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 MIL-HDBK-1023/4
in the Southern Region). Oils used in diesels should at least meet the DG service classification.
Fill the crankcase of new or rebuilt engines with oil as recommended by the manufacturer.
Operate the unit at variable reduced loads (not to exceed 75 percent of full load) for
approximately 40 hours. Continue operation of the unit on normal load for approximately 40
hours; however, if chrome piston rings are installed, this time should be extended 8 hours. Drain
the crankcase while the engine is still hot and refill with multi-viscosity detergent oil.
d) Biannual checks
(1) Perform 2-year servicing as follows:
(a) Drain and flush engine-cooling system after operating the engine under load
for 1 hour.
(b) Remove covers and inspect generator bearings for wear and condition of
lubrication.
(c) Check condensers and diodes in line voltage sensing and transfer circuits.
e) Unscheduled Checks. Engines normally perform under a variety of climatic and
operational conditions. Therefore, a thorough analysis of the engine by a qualified technician
will be the determining factor in scheduling and defining the depth of overhaul for a particular
plant. All standby engines, after 10 years or 2,000 hours of operation, should be considered for
overhaul.
Table 18
Preventive Maintenance Inspection Schedule for
Standby Engine Generator Plants
W
M
Q
S
A
B
U
E
T
T
M
N
I
N
Maintenance Requirement
E
H
R
A
N
A
S
K
L
L
N
L
N
C
L
Y
Y
Y
Y
N
H
Y
1.
Do pre-start checks.
X
2.
Perform 1-hour load test.
X
3.
Clean engine/generator and surrounding area.
X
4.
Perform 3-hour load test.
X
5.
Perform annual check.
X
6.
Change oil.
X
7.
Perform 2-year servicing.
X
5.12.2
Maintenance Procedures. The maintenance of engine generators requires a skilled
mechanic. It is recommended that the person assigned to these duties be a graduate of a
technical school on types of engine generators similar to the one to be maintained. In addition,
the person should have had one or more years of experience as an automotive, truck, or diesel
engine mechanic and technician. If a qualified mechanic is not available on the airport
75
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