2
st
Edition, April 22
th
, 2008
P2002 Sierra
M A I N T E N A N C E M A N U A L
SECTION E
SYSTEMS
pag
.
E-8
4 - EXHAUST MANIFOLDS
With reference to figure E-7, exhaust manifolds (1) are flanged to the engine and
join the muffler separately (2). The muffler also works as a heat exchanger (3)
for carb. 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 al-
low noxious fumes to be mixed with carb and cabin air heat.
F
IGURE
E-7
E
XHAUST MANIFOLD
5 – CARBURETTORS HEAT AND CABIN HEAT SYSTEMS
The heating system (see Fig. E-6) exhaust vents are:
1. Hot air vent located near the rudder pedals (1).
2. De-frost vents located in proximity of the windshield (2).
The heating system is made of: A heat exchanger (3), a hot air shut-off valve (4),
and by the above mentioned exhaust outlet.
The shut-off valve is controlled by a knob located on the instrument panel.
Carburettors are fed by air provided by a ram air intake (5) and by the Airbox
(6). Using the valve (7) built in the Airbox (6) it is possible to select either a cold
air coming from the ram intake or by the heat exchanger. This valve is controlled
by a square shaped knob located on the instrument panel.
The heat system doesn’t require a specific maintenance schedule. It is only
strictly recommended to check the heat exchanger condition for cracks in order