TM 5-3895-346-14
PREVENTATIVE MAINTENANCE
ENGINE OVERHAUL
Item 1 Lubricating Oil
Check the lubricating oil level with the engine stopped. If the engine has just been stopped, wait approximately
twenty minutes to allow the oil to drain back to the oil pan. Add the proper grade oil as required to maintain the
correct level on the dipstick (refer to Fuel and Oil Specifications).
CAUTION
Oil may be blown out through the crankcase breather if the crankcase is overfilled.
Make a visual check for oil leaks around the filters and the external oil lines.
Change the lubricating oil at 12,500 mile intervals (vehicle engines) or 150 hours (4500 mile) intervals
(nonvehicle engines). The drain interval may be established on the recommendations of an independent oil
analysis laboratory or the oil supplier (based upon the used oil sample analysis) until the most practical oil
change period has been determined. Select the proper grade of oil in accordance with the instructions given in
the Lubricating Oil Specifications in Fuel and Oil Specifications.
NOTE
If the lubricating oil is drained immediately after an engine has been run for some
time, most of the sediment will be in suspension and will drain readily.
Item 2 Fuel Tanks
Keep the fuel tank filled to reduce condensation to a minimum. Select the proper grade of fuel in accordance
with the Diesel Fuel Oil specifications in Fuel and Oil Specifications. Figure 1. Items 1 and 1O
Figure 1. Items 1and 10
Open the drain at the bottom of the fuel tank every 500 hours or 15,000 miles to drain off any water and/or
sediment.
Every 12 months or 20,000 miles (700 hours) tighten all fuel tank mountings and brackets. At the same time,
check the seal in the fuel tank cap, the breather hole in the cap, and the condition of the crossover fuel line.
Repair or replace the parts as necessary.
Diesel Fuel Contamination
The most common form of diesel fuel contamination is water. Water is harmful to fuel systems in itself, but it
also promotes the growth of microbiological organisms (microbes). These microbes clog fuel filters with a
"slime" and restrict fuel flow.
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