(2)
Install vent plug in oil pressure transmitter vent port using new O-ring.
NOTE: Lubricate O-rings with engine oil before installation.
B. With transmitter vent and pressure ports facing forward, position transmitter in shock mount. Transmitter vent port should be outboard of pressure port (with respect to the engine) (Fig. 401).
NOTE: Disregard orientation instructions, if any, on oil pressure transmitter.
545
Aug 01/74 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 79-32-11 Page 401
C. Connect oil pressure transmitter pressure line to union fittings in transmitter pressure port. Tighten pressure port fitting. Ensure that hose, hose end fittings and transmitter are arranged so that transmitter is free in all directions and tighten screw on shock mount clamp (Fig. 401).
NOTE: To minimize vibrations transmitted to the transmitter, each hose and its end fittings should lie in a single plane as viewed from front of engine.
D. Connect electrical connector to receptacle on aft side of oil pressure transmitter.
E. Connect bonding jumper to tapped hole on oil pressure transmitter.
F. Close engine left cowl panel.
G. Close OIL TEMP & PRESS circuit breaker on circuit breaker panel P6.
H. Check oil pressure transmitter operation per AMM 71-00/501, Test A.
NOTE: With the two engines in operation at the same power, make sure the oil pressure indication is approximately the same for the two engines.
H31464
Oil Pressure Transmitter Installation 545
79-32-11Page 402 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 01/98
LOW OIL PRESSURE WARNING SYSTEM - DESCRIPTION AND OPERATION
1. General
A. The low oil pressure warning system provides indication in the control cabin of low engine oil pressure. The system consists of two amber lights on the center instrument panel and a low oil pressure switch mounted on each engine (Fig. 1).
B. The low oil pressure switch senses the pressure differential between the oil pressure supply line and ambient cowl pressure. When oil pressure falls, the switch closes and completes a 28-volt dc circuit to illuminate the amber low oil pressure light on the center instrument panel.
2. Low Oil Pressure Switch
A. The low oil pressure switch senses oil supply pressure. High pressure in the supply line opens the switch contacts, breaks the circuit, and extinguishes the warning lights. Low pressure permits the switch to close, completing the circuit and illuminating the low oil pressure warning light. The switch operates at a differential pressure of 34 to 38 psi (Fig. 1).
B. The low oil pressure switch is mounted on the left side of the engine at approximately the 9 o'clock position slightly below the oil pressure transmitter (Fig. 1).
3. Low Oil Pressure Warning Light
A. The low oil pressure warning light is a press-to-test light that is connected to the airplane master test and master dim switches. The light for each engine is located on the upper right portion of the center instrument panel.
4. Operation
A. With electrical power applied and the engines inoperative, the low oil pressure switch will be closed energizing the warning lights. The lights will remain energized until the engines are started and the oil pressure in each engine is built up to approximately 38 psi. If a system malfunction causes an oil pressure drop in one engine, the switch will close before or at 34 psi, turning on the light.
545
Aug 1/74 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 79-33-0 Page 1
H27809
Low Oil Pressure Warning System 545
79-33-0 Figure 1 Aug 1/75
Page 2
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
LOW OIL PRESSURE WARNING SYSTEM - TROUBLE SHOOTING
1. General
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