TM 55-1930 209 14&P-91
Table C-1. Preventive Maintenance Checks and Services for Electrical Power Systems (Continued)
B - Before
D - During
A - After
H - Hourly Interval
Interval
Procedures:
Equipment Is
Item
Item to be
Check for and have repaired
Not Ready/
No.
B D
A
H
Inspected
or adjusted as necessary
Available If:
250 hrs
(b) Install drain plugs. Fill system
with a commercially available
cleaning solution or 1 kg (2 lb)
Sodium Bisulfate (NaHSO4) per
40 L (10 US gal) water
(c) Start and run for 1/2 hour. Stop
engine
and
drain
cleaning
solution. (d) Flush system with
clean water until draining water is
dean. Do not run engine while
flushing.
(e) Install all drain plugs. Fill system
with neutralizing solution or 250 g
(1/2
lb)
Sodium
Carbonate
Crystals (Na2CO.H20) per 40 L
(10 US gal) water.
(f) Start and run engine for 10
minutes. Stop engine and drain -
neutralizing solution.
(g) Flush system with clean water,
until draining water is clean. Do
not run engine while flushing.
(h) Install all drain plugs.
(i) Fill engine with clean water. Run
the engine for 10 minutes and
drain. Repeat until drained water
is dean.
j) Refill with antifreeze and water to
provide protection to the lowest
expected ambient temperature.
(k) To help avoid airlocks, add coolant
slowly, bringing coolant level to
within l12 in of bottom of filler
pipe.
6) Start engine with radiator cap off. When
coolant level stabilizes add additional
water if necessary.
7) When coolant is at proper level and level
stabilizes, replace radiator cap.
C-31
