4. FREQUENCY OF AOAP SAMPLE. Every 60 days, obtain sample of engine oil. Send this
sample to nearest AOAP laboratory. For additional reference, see TB 43-0210. Routine samples
are to be submitted at prescribed intervals. Samples should be taken as near prescribed interval
as possible. If sampling at prescribed interval is not possible, a 10 percent variance before or
after scheduled interval date or miles for sampling is permissible. The need for on-condition oil
changes will be determined by AOAP laboratory.
5. HARD TIME INTERVAL. If AOAP laboratory support is not available, drain oil and change
filter element/gasket every 1500 miles or annually. Hard time interval may be shortened if you are
operating equipment under adverse conditions.
6. ENGINE OIL FILTER. Filter element will be replaced each time an engine oil change IS required.
(See TM 9-2350-261-20 for engine oil filter element removal/installation instructions.)
Visual inspection of engine oil should not be justification to replace oil. Modern
detergent engine oils, especially in diesel engines, may appear dark/black in color
due to additives.
Drain oil only when hot (after engine operation). Allow oil to drain thoroughly.
ENGINE OIL DRAIN AND FILTER ELEMENT REPLACEMENT.
a. Remove hull bottom access cover (TM 9-2350-261-20).
b. Place suitable container of at least 5-gallon capacity under engine oil pan.
c. Remove plug from engine oil pan and drain oil into container.
d. Inspect plug and oil for metallic particles. If metal chips are found, notify direct support
e. Clean and install drain plug in engine oil pan.
f. Remove driver's access panel (TM 9-2350-266-10).
g. Remove engine oil filter drain plug, filter cover, gasket, and filter element.
Dry cleaning solvent burns easily, can cause skin rash, and can give off harmful
vapors. To avoid injury, keep away from open fire and use in well-ventilated area.
Wear protective clothing and rubber gloves.
h. Clean inside of cover with dry cleaning solvent P-D-680.
i. Install new filter element and gasket. Install filter cover. Make sure gasket is not crimped
and forms a tight seal. Install drain plug.
j. Fill engine with approximately 18 quarts of OE/HDO or OEA, as listed in Key, to bring
level between F and L marks on gauge rod.
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