Piper PA-34-200T Seneca II Service Manual Download

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PIPER SENECA II SERVICE MANUAL

SECTION VIII

POWER PLANT

8-1. INTRODUCTION.

The purpose of this section is to provide instructions for the removal, minor repair, service and
installation of the engine and components. For instructions on major repairs and overhauls, consult the
appropriate publication of the component manufacturer.

8-2. DESCRIPTION.

The PA-34-200T is powered by Teledyne Continental turbocharged, overhead valve, air cooled,
horizontally opposed, direct drive, wet sump engines rated 200 hp at sea level.

Each engine is enclosed by cowling consisting of two side panels, an upper and lower section and a nose
section. The cowl flap is an integral part of the lower cowl and is operated manually through a push-pull
cable arrangement from the cockpit.

Propellers are Hartzell full feathering, constant speed, each controlled by a governor mounted on the
engine supplying oil through the propeller shaft at various pressures. Oil pressure from the governor
moves the blades into low pitch (high RPM). The centrifugal twisting moment of the blade also tends to
move the blades into low pitch. Opposing these two forces is a force produced by a compressed air
charge between the cylinder head and the piston which tends to move the blades into high pitch in the
absence of governor oil pressure. Thus, feathering is accomplished by compressed air.

Refer to section IX for description of fuel system and primer operation.

8-2a. STANDARD PRACTICE - ENGINE.

The following suggestions should be applied wherever they are needed when working on the power plant.

To ensure proper reinstallation and/or assembly, TAG and mark all parts, clip, and brackets as to
their location prior to their removal and/or disassembly.

During removal of various tubes or engine parts, inspect them for indications of scoring, burning or
other undesirable conditions. To facilitate reinstallation, observe the location of each part during
removal. Tag any unserviceable part and/or units for investigation and possible repair.

Extreme care must be taken to prevent foreign matter from entering the engine, such as lockwire,
washers, nuts, dirt, etc. This precaution applies whenever work is done on the engine, either on or
off the aircraft. Suitable protective caps, plugs and covers must be used to protect all openings as
they are exposed.

NOTE: Dust caps used to protect open lines must always be installed OVER the tube ends and

NOT IN the tube ends. Flow through the lines may be blocked off if lines are inadvertently
installed with dust caps in the tube ends.

Should any items be dropped into the engine, the assembly process must stop and the item removed,
even though this may require considerable time and labor. Ensure that all parts are thoroughly clean
before assembling.

Never reuse any lockwire, lockwashers, tablocks, tabwashers or cotter pins. All lockwire and cotter
pins must fit snugly in holes drilled in studs and bolts for locking purposes. Cotter pins should be
installed so the head fits into the castellation of the nut, and unless otherwise specified, bend one
end of the pin back over the stud or bolt and the other end down flat against the nut. Use only
corrosion resistant steel lockwire and/or cotter pins. Bushing plugs shall be lockwired to the
assembly base or case. Do not lockwire the plug to the bushing.

Piper PA-34-200T Seneca II, Service Manual

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