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905647 REV B 07/17/19, PG 20 OF 33
Firewall Cover Installation
Locate the bottom left mounting hole on the firewall cover, and install a 1/4-20 x 3/4” mounting bolt and a
1/4” pushnut bolt retainer (See Photos 1 & 2, below).
Apply a bead of silicone around the mating surface of the firewall cover (See Photo 2, below).
Install the firewall cover over the (2) 1/4-20 x 1 ½” studs, and secure it using (2) 1/4-20 nuts with star
washers to keep the firewall cover and evaporator unit in place (See Photo 3, below).
Install (2) 1/4-20 x 3/4” bolts into the remaining open mounting holes in the firewall cover and into the
evaporator firewall bracket (See Photo 4, below).
NOTE: Do not tighten at this time.
Remove the (2) 1/4-20 nuts with star washers and (2) 1/4-20 x 1 ½” studs from the firewall cover, and
replace them with (2) 1/4-20 x 3/4” bolts (See Photo 5, below).
NOTE: Do not tighten at this time.
In the passenger compartment, install a 9/32” washer and a 1/4-20 nut with star washer onto the bottom
right firewall cover bolt as shown in Photo 6, below.
NOTE: Do not tighten at this time.
Verify that the evaporator unit is level and square to the dash.
NOTE: To ensure proper drainage, it is
very important that the evaporator is level, both left-right and fore-aft. Check for level on the flat
portions of the case around the drain.
Tighten all of the mounting bolts at this time.
NOTE: Tighten the bolts on the firewall first. Adjust the
evaporator dash bracket as needed, and then tighten the bolts on the evaporator unit. Silicone or
seam sealer may be applied around the outer edge of the firewall cover.
NOTE: To ensure a watertight seal between the passenger compartment and the exterior, for all
bolts passing through the firewall, Vintage Air recommends coating the threads with silicone prior to
installation.
Photo 4
Install (2) 1/4-20 x 3/4”
Bolts into Remaining Holes
Photo 5
Replace Studs and Nuts with
(2) 1/4-20 x 3/4”
Bolts
Install 9/32” Washer and 1/4-20
Nut with Star Washer onto Bottom
Right Firewall Cover Bolt
Photo 6
Photo 3
Install Firewall Cover onto
(2) 1/4-20 x 1 ½” Studs
(2) 1/4-20 Nuts
with Star Washers
Silicone
Photo 2
1/4” Pushnut
Bolt Retainer
Passenger
Compartment
View
Install a 1/4-20 x 3/4” Bolt
Photo 1
Firewall Cover
640687
Engine
View
1.
2.
3.
4.
5.
6.
7.
8.
Summary of Contents for 561191
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