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 TM 55-1905-219-14-5
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 for lubricating the
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.
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