Vintage 1967-72 CHEV PICK-UP Spécifications Page 9

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9
901149 REV D 7/30/14, INST 67-72 CHEVY PICKUP wo AC EVAP KIT PG 9 OF 24
(2)1/4-20 X 1/2”
Hex Bolts
Front
Evaporator
Bracket
644080
Silicone
Back Side
of Fresh Air
Cap
Back Side
of Firewall
Cover
648218
1/4-20 X 1”
Bolt
Silicone
1/4” Flat
Washer
1/4-20 X 1”
Bolt
1/4-20 X 1”
Bolt
Drill
9/32” Hole
Drill
9/32” Hole
1/4” Flat
Washer
1/4” Nut w/
Star Washer
1/4” Nut w/
Star Washer
OEM
Hole
(6) #14 X 3/4”
Sheet Metal
Screws
Large
Grommet
33137-VUI
Grommet
33135-VUI
3/8”
Grommet
33144-VUI
1/4” Flat
Washer
Fresh Air
Cap
OEM
Hole
Fresh Air Cap
& Firewall Cover Installation
1.
2.
3.
4.
5.
6.
7.
Apply a 1/4” bead of silicone around the back side of the fresh air cap as shown in Figure 4, below.
Attach fresh air cap to firewall using a 1/4-20 x 1” bolt and washer (See Figure 4, below).
Apply a 1/4” bead of silicone around the back side of the firewall cover as shown below.
Install firewall cover onto firewall using (2) 1/4-20 x 1” hex bolts, (2) flat washers and (2) 1/4” nuts with star
washers in the OEM holes as shown below.
Use firewall cover as a template to drill (6) 3/16” holes in firewall, and then secure using #14 x 3/4” sheet
metal screws as shown below.
Using the firewall cover as a template, drill (2) 9/32” holes in the firewall as shown below.
Install grommets as shown below.
Bracket & Evaporator Hardline Installation
Figure 4
Figure 5
1.
2.
3.
On a workbench, install evaporator rear
bracket using (4) 1/4-20 x 1/2” hex
bolts.
Install hardlines with properly lubricated
O-rings (See Figure 9, Page 12, and
Figure 6, Page 10). NOTE: Wrap the
#10 fitting connections with press
tape (See Figure 6, Page 10).
Install evaporator front bracket onto
evaporator using (2) 1/4-20 x 1/2” hex
bolts, and tighten as shown in Figure 5,
below.
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