ARMY TM 9-6115-484-34
AIR FORCE TO 35C2-3-445-2
NAVY NAVFAC P-8-624-34
Section VI MAINTENANCE OF INTAKE AND EXHAUST SYSTEMS AND BREATHER
344. GENERAL.
a. The intake system consists of a dry type air cleaner assembly with a reusable type filter element. The
assembly removes dust and dirt from the engine combustion air. It is equipped with a restriction transducer. The
restriction transducer measures vacuum in the air cleaner housing. When the filter element becomes sufficiently
clogged that the vacuum begins to impair engine performance, the restriction transducer transmits an electrical —
impulse to the air cleaner condition indicator on the engine control panel.
b. The exhaust system consists of a muffler assembly. The system muffles the noise of engine operation
and provides a means of expelling exhaust fumes from the generator set. The exhaust pipe end of the muffler
assembly is fitted with a rain cap which prevents the entry of foreign material when the engine is not operating.
c. The breather system provides an escape for gases which accumulate in the engine crankcase during
engine operation. The gases pass through the breather which traps oil vapors, and is drawn into the engine air
cleaner housing through the breather tube.
3-45. AIR CLEANER ASSEMBLY.
Refer to the Operator and Unit Maintenance Manual for air cleaner assembly maintenance procedures.
3-46. EXHAUST PIPE AND MUFFLER.
Refer to the Operator and Unit Maintenance Manual for exhaust pipe and muffler maintenance procedures.
3-47. BREATHER AND BREATHER TUBE.
Refer to the Operator and Unit Maintenance Manual for breather and breather tube removal procedure.
Section
VII.
MAINTENANCE
OF
ENGINE
ASSEMBLY
3-48. GENERAL.
a. The engine assembly is a four cylinder, four cycle, fuel injected, compression ignition, liquid cooled diesel
engine. The assembly consists of the cylinder head, rocker arm assembly, timing gears and housing, camshaft,
flywheel and flywheel housing, main bearings and crankshaft, piston and connecting rod assembly, and cylinder
block.
b. The cylinder head is a one piece casting and is detachable. Valve seats are part of the casting, but valve
guides are removable.
c. The rocker arm assembly is mounted on the cylinder head. It functions to open and close the valves.
d. The timing gears determine the sequence of valve opening and fuel injection. The gears are enclosed in a
housing, the cover of which contains the front crankcase oil seal.
e. The cam shaft actuates the rocker arm assembly which operates the valves. It is driven by a gear which
meshes with the crankshaft gear.
f. The flywheel is made of cast iron. It is machined to accommodate the coupling disc of the generator
assembly. The flywheel is attached to the crankshaft by six bolts, one of which is off center. This permits the
flywheel to be installed in only one position for timing purposes. The flywheel housing serves as a cover for the
rear of the cylinder block and oil pan and as a partial enclosure for the flywheel. It provides the mounting for the
starter assembly and also contains the rear crankshaft seal.
g. The crankshaft has five main bearing journals and four connecting rod bearing journals. This arrangement
places each connecting rod journal between two main bearing journals. All bearing journals are surface
hardened and are drilled for oil passages.
3-100
