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 TM 55-1905-220-14-5
3-68. BLOWER - MAINTENANCE INSTRUCTIONS.
a. The blower supplies the fresh air needed for combustion and scavenging. Its operation is similar to
that of a gear-type oil pump. Two hollow three-lobe rotors revolve with very close clearances in a housing
bolted to the cylinder block. To provide continuous and uniform displacement of air, the rotor lobes are made
with a helical (spiral) form.
b. Two timing gears, located in the rear end-plate of the rotor shafts, space the rotor lobes with a close
tolerance; therefore, as the lobes of the upper and lower rotors do not touch at any time, no lubrication is
required.
c. Oil seals located in the front and rear blower end plates prevent air leakage and also keep the oil used
d. The blower upper rotor is driven by the blower drive shaft which is coupled to the upper rotor timing
gear by means of a flexible drive hub located in the flywheel housing.
e. A flexible coupling, formed by an elliptical cam, driven by two bundles of leaf springs which ride on
four semi-cylindrical supports and spring seats is attached to the blower drive gear and prevents the transfer of
torque fluctuations to the blower.
f. The blower drive gear is mounted in the blower drive gear support and in addition to driving the
blower, drives the governor, water pump and fuel pump.
3-1216
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