| Tweet |
Custom Search
|
|
|
||
 TM 55-1905-221-14-4
6-43. ENGINE ALARMS WARNING LIGHTS AND SENDING UNITS.
LOCATION/ITEM
ACTION
REMARKS
a. General.
(1) Sending units (lube oil pressure switch and water temperature switch) are installed on each engine to
provide warnings which are indicated on the engine alarm panel located in the pilothouse.
(2) If the engine lubricating oil pressure falls below 10 psi (69 kpa) or if the water temperature exceeds 200
5 F (93 2.8o C) the respective warning lights will be activated and alert the operator to shut down the engine. The fuel
o
oil pressure switch activates the low oil pressure and high water temperature switches when the fuel pressure attains 20
psi (138 kpa) after starting the engine.
(3) To protect the circuit and switches, the circuit is not energized until the fuel oil pressure switch is closed.
The fuel oil pressure switches are installed in the fuel oil manifolds which are an integral part of the engine cylinder head
casting.
b. Testing.
(1) With engine stopped, place a jumper wire across the fuel oil pressure switch terminals.
(2) Move the engine alarm indicator switch on the distribution panel to the ON position. The lamp should light
for the circuit being tested.
6-958
|
||
|
||
