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:
WARNING
The coolant In an operating or recently
stopped engine Is very hot and under pres-
sure. if the filter pressure cap IS suddenly
removed the liquid may spurt and cause
Injury by scalding. Always stop an engine
and allow It to cool before removing the
cap. Once cool, loosen the cap slowly to
relieve the pressure.
(a) Check the coolant level in the header
tank and ensure the proper pressure
cap is being used. lb)
(b) Check the sea cock and strainer for
obstructions; clean where necessary.
(c) Check the seawater pump
Seawater pump
impeller. Replace if damaged.
impeller
Ensure that no pieces of the
damaged.
impeller (it broken) have passed into
the connecting pipes (i.e., inlet and
outlet) to restrict water flow.
(d) Check heat exchanger for obstructions
within the cooling core tubes on the
seawater side. Once the end cap
and/or
plates
are
removed,
any
scaling within the core tubes can be
removed by passing a rod (slightly
smaller than the internal bore) thru
the tubes. Do not use excessive force
when pushing the rod thru the tubes.
(e) If the tubes are so dogged that a rod
can not be passed thru them, the core
will have to be removed from its
casing and boiled in a caustic soda
solution. Commercial cooling system
cleaners
can
be
used
for
this
purpose.
Reassemble
with
new
gaskets, seals, and ’ rings.
(f) If a reduced power and/or excessive
smoke condition exists in addition to
an increase in coolant temperature
with a turbocharged engine having an
air charge cooler intercooler), check
the intercooler and, if necessary,
clean
as
described
for
heat
exchangers.
C-43
