Cessna 182 1978 - Maintenance Practices; Removal of Vacuum Pump; Troubleshooting - Gyros; Troubleshooting - Vacuum Pump

MODEL
182 & T182 SERIES
SERVICE MANUAL
15-26. TROUBLE
SHOOTING - - GYROS
(Cont.)
TROUBLE
PROBABLE
CAUSE
REMEDY
EXCESSIVE DRIFT IN EITHER Central air filter dirty. Replace filter.
DIRECTION.
Low vacuum, relief valve im- Adjust or replace relief valve.
properly adjusted.
Faulty suction gage.
Replace suction
gage.
Vacuum pump
failure.
Replace pump.
Vacuum
line kinked or
Repair or replace damaged
lines,
leaking.
tighten
connections.
DIAL SPINS IN ONE
DIRECTION Operating limits have been
Replace instrument.
CONTINUOUSLY. exceeded.
Defective mechanism. Replace instrument.
15-27. TROUBLE
SHOOTING -- VACUUM
PUMP.
TROUBLE PROBABLE CAUSE REMEDY
EXCESSIVE OIL IN DISCHARGE.
Damaged engine drive seal.
Replace gasket.
HIGH
SUCTION.
Suction
relief valve
Replace
filter.
filter clogged.
LOW SUCTION.
Relief valve leaking.
Replace relief valve.
Vacuum pump failure. Replace vacuum pump.
15-28. MAINTENANCE
PRACTICES.
NOTE
Do not use
teflon tape, pipe
dope, or thread
lubricants
of any
type on
fitting threads,
and
When replacing a vacuum
system component,
avoid
over-tightening of
connections. All
ensure
all connections
are made correctly
to
filters
in vacuum system
must be
changed
avoid damage
to gyro
system.
When a
com-
when
installing
a new pump.
Failure
to do
ponent is removed,
cap off
and identify all
so will void
pump warranty.
DO NOT CON-
open
lines, hoses,
and fittings
to prevent dirt
NECT A PUMP
BACKWARDS.
Since the
from entering
system, and
to ensure proper
manifold check
valves provide
no pressure
reinstallation.
Upon component
replacement,
relief,
the pump will
be destroyed
in a mat-
check all hoses
carefully to
be sure they
are
ter of seconds
after starting
the engine.
clean and free of
debris, oil, solvent,
col-
lapsed inner
liners,
and
external
damage.
Replace old, hard,
cracked, or brittle
hoses, 15-28A.
REMOVAL OF
VACUUM PUMP.
Replace old, hard, cracked, to avoid possible a. Remove upper engine cowling in accordance with
particularly on pump inlet, to avoid possible
pump damage. On vacuum pump,
where hose procedures
in Section 11.
clearance is tight, making it difficult to rein-
stall hoses, apply a light film
of petrolatum side of
vacuum pump.
to the fitting.
Install
hoses by pushing
them
c. Identify
and disconnect
hose
on outlet
side of
straight on,
and do not wiggle hoses from
side vacuum pump.
to
side as this could
cause particles
to be cut
d.
Remove nuts,
lockwashers, and
flat washers
from
inside
of hose,
allowing particles
to
securing
vacuum
pump
to engine.
enter
system.
15-16