b. Cleaning and Inspection.
(3)
Install in reverse order.
(1) Clean oil pressure indicator with a soft
cloth dampened in an approved cleaning solvent, and
b. Cleaning, and Inspection.
dry thoroughly.
(1) Clean tachometer with a soft cloth
(2) Visually inspect indicator for broken glass
dampened in an approved cleaning solvent, then dry
or other damage. Inspect transmitter leads for good
thoroughly.
terminal connections at indicator. If transmitter checks
(2) Visually inspect tachometer for broken
out (para 3-84) but indicator does not operate, return to
glass and free movement of drive shaft. Replace a
direct support for calibration.
defective tachometer.
(3) Replace a defective oil pressure indicator,
or damaged mounting hardware.
3-141. Overspeed Governor Microswitch
(For
Engine Model 687C-1 DES)
3-144. Indicator (Warning) Light, Low Oil Pressure
a. Removal and Installation.
a. Removal and Installation.
(1) Refer to figure 3-70, tag and disconnect
(1) Refer to figure 3-116 and remove the low
two electrical leads, remove two screws securing switch
oil pressure indicator (warning) light.
to overspeed governor, then remove microswitch.
(2) Install in reverse order.
(2) Install in reverse order.
b. Cleaning, Inspection and Repair.
b. Cleaning, Inspection and Test.
(1) Clean all metal parts with an approved
(1) Clean microswitch with a soft cloth
cleaning solvent and dry thoroughly.
dampened in an approved cleaning solvent and dry
thoroughly.
(2) Visually inspect light for damage or
defect. Check that lamp is not burned out. Inspect red
(2) Visually inspect for corroded terminals
lens for cracks or breaks.
and damaged or weak arm contact.
(3) Repair by replacing a burned out lamp.
(3) Use a multimeter and test between
Replace a light that is defective, or when lens is broken.
normally open and normally closed contacts for
continuity. If continuity is shown, switch is defective.
Replace a damaged or defective microswitch.
3-145. Fuel Level In dicator
3-142. Ammeter
a. Removal and Installation.
(1) Refer to figure 8115 and remove fuel
a. Removal and Installation.
level indicator.
(1) Refer to figure 3-115 and remove the
(2) Install in reverse order.
ammeter.
(2) Install in reverse order.
b. Cleaning, Inspection and Repair.
(1) Clean
indicator
with
clean
cloth
dampened in an approved cleaning solvent and dry
b. Cleaning, Inspection and Test.
thoroughly.
(1) Clean ammeter with a soft cloth
(2) Visually inspect indicator for dents, broken
dampened in an approved cleaning solvent and dry
glass, or other damage. Inspect mounting hardware for
thoroughly.
burs, stripped threads, or other defect. Inspect electrical
(2) Visually inspect ammeter for corroded
leads for fraying insulation, broken wire, or loose
terminals, cracked glass, and other damage or defect.
terminals. Check indicator. for operation in conjunction
(3) Use a multimeter and check across
with transmitter (para 3-146).
terminals for continuity.
Replace a damaged or
(3) Repair by replacing defective indicator,
defective ammeter.
mounting hardware, or electrical lead.
3-146. Transmitter Fuel Level
3-143. Oil Pressure Indicator
a. Removal and Installation.
and remove fuel level transmitter. Install in reverse
(1) Refer to figure 3-115 and remove the oil
order.
pressure indicator.
(2) Install in reverse order.
3-120
