Troubleshooting - Gyros; Troubleshooting - Vacuum Pump; Maintenance Practices; Removal Of Vacuum Pump - Cessna T182 Series Service Manual

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