Cessna 150 STANDARD Service Manual page 175

SECTION 13
PROPELLER
TABLE OF CONTENTS
PROPELLER
Description . . . . . . . .
Repair . . . . . . . .
Removal (Thru 1970 Models)
13-1. PROPELLER.
Page
13-1
13-1
13-1
13-1
13-2. DESCRIPTION. An all-metal, fixed-pitch
propeller, equipped with a spinner, is used on the
aircraft. Several types of spinner installations are
used, depending on the type and model-year of the
aircraft. Refer to figures 13-1 and 13- 2 for the dif-
ferent installations of the propellers and spinners.
13-3. REPAIR. Repair of a metal propeller first
involves evaluating the damage and determining
whether the repair is to be a major or minor one.
Federal AViation Regulations, Part 43 (FAR 43), and
Federal Aviation Agency Advisory Circular No. 43.13
(FAA AC No. 43.13), define major and minor repairs,
alterations and who may accomplish them. When
making repairs or alterations to a propeller, FAR
43, FAA AC No. 43.13 and the propeller manufac-
turer's instructions must be observed. The propel-
ler manufacturer's Service Manual may be obtained
from the Cessna Service Parts Center.
13-4. REMOVAL. (THRU 1970 MODELS.) (Refer to
figure 13-1.)
IWARNING'
Be sure magneto switch is in OFF position
before turning propeller.
a. Remove spinner.
NOTE
The small spinner mounting bracket (3) is
attached with two of the propeller mount-
ing bolts (6). The early large spinner (9)
is attached to two spinner bulkheads.
These bulkheads are secured by the pro-
peller mounting bolts (6) and will be freed
by removal of the bolts as the propeller
is removed. The later large spinner (10)
is attached to the rear bulkhead with a
forward supporting bulkhead. Note the
number of shims (11) behind the forward
bulkhead upon removal and retain these
shims. The rear bulkhead is secured by
the propeller mounting bolts (6) and is
removed as the propeller is removed.
The later large spinner, bulkheads and
attaching parts are used as spare parts
for the early large spinner.
Installation (Thru 1970 Models) . . . . .
13-11
Removal (Beginning with 1971 Models . . 13-1
Installation (Beginning with 1971 Models) . 13-3
b. Remove safety wire from mounting bolt heads
(6).
c. Remove bolts and pull propeller forward to re-
move. Use care to avoid damage to bulkheads as
propeller is removed,
13-5. INSTALLATION. (THRU 1970 MODELS.) (Re-
fer to figure 13-1.)
a. Clean mating surfaces of propeller, crankshaft
flange and spinner bulkheads.
IWARNING'
Be sure magneto switch is in OFF position
before turning crankshaft.
b. Locate top center of number one piston on its
compression stroke. Align the top center mark on
the crankshaft flange with parting surface of the
crankcase below the crankshaft.
c. With propeller blades in vertical pOSition, ro-
tate blades 30 degrees clockwise looking aft.
d. Install propeller and spinner bulkheads. The
spinner bulkheads must be pOSitioned so propeller
blades will emerge from the spinner with ample
clearance.
e. Tighten the mounting bolts (6) evenly to a torque
value of 300-320 lb-in (thru 1969 models) and 300-
360 lb-in (beginning with 1970 models).
f. Safety wire propeller mounting bolts (6). Do not
allow safety wire to cross the top of bolt head as this
would interfere with the installation of forward spin-
ner bulkhead and shims.
g. Install spinner. When installing the later type
spinner and bulkheads, add shims as required (maxi-
mum of 4) behind forward bulkhead to provide a snug
fit between bulkhead and spinner when the rear bulk-
head attachment holes are aligned.
13-6. REMOVAL. (Beginning with 1971 Models)
(Refer to figure 13-2. )
a. Remove spinner (1).
b. On aircraft serials 15072004 thru 15075781,
A1500227 thru A15000523, F15000659 thru F15001143
and FA15000082 and on, proceed as follows:
1. Remove forward bulkhead (3*). Retain any
shims (4*) between bulkhead and propeller.
IWARNING'
Be sure magneto switch is in OFF position
before turning propeller.
2. Remove safety wire from mounting bolt heads
(10*).
Change 3 13-1