TM-9-2350-274-BD
M109/M110/M578 VEHICLES HOWITZER, MEDIUM, SELF-PROPELLED FULL-TRACKED
TECHNICAL MANUAL; OPERATORS, ORGANIZATIONAL DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
JANUARY 1984
TM-9-2350-274-BD - Page 71 of 219
TM 9-2350-274-BD
ENGINE
SECTION VII. Engine Structure And Internal Components
3-15. General.
Engine internal components are not easy BDAR fixes because of the tolerances and
balances necessary to contain the pressure and forces of the burning fuel, and the need
for mechanical integrity of the reciprocating and rotating parts. The best repair for
internal engine components is replacement parts from the supply system.
a. It is possible, however, to mix and match parts from two or more damaged
engines to reassemble one good engine with used parts. Example, if one engine has a
damaged cylinder set or top end, the good cylinder/head set can be matched with a
good, used short block to build a serviceable spare.
b. Certain internal engine component failures such as cam followers or rocker
arm shaft galling may be ignored. Other failures, such as broken rings and galled
pistons will result in engine destruction if the vehicle is operated.
3-19/(3-20
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