TM 5-3810-300-24 & P3
General Information
If parts are not to be used immediately after cleaning, dip them
Rust Preventive
in a suitable rust preventive compound. The rust preventive
compound should be removed before installing the parts in an
engine.
INSPECTION
Many service replacement parts are available in various
The purpose of parts inspection is to determine which parts
undersize and/or oversize as well as standard sizes. Also,
can be used and which must be replaced. Although the
service kits for reconditioning certain parts and service sets
engine overhaul specifications given throughout the text will
which include all of the parts necessary to complete a
aid in determining which parts should be replaced,
particular repair job are available.
considerable judgment must be exercised by the inspector.
A complete discussion of the proper methods of precision
The guiding factors in determining the usability of worn parts,
measuring and inspection are outside the scope of this
which are otherwise in good condition, is the clearance
manual. However, every shop should be equipped with
between the mating parts and the rate of wear on each of the
standard gages, such as dial bore gages, dial indicators, and
parts. If it is determined that the rate of wear will maintain the
inside and outside micrometers.
clearances within the specified maximum allowable until the
next overhaul period, the reinstallation of used parts may be
In addition to measuring the used parts after cleaning, the
justified. Rate of wear of a part is determined by dividing the
parts should be carefully inspected for cracks, scoring,
amount the part has worn by the hours it has operated.
chipping and other defects.
ASSEMBLY
machining operations J should be removed as far as possible
Following cleaning and inspection, the engine should be
from the assembly area.
assembled using new parts as determined by the inspection.
Particular attention should be paid to storing of parts and sub-
Use of the proper equipment and tools makes the job progress
assemblies, after removal and cleaning and prior to assembly,
faster and produces better results. Likewise, a suitable
in such a place or manner as to keep them clean. If there is
working space with proper lighting must be provided. The time
any doubt as to the cleanliness of such parts, they should be
and money invested in providing the proper tools, equipment
recleaned.
and space will be repaid many times.
When assembling an engine or any part thereof, refer to the
Keep the working space, the equipment, tools and engine
table of torque specifications at the end of each section for
assemblies and parts clean at all times. The area where
proper bolt, nut and stud torques.
assembly operations take place should, if possible, be located
away from the disassembly and cleaning operation. Also, any
WORK SAFELY
the governor is in the no fuel position. The possibility of
A serviceman can be severely injured if caught in the pulleys,
the engine firing by accidentally turning the fan or by
belts or fan of an engine that is accidentally started. To avoid
being bumped by another vehicle is minimized.
such a misfortune, take these precautions before starting to
work on an engine:
Some Safety Precautions To Observe When Working On
Disconnect the battery from the starting system by
The Engine
removing one or both of the battery cables. With the
electrical circuit disrupted, accidental contact with the
1. Consider the hazards of the job and wear protective ' gear
starter button will not produce an engine start.
such as safety glasses, safety shoes, hard hat, etc. to provide
adequate protection.
Make sure the mechanism provided at the governor for
stopping the engine is in the stop position. This will mean
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