MCi Crusader II 1989 Maintenance Manual page 72

Date 1-1-89
Page .~--
3 -_ 1 _ _
MC-9 MAJNTENANCE MANUAL
EXTERIOR PANEL
FRAME STRUCTURE _ _ ,,
INSULATION - - - -
STRUCTURALPANEL---l1ot
BACKING PANEL _ _ .,
TRIM _ _ ,
COVERING--,,..
SEAT RAIL _ _ ,,,.-
COACH BODY
BODY PANELS
Figure 3-1. Sidewall Construction.
The MC-9 coach uses a welded, single-piece monocoque
frame. Below the belt rail 16 and 18 gauge stainless steel is used
while the upper body is framed in high tensile, low alloy steel,
primed before installation. Front body panels are 24 gauge
(.6 mm) stainless steel with a 20 gauge (1 mm) stainless steel
trim panel provided between the headlights. Removable
stainless steel iron moldings are used under the windshields
providing access to the windshield wipers and door control.
All side panels below the floor line are 24 gauge (.6 mm)
stainless steel fluted on 4" (102 mm) centers. See figure 3-1.
The exterior center roof and sidewall panels immediately
ielow the passenger win_dows are high tensile .064'' (1.6 mm)
prestressed primed and painted aluminum. The interior has
aluminum alloy panels riveted to the frame ~ith one panel
used to provide a continuous airway for the heated or cooled
air from the main ducts. The rear panel above the floor line is
24 gauge (.6 mm) smooth stainless steel and the lower panels
on the service doors are beaded 24 gauge (.6 mm) stainless
steel. Condensation drain tubes are provided within the frame.
The front roof cap and the rear crown panel are 1/a'' (3.17 mm)
thick molded fiberglass and incorporate molded indentations
for lamps. Main roof panels are .051" (1.29 mm) high tensile
aluminum prestretched on installation and riveted in place.
All exterior panels are riveted securely to the frame members.
Dissimilar metals are separated by mastic tape or mylar tape.
Roof and sidewall panels are insulated with 2" (51 mm) medium
density, fiberglass. compressed during application of interior
panels. with joints sealed with aluminum pigmented mastic.
Sidewall insulation is contained in waterproof envelopes. High
density fiberglass with an asbestos blanket is used for
insulation and sound-deadening at the rear bulkhead. A
double floor construction over the axles is filled with insulating
material to reduce the transfer of heat and noise to the inside
of
the coach.