jet is positioned to lubricate the accessory drive pinion gear, the
second jet is designed to lubricate the number one main bearing
runner, and the third jet is positioned to lubricate the main
bearing. Surplus oil from the number one main bearing and pinion
gear also lubricates the accessory drive shaft support bearings. The
number one main bearing and the accessory drive pinion gear are
lubricated by oil from a transfer tube located in the accessory drive
carrier assembly. Oil under a constant pressure from the transfer
assembly lubricates the power shaft support bearing.
Oil from a third transfer passage is directed from the
main transfer assembly up through an inlet housing strut to the
powerdriven rotary booster pump. This pump is mounted on the
overspeed governor and tachometer drive assembly. The assembly
includes a pressure regulating valve that governs the output pressure
of the rotary torquemeter boost pump by circulating the excess
pressurized oil back to the inlet housing. The pressurized oil from
the rotary booster pump is directed back through an inlet housing
strut to the torquemeter cylinder, shown in figure 4.31A(C).
An offset passage in the overspeed governor mounting
flange directs engine oil to the strainer and metering cartridge in
the overspeed governor gearbox. An additional transfer passage from
the main transfer support assembly directs oil through internal
passages in the inlet housing to the power takeoff mounting flange.
This oil passes through a strainer and metering orifice,
which lubricates accessories driven by the engine, mounted on the
power takeoff. Oil flow to the rear section of the engine is
supplied from an oil pressure port at the 5 o'clock position in the
inlet housing through an external hose to a pressure manifold. The
manifold is mounted on the forward face of the diffuser housing. Oil
is directed from the bottom of the manifold through a strainer
mounted on the diffuser housing, shown at L in figure 4.31B, to the
No. 2 main bearing. Oil is directed from the top of this manifold
through an external hose and strainer, shown in H in figure 4.31B,
through the upper strut in the exhaust diffuser and directed through
the power turbine oil tube at F in figure 4.31B. The oil tube
consists of two jets; one directs oil to the forward face of the No.
4 bearing runner, and the second jet lubricates the aft face of the
No. 3 bearing runner. Oil is also directed through a horizontal tube
forward to the No. 3 bearing seal.
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