Piper Pawnee Brave Service Manual page 288

PAWNEE BRAVE SERVICE MANUAL
SECTION VIIIB
POWER PLANT
LYCOMING - 375
8B-1. INTRODUCTION. This section covers the Lycoming power plant used
in the PA-36-375 aircraft,
and is comprised of Description, Removal and Installation instructions,
Corrective Maintenance,
Adjustments and Troubleshooting for the power plant and its associated components.
For further instructions and for major repairs, consult the appropriate publications
of the engine or
component manufacturer.
8B-2. DESCRIPTION. The PA-36-375 is powered by an Avco-Lycoming IO-720-D1CD
fuel injected,
naturally aspirated, horizontally opposed, air cooled, eight-cylinder, direct drive,
wet sump aircraft engine
rated at 375 horsepower. The engine is equipped with a starter, 70-ampere (Standard)
or 100-ampere
(Optional) 28-volt alternator, shielded ignition system, fuel pump and fuel selector.
The induction system consists of a cowl mounted airbox incorporating dual paper type
filter elements.
In the event of an air stoppage through the filters an alternate air source can
be opened by the use of a
control handle in the cockpit.
The exhaust system is of stainless steel and directs exhaust gases from cylinders
on each side of the
engine into seperate runner type collectors.
The propeller is a Hartzell constant speed unit, utilizing oil pressure from the
propeller governor to
move the blades into high pitch. The centrifugal twisting moment of the blades tend
to move them into low
pitch, in the absence of governor oil pressure.
8B-3. ENGINE COWLING.
8B-4. DESCRIPTION. The cowling completely encloses the engine and consists
of a reinforced plastic
lower nose and bottom section, a reinforced plastic upper nose section attached
to a flat aluminum top
section having piano type hinges along both sides, and two quick latching,
wrap around, side panel
assemblies consisting of two aluminum panels hinged together to provide easy access
to the engine.
8B-5. REMOVAL OF ENGINE COWLING. (Refer to Figure 8B-1.)
a.
Remove the screws (6) from the cowl top assembly, release the studs (9) and
cowl latch
assemblies (13), and remove the complete upper cowl and door assembly from the
aircraft.
b.
Remove the screws (6) that attach the upper nose bowl (1) to the lower cowl (16)
and remove
the upper nose bowl.
c.
Remove the bolts on the oil cooler to disconnect it from the lower cowl. Support
the cooler from
the engine mount using any adequate means to hold it near its mounted position.
d.
Remove the access cover to the induction air filters; remove the filter assembly and
then remove
the four screws securing the airbox to the lower cowl.
e.
Remove the screws from the bottom rear section of the lower cowl and the screws and
bolts form
the cowl supports (15). Lower the cowl from the aircraft.
ADDED: 1/19/78
POWER
PLANT LYCOMING 375
2A11