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 TB 740-97-4
chambers and valves of compression-ignition engines will be preserved as follows:
(a) Four cycle spark ignition (gasoline) starting engines. The intake manifolds, the exhaust manifolds and the rocker arm
covers will be removed. The engine controls will be set for gasoline operation. The diesel or multifuel throttle will be completely
closed. The spark plug wires will be disconnected. Each intake valve will be manually depressed, and while each valve is held open,
one fourth of the determined amount (a above) of P-10 preservative lubricating oil, type I or II, grade 10 will be atomized sprayed into
each cylinder through the intake ports. The nozzle tip will be inserted into the port. The maximum air pressure for spraying will not
exceed approximately 25 psi. Each exhaust valve will then be manually depressed and while each valve is held open, one fourth of
the determined amount of the same type and grade of preservative lubricating oil specified will be atomized sprayed through each
open exhaust port into each cylinder. In addition to the determined amount, 1/4 ounce of the preservative lubricating oil specified
herein will be atomized sprayed into each starting valve port. With the valves, released, the engine crankshaft will then be rotated
until all pistons have completed a full cycle. The preservation cycle will then be repeated, after which the crankshaft will not be
rotated. The spark plugs will be removed. Care will be exercised to prevent damage to the threads, electrodes, and gaskets. The
spark plug threads will be coated with the preservative lubricating oil as specified. The spark plugs will be reinstalled. The exhaust
manifolds and intake manifolds will be reinstalled using new gaskets, if the new ones originally used show evidence of damage. The
rocker arm assemblies, springs, guides, valve stems, push rods, and the inside of the rocker arm covers will be sprayed with the
preservative lubricating oil as specified. The rocker arm covers will be blocked open in place with spacers 1/4 to 1/2 inch to permit
circulation of dry air over the rocker arm mechanism. If wood or metal spacers dissimilar to the block or cover are used, they will be
insulated at point of contact with barrier material conforming to MIL-B-121, grade A. A tag will be prepared indicating: "ENGINE
PRESERVED-DO NOT CRANK UNTIL ISSUED TO THE USER". The tag will be attached to the engine start controls.
(b) Four cycle, straight diesel or multifuel engines.
1. Engines with compression release start feature. The intake manifolds, the exhaust manifolds, and the rocker arm
covers will be removed. The fuel throttle will be completely closed. Each intake valve will be manually depressed, and while each
valve is held open, one fourth of the determined amount (a above) of P10, preservative lubricating oil, type I or II, grade 10, will be
atomized sprayed into each cylinder through each open intake port. The nozzle tip will be inserted into the open port. The maximum
air pressure for spraying will not exceed approximately 25 psi. Each exhaust valve will then be manually depressed and while each
valve is held open, one fourth of the determined amount of the preservative lubricating oil will be atomized sprayed into each cylinder
through each open exhaust port. The compression release will be set in the "OFF" position. With the valves released, the engine
crankshaft will be rotated with the starting motor until all pistons have completed a full 1 cycle. The preservation cycle will then be
repeated, after which the crankshaft will not be rotated. The exhaust manifolds and intake manifolds will be reinstalled using new
gaskets, if the ones originally used show evidence of damage. The rocker arm assemblies, springs, guides, valve stems, push rods,
and the inside of the rocker arm covers will be atomized sprayed with preservative lubricating oil as specified. The rocker arm covers
will be blocked open in place with spacers 1/4 to 1/2 inch to permit circulation of dry air over the rocker arm mechanism. If wood or
metal spacers dissimilar to the block or cover are used, they will be insulated at point of contact with barrier material conforming to
MIL-B-121, grade A. A tag will be prepared indicating: "ENGINE PRESERVED-DO NOT CRANK UNTIL ISSUED TO THE USER".
The tag will be attached near the engine start controls.
2. Engines without compression release start feature. The combustion chambers and valves will be preserved as
specified in e (1) above.
Exception: Due to the tendency of the engine to fire and run on the preservative lubricating oil, the crankshaft will be rocked with the
starting motor in lieu of continuous rotation. The engine will be tagged as specified in 1 above.
(c) Two cycle engines.
1. Engines with intake ports and valves. The fuel throttle will be completely closed. The air box covers on the side of the
engine opposite the blower will be removed. The exhaust manifolds and the rocker arm covers will be removed. The engine
crankshaft will be rotated with the starting motor until the piston in the cylinder to be sprayed is below the intake port.
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