LANCE
II SERVICE MANUAL
10-78. REMOVAL
AND REPLACEMENT
OF
CLUSTER
MOUNTED
INSTRUMENTS.
10-79. GENERAL.
Instrument
clusters
are located
on each
side of
the pilot's
control column.
Removal
of these
instruments
can be accomplished
by the following
procedure.
a. Remove
the face
panel
by pressing
it from
retainer
channel.
b. With the
face panel
removed,
the plastic
cover on the
cluster assembly
will
be
exposed. Remove
the cover and
cluster by removing
the two mounting
screws.
c. Remove the
connection to the
individual instrument
to be removed
and remove the
instrument
from
the cluster
assembly.
d.
Replace
instrument
in the reverse
order of
removal.
Check all mounting
and
connections
for
security.
10-80.
EXHAUST
GAS
TEMPERATURE
GAUGE.
(ALCOR)
10-81. GENERAL.
This
instrument,
which is commonly
referred
to as EGT,
is used
to aid
the pilot
in selecting
the economical
fuel-air
mixture for cruising
flight
at a power setting
of
75%
or less.
It is a
sensing device
to
monitor
the fuel-air
mixture
leaving
the engine
cylinders.
This
gauge
is adjustable.
If it is
found defective
after checking
with
troubleshooting
chart, it
should be replaced.
If the
leads to the
gauge are
defective in
any
way, they should
be replaced. When
replacing leads,
it is very important
to use the same
type
and length of wire
as the resistance
of the leads is critical
for the proper
operation of
this gauge.
On PA-32RT-300T
models
the EGT
probe
is mounted
in the exhaust
transition
area and
on
the 260
and
300 models
the
probe
is mounted
in the
exhaust
stack
below
the number
6
cylinder.
10-82.
REMOVAL
OF EGT
PROBE
AND
GAUGE.
a.
Disconnect
wires from the
EGT gauge at
the instrument
panel.
b. Remove four
bolts which secure
the gauge to the
instrument panel
and remove the
gauge.
c.
Remove wires
from the
wire harness
going to the
engine.
d.
Loosen the
nut or clamp
which secures
the EGT
probe to
the exhaust
system and
remove
the
probe.
10-82a. CLEANING AND INSPECTION.
Unless mechanical damage
is evident, broken
glass, bent or broken pointer, or
broken case, the following checks should
be performed
before removing
the instrument.
a. Remove probe
and check for
broken weld (at
the tip end) or
burnt off end.
Measured resistance
of probe should
be .8 ohms.
Clean the connections
with steel wool
before
reassembly.
b.
Disconnect lead
wires at instrument
and measure.
Resistance with
lead wires
connected to probe should be
3.3 ohms. Clean connections with
steel wool before
reassembly.
c.
With leads connected
to instrument,
heat probe with
propane torch to
dull red. The
meter should read up to the
fourth graduation or approximately 1500
F. Before making this
check, make sure that
the adjustment screw, which is located
in the rear of the instrument
case, is
in the center
of its travel.
If this screw
has been turned
to either
end of full
travel, it
will shut instrument off and no indication
will be shown on the pointer.
If meter still does
not
read, replace
it.
Revised:
9/2/78
INSTRUMENTS
2F7
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