P92 Echo Super
Maintenance Manual
!
!
6.4 Exhaust Manifolds
!
With reference to figure 6-8, exhaust manifolds (1) are flanged to the engine and join the muffler separately (2). The
muffler also works as a heat exchanger (3) for carburetor and cabin heat.
The exhaust system must always be checked for possible cracks (ref. Periodic Inspection Table Section B). Close attention
must be given to the heat exchanger system which should be totally disassembled for inspection as cracks would allow
noxious fumes to be mixed with carburetor and cabin air heat.
!
!
!
!
Figure 6-8 Exhaust manifold
!
!
6.4.1
Cabin heat
Cabin heat system consists of the following (see Fig. 6-9):
!
Hot air vent near rudder pedal bar (1)
!
De-frost vents near windshield (2)
!
Heat exchanger (3)
A round knob located on lower left side of instrument panel controls cabin heat via the intercept valve located on lower part
of firewall, external to cabin.
!
6.4.2
Carburetor heat (if installed)
The system is also designed to direct carburetor air intake from scoop (5) and manifold (6) located on top portion of
firewall. Using the center valve (7), hot air from heat exchanger may be deviated towards carburetors.
A round knob located to center-left of instrument panel controls this valve.
The heating system does not require particular servicing except for periodic check of heat exchanger and of intercept valve
whose faulty closure may cause unwanted heat to enter cabin.
!
!
!
!
!
!
!
55
Revision Date: 10-29-2007
Revision Number: 3.01
