TM 5-3895-346-14
FIRST START
OPERATIONS
ENGINE OPERATING INSTRUCTIONS
PREPARATION FOR STARTING ENGINE FIRST TIME
Before starting an engine for the first time, carefully read and follow these instructions. Attempting to run the
engine before studying these instructions may result in serious damage to the engine.
NOTE
When preparing to start a new or overhauled engine or an, engine which has been
in storage, perform all of the operations listed below. Before a routine start (at
each shift), see Daily Operations in the Lubrication and Preventive Maintenance
Chart.
Cooling System
Install all of the draincocks or plugs in the cooling system (draincocks are removed for shipping).
Open the cooling system vents, if the engine is so equipped.
Remove the filler cap and fill the cooling system with clean, soft water or a protective solution consisting of high
boiling point-type antifreeze, if the engine will be exposed to freezing temperatures. Refer to Engine Coolant.
Keep the liquid level about two inches below the filler neck to allow for fluid expansion.
Use a quality rust inhibitor if only water is used in the cooling system.
Close the vents, if used, after filling the cooling system.
Lubrication System
The lubricating oil film on the rotating parts and bearings of a new or overhauled engine, or one which has been
in storage, may be insufficient for proper lubrication when the engine is started for the first time.
It is recommended that the engine lubricating system be charged with a pressure prelubricator, set to supply a
minimum of 25 psi (172 kPa) oil pressure, to ensure an immediate flow of oil to all bearings at the initial engine
startup. The oil supply line should be attached to the engine so that oil under pressure is supplied to the main
oil gallery.
With the oil pan dry, use the prelubricator to prime the engine with sufficient oil to reach all bearing surfaces.
Use heavy-duty lubricating oil as specified under Lubricating Oil Specifications. Then remove the dipstick,
wipe it with a clean cloth, insert it, and remove it again to check the oil level in the oil pan. Add sufficient oil, if
necessary, to bring it to the full mark on the dipstick. Do not overfill.
If a pressure prelubricator is not available, fill the crankcase to the proper level with heavy-duty lubricating oil
as specified. Then prelubricate the upper engine parts by removing the valve rocker covers and pouring
lubricating oil, of the same grade and viscosity as used in the crankcase, over the rocker arms.
Air Cleaner
If the engine is equipped with oil bath air cleaners, fill the air cleaner oil cups to the proper level with clean
engine oil. Do not overfill.
Transmission
Fill the transmission case to the proper level with the lubricant specified under Lubrication and Preventive
Maintenance.
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