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:
1) The rubber impeller type water pump is
used for raw water circulation. It should
never be run in a dry condition (impeller
blades will tear). If the engine is not to be
operated for any length of time, it will be
necessary to pack the water pump with
MARFAK 2HD grease. (It this is not
available, glycerine may be used.) This is
effected by removing the pump end plate to
give access to the interior of the pump.
Insert the grease, or glycerine, thru the top-
most pipe connection (after removing the
rubber hose). Turn the engine over to
spread the lubricant. This treatment is
usually effective for about 3 months and
should be repeated if stored for a longer
period of time.
2) A heat exchanger usually consists of a
casing with a core (tube stack), which is the
actual heat exchanger. The oil cooler
usually
has
a
smaller
core
and
is
sometimes an integral part Of the engine
heat exchanger.
3) The heat exchanger and coolers should be
serviced every season. Depending on
operating conditions, this period may have
to
be
reduced.
Normal
operating
temperatures will vary slightly from engine
to engine because of design tolerances,
installation, and hull variations. Once the
normal operating temperature has been
established for a particular engine, any
excessive rise in temperature should be
considered
abnormal
and
immediately
investigated. If a cooling system problem is
suspected (or confirmed) the following
guidelines will provide a means for isolating
the cause.
C-42
