Cessna 150M - Accessories Removal; Engine Build-Up

9
11-11. CLEANING. The engine may be cleaned with
a suitable solvent, such as Stoddard solvent, or equi-
valent, then dried thoroughly.
ICAUTION\
Particular care should be given to elec-
trical equipment before cleaning. Sol-
vent should not be allowed to enter mag-
netos, starter, alternator, and the like.
Hence, protect these components before
saturating the engine with solvent. Cover
any fuel, oil and air openings on the en-
gine and accessories before washing the
engine with solvent. Caustic cleaning
solutions should be used cautiously and
should always be properly neutralized
after their use.
11-12. ACCESSORIES REMOVAL. Removal of en-
gine accessories for overhaul or for engine re-
placement involves stripping the engine of parts,
accessories, and components to reduce the engine
assembly to the bare engine. During removal, care-
fully examine removed items and tag defective
parts for repair or replacement with a new part.
NOTE
Items easily confused with similar items
should be tagged to provide a means of
identification when being installed on a
new
engine. All openings exposed by the
removal of an item should be closed by
installing a suitable cover or cap over
the opening. This will prevent entry of
foreign particles. If suitable covers are
not available, tape may be used to cover
the opening.
11-13. INSPECTION. For specific items to be in-
spected refer to engine manufacturer's manual.
a. Visually inspect the engine for loose nuts, bolts,
cracks and fin damage.
b. Inspect baffles, baffle seals and brackets for
cracks, deterioration and breakage.
c. Inspect all hoses for internal swelling, chafing
through protective plys, cuts, breaks, stiffness,
damaged threads and loose connections. Excessive
heat on hoses will cause them to become brittle and
easily broken. Hoses and lines are most likely to
crack or break near the end fittings and support
points.
d. Inspect for color bleaching of the end fittings or
severe discoloration of the hoses.
NOTE
Avoid excessive flexing and sharp bends
when examining hoses for stiffness.
e. All flexible fluid carrying hoses in the engine
compartment should be replaced at engine overhaul
or every five years, whichever occurs first.
f. For major engine repairs, refer to the manu-
facturer's overhaul and repair manual.
11-14. ENGINE BUILD-UP. Engine build-up con-
sists of installation of parts, accessories and com-
ponents to the basic engine to build-up an engine unit
ready for installation on the aircraft. All safety
wire, lockwashers, palnuts, elastic stop nuts, gas-
kets and rubber connections should be new parts.
11-15. INSTALLATION. Before installing the en-
gine on the aircraft, install any items that were re-
moved from the engine after it was removed from the
aircraft.
NOTE
Remove all protective covers, plugs, caps
and identification tags as each item is con-
nected or installed.
a. Hoist engine assembly to a point near the engine
mount.
b. Route controls, lines and hose in place as the
engine is positioned near the engine mount.
c. Install shock-mounts as shown in figure 11-2 and
install engine-to-mount bolts. Be sure ground straps
are in place at lower engine mount. Tighten engine-
to -mount bolts to torque value shown in figure 11-2.
d. Remove hoist and stand placed under tail tie-
down fitting.
e. Route throttle and mixture controls to the car-
buretor and connect, using washers and spacers as
noted in step "g" of paragraph 11-10.
NOTE
Throughout the aircraft fuel system, from
the tanks to the carburetor, use Never-Seez
RAS-4, (Snap-On Tools Corporation, Kenosha,
Wisconsin) or MIL-T-5544 thread compound
as a thread lubricant or to seal a leaking
connection. Apply compound to male fitting,
omitting the first two threads. Always be
sure that the compound, the residue of a
previously used compound, or any other
foreign material does not enter the fuel
system.
f. Connect lines and hose as follows:
1. Fuel hose at fuel strainer on firewall.
2. Primer line to engine at firewall.
3. Oil temperature bulb at engine.
4. Oil pressure hose at firewall.
5. Install all clamps attaching lines and hose to
engine, engine mount, or attached brackets.
g. Connect wires and cables as follows:
1. Electrical wires and wire shielding ground
at alternator.
ICAUTION\
When connecting starter cable, do not per-
mit starter terminal bolt to rotate. Rotation
of the bolt could break the conductor between
terminal and field coils causing the starter
to be inoperative.
2. Starter electrical cable at starter.
11-9