ARMY TM 9-2815-254-24
AIRFORCE TO 38G1-94-2
SECTION III. GENERAL MAINTENANCE
3 - 3 .
This section provides general maintenance not found in other sections of Chapter 3.
Where applicable, prior to performing engine maintenance, ensure bat-
teries are disconnecting. Failure to observe this warning could results in
severe injury or death.
Refer to end item maintenance manual for removal of any components
necessary to gain access to engine.
It is strongly recommended that bolts or nuts securing cylinder heads, covers, and doors be tightened in prop-
When assembling an engine, it is always advisable nuts, bolts, and lockwashers that have been
removed from high strsss locations, in particular nuts an&or bolts from connecting rods and cylinder heads
should be replaced.
When assembling an engine it is always advisable to apply a small quantity of new engine lubricating oil
(MIL-L-2104) to all moving parts. After any maintenance work on engine has bean completed, lubricating oil
and fuel levels must be checked and all safety guards installed before operating.
When a new fan drive belt has been installed, check belt tension after first 20 hours of operation.
Wear protective overalls, and keep items of loose clothing dear of all hot and moving pans. Use protective
barrier cream when necessary.
Whenever possible, dean components and surrounding area before removing or disassembling. Take care
to exclude all dirt and debris from fuel injection equipment while it is being serviced.
Some parts are cemented with gasket compound with others being dry. Before assembly, remove all traces
of old gasket and compound. Take extreme care to exclude dirt from all gasket surfaces and gasket com-
pound from all tapped holes unless otherwise specified.
It is recommended that all oil seals are replaced once they have been removed from their original position.
Seals must be installed square in housing and all lip seals must be installed with lip facing lubricant to be re-
tained. A service tool should be used to install all oil seals and care must be taken to prevent damaging new
seal when it passes over shafts.
Replace ail nuts, bolts, capscrews, and studs with damaged threads. Do not use a tap-or die to repair dam-
aged threads which may impair the strength and closeness of the threads and is not recommended.
Do not allow grease or oil to enter a blind threaded hole as hydraulic action present when bolt or stud is
screwed in could split or stress housing.
To check or re-torque a bolt or nut, item is slackened a quarter of a turn and then tightened to specified value.
A steel ISO metric bolt, capscrew, or nut can be identified by the letter M either on head or one hexagon flat.
The strength grade will also be marked on top or one flat.
On nuts with identification marks on one face the frictional area of that surface will be reduced, therefore nut
should be installed with unmarked face towards component.
Service took are designed to aid disassembly and assembly procedures and their use will prevent possible
unnecessary damage to components. It is recommended that service tools are always used, some operations
cannot be safely carried out without aid of reIevant tooI.
DISASSEMBLY AND ASSEMBLY SEQUENCE FOR OVERHAUL.
The following paragraphs provide the sequence of disassembly and assembly for complete overhaul of the en-
gine. Step-by-step procedures can be found in remaining sections of Chapter 3.
3 - 1 2 C h a n g e 1