3-98. PREPARING AN ENGINE FROM STORAGE TO SERVICE
Excess preservative oil in the combustion chamber can cause a hydraulic lock. Engine
damage will occur if started before oil is removed.
a. General Instructions. When an engine is removed from storage and put into service, operations listed below must be
b. Cleaning the Engine. Do the following to prepare engine for service:
(1) Remove all dirt from the outside of engine.
(2) Remove all paper covers and tape.
(3) Use solvent to remove rust preventative from engine exterior.
(4) Fill crankcase with clean oil.
(5) Flush cooling system and refill with permanent-type antifreeze in a mixture suitable for appropriate temperature range.
c. Inspecting the Engine. Check for proper adjustment of injectors, valves, and belts if engine was held in storage for six
months or less. Also check the oil filters, air filters, hose connections, and cylinder-head screws.
d. Additional Inspection. When engine has been in storage for six months or more, the following specific procedures must be
(1) Flush fuel system with fuel oil until fuel system is clean.
(2) Remove plug from oil filter head and run hot, light, mineral oil through oil passages. Rotate engine by hand three or four
times during the flushing operations.
(3) Remove all filter screens and make sure they are clean before starting the engine.
(4) Apply oil under pressure to lubricating system before starting engine.
(5) Ensure all preservative oil is flushed away.
FOLLOW-ON TASK: Perform procedures under Starting Repaired Engine (para. 3-91).