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2.5 Firewall

Firewall components to be judged include the holes and grommets for wiring, etc. as well as bracketry for the horn, air cleaner, and oil can. The firewall wiring terminal block, associated wiring, choke and throttle cables oil pressure tube, fuel filter inlet line, fuel and air filters and firewall bond components will also be judged at this point.

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2.5.1 Grommets

Firewall grommets were rubber from start of production thru approximately August ‘42. After this time, rubber grommets were replaced with grommets made of heavy brown/gray felt material. Rubber grommets, when installed should be of natural rubber (not shiny plastic), and have very rounded shoulders.

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2.5.2 Firewall brackets

Brackets are attached to the firewall for the purpose of mounting the air cleaner (left and right sides), horn and oil can. All these brackets were attached to the firewall prior to application of final paint to the body. As a result, the brackets and all attaching hardware should be painted body color.

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2.5.3 Fuel lines & Fuel Filter

Fuel lines: The Tank to Filter line should be painted OD. The Filter to Flexline fuel line is bare. Original compression (flare) nuts were heavy, square shouldered, S7 finished.

Fuel Filter: An AC bowltype fuel filter was mounted on the right side of the firewall from start of production thru approx. May 1945. The cast iron filter top is marked with a prominent script “f”. The cast iron top is painted OD, the fuel filter bowl is Cadmium or Zinc plated, silkscreened in black with an AC logo and servicing information. The firewall fuel filter was eliminated around the time of the introduction of the late ACM body which did not incorporate facilities for mounting the filter. This was accomplished sometime between body number 232581 (May ‘45) and body 243776 (June ‘45)*

Note: “Ord dept. report”, AAW #2 P223 states that this change was accomplished 7/17/44

* Per Lloyd White

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2.5.4 Air cleaner

An AC air cleaner was used from start of production thru March ‘42. This air cleaner is flatter and wider than the cylindrical Oaks filter used in standard production and requires a unique air horn to join it with the air crossover tube flex hose. This filter includes a red/orange servicing instruction decal.

The standard air cleaner for March ‘42 thru end of production was Oaks model 613300 oil bath air cleaner. Finish is a semigloss black japan except for the wire clips which secure the bottom bowl which are Zinc or Cadmium plate. The air cleaner is secured to the firewall brackets with stamped, S2 or S7 finished wing screws.

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2.5.5 Oil pressure gauge tubing

The oil pressure gauge tube extends through its hole in the firewall and is fastened to the lower part of the firewall with an S7 finished double strap clamp which is insulated from the tube with a short length of asphalt impregnated cotton tubing. The tubing clamp is attached to the firewall with an S7 finished, roundhead machine screw, lockwasher and nut.

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2.5.6 Oil can and bracket

The oil can clamp-bracket is painted OD. The oil can is manufactured by “Eagle” and is unpainted.

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