
FIGURE 5
DRILL HOLES AS SHOWN BELOW IN FIGURE 5
FIREWALL MODIFICATION CONT.
FIGURE 6
APPLY A 1/4” BEAD OF SILICONE AROUND THE BACK SIDE OF THE FIREWALL COVER AS SHOWN BELOW.
INSTALL FIREWALL COVER TO FIREWALL USING 1/4-20 x 3/4” HEX BOLT, 1/4“ FLAT WASHER, 1/4” NUT
w/ STARWASHER AND (8) #14 x 3/4“ SHEET METAL SCREWS AS SHOWN BELOW.
INSTALL GROMMETS AS SHOWN BELOW.
FIREWALL COVER INSTALLATION
LARGE
GROMMET
33137-VUI
GROMMET
33135-VUI
(8) #14 x 3/4”
SHEET METAL
SCREW
1/4-20 x 3/4”
BOLT
1/4” FLAT
WASHER
1/4” NUT w/
STAR WASHER
BACK SIDE OF
FIREWALL COVER
644086
SILICONE
GROMMET
33144-VUI
DRILL 3/16”
HOLE
DRILL 3/16”
HOLE
(2) DRILL 2”
HOLE
DRILL 3/16”
HOLE
OEM
HOLE
OEM
HOLE
(3) DRILL 1
⅛”
HOLE
OEM
HEATER
HOLES