Cessna 177 SERIES Service Manual

CESSNA AIRCRAFT
COMPANY
MODEL 177
SERVICE MANUAL
NOTE:
Make sure the bushing hole in the
ring gear support that bears the identification
"0", is assembled
at the "0" identified crankshaft
flange bushing. This bushing
is
marked "0"
by an etching on the crankshaft flange
next to the bushing. The starter
ring gear must
be located correctly to assure
proper alignment of the timing marks
on the ring gear.
d. Clean propeller hub cavity and mating surfaces of propeller hub and ring gear support.
e. Lightly lubricate a new O-ring and
the crankshaft pilot with clean engine oil
and install O-ring in
propeller
hub.
f. Align
propeller mounting bolts with proper holes
in engine crank flange and slide propeller
carefully
over crankshaft
pilot until bolts can be started in crankshaft
flange bushing. Position propeller blades
to extend by the aft spinner bulkhead with ample clearance.
g.
Tighten bolts evenly
and work propeller
aft.
Tighten bolts to the torque value shown in figure 13-2.
h. Install safety wire through roll pins. Safety bolts in pairs.
i. Adjust alternator
drive belt tension as outlined
in Section 16.
j. Install spinner.
13-10A.
TIME BETWEEN OVERHAUL
(TBO).
Propeller overhaul shall coincide with engine
overhaul, but interval between overhauls
of the propeller
shall not exceed 1200 hours. Refer to Section 1 1 for engine time between overhaul (TBO) periods.
13-11.
GOVERNOR.
13-12. DESCRIPTION.
The
base mounted, engine-driven, centrifugal, single-acting
governor is mounted on the lower
right side
of the engine accessory drive housing.
The term single-acting refers to the
manner in which engine oil is
directed to the propeller to affect
changes in propeller blade pitch. This governor
produces oil pressure to
increase blade pitch. Decreased blade
pitch is produced by centrifugal twisting moment
of the rotating
propeller blades and the force of an
internal spring in the propeller, when governor
oil pressure is
relieved. Oil relieved
by the governor is permitted to return
from the propeller to the engine. Basically
the
governor consists
of an engine-driven gear pump with a pressure
relief valve, a pair of rotating fly weights
pivoted on a fly weight head, a spring-loaded
pilot valve operated by the fly weights
under the influence
of centrifugal force, and a control lever which varies the spring load on the pilot valve.
NOTE: Outward
physical appearance of specific governors
is the same, but internal parts determine
whether it uses oil pressure to increase
or decrease propeller blade pitch.
Always be sure the
correct governor is used with the propeller.
13-13. TROUBLE SHOOTING.
Since governor action is directly
related to the propeller pitch changing mechanism,
there are very few
governor troubles
that can be isolated with the governor
installed and operating. Failure of the propeller
to change pitch correctly might
be caused either by the governor or propeller.
Except for locating obvious
troubles, it is best to install a governor
known to be in good condition to check whether
the propeller or
the governor is at fault when trouble occurs in the propeller pitch change mechanism. If the trouble
disappears, the governor was at fault; if
the trouble persists, the propeller may be
at fault. Removal and
installation, rigging of control, high-speed
stop adjustment, desludging, and installation
of governor
mounting gasket
are not major repairs and may be accomplished
in the field. Repairs to propeller
governor are
classed as propeller major repairs in Part 43
of the Code of Federal Regulations, which also
defines who may accomplish such repairs.
13-14. REMOVAL.
a. Remove engine
cowling as required
for access.
b. Disconnect heater duct
and oil cooler ducts as required
for access to governor.
c. Disconnect control
from arm on governor and disconnect
control from bracket.
d.
Remove nuts and washers securing governor
to adapter on engine accessory housing
and work
governor
from mounting
studs.
D841-8-1 3 Temporary Revision
Number 5 -11 July 2005
Change 7
13-7
©Cessna Aircraft
Company

Cessna 177 SERIES Specifications

General

Manufacturer	Cessna
Engine Type	Piston
Wingspan	35 ft 6 in (10.82 m)
Seating Capacity	4
Number Built	4, 295
Engine	Lycoming O-360
Horsepower	180 hp
Maximum Takeoff Weight	2, 500 lb (1, 134 kg)