TM55-2840-251-23
Section III PRINCIPLES OF OPERATION (Continued)
1-12 LUBRICATION SYSTEM (Cont)
Oil-To-Fuel Heater (Cont)
If the fuel outlet temperature is above the ball valve
setting, the vernatherm plunger will be in an extended
position and the ball will be lifted off its seat by the
plunger. This permits the hot engine oil to flow through
the by-pass port and oil outlet without circulating through
the heat exchanger core. The fuel outlet temperature is
accordingly reduced.
Torquemeter
The torquemeter is located in the propeller gearbox and
the movement of its piston is controlled by the
movement of the first-stage ring gear. Rotation of the
ring gear is resisted by the helical splines, which impart
an axial movement to the ring gear and the piston. This
movement is felt by a metering valve, bleeding off oil
pressure to a transducer, which compares bleed off
pressure with engine oil pressure. The differential
indicates the torque.
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