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 TM 55-1925-204-12
(2) Accessory replacement. Install all of the
(6) Position a hoisting device over the engine,
accessories removed in b. (1) above by reversing the removal
place hooks in lifting brackets, remove engine mounting bolts,
procedure.
(a) Fill the lubrication system (LO 55-1925-
(7) Remove capscrews securing oil pan to the
204-12-5).
block, then remove oil pan. Remove the oil pump.
(b) Fill the cooling system.
(8) Use blocks high enough to allow access to the
connecting rod bearings and the lubricating oil pump, then
5-4. Pistons, Connecting Rods, and Piston Rings
lower engine to reset on these blocks.
a. General. The pistons have a protective coating
which permits close fitting of the piston. Four grooved rings
WARNING
are placed above the pin as a compression seal, and two oil
Keep hoisting device attached and taut to
control ings are placed below the pin to scrape excess
lubricating oil from the cylinder wall. The cylinder liners are
the engine after removing the cylinder
machined to form a slip fit in the cylinder block. Air inlet ports
head, to avoid engine falling over and
are located just above center and around the liner
possible injury to personnel.
circumference. When in place in the engine, a flange at the
top of each liner fits into a recess in the cylinder block.
(9) Remove the cylinder head (para 5-3).
b. Removal.
(10) Remove all carbon ridges from the cylinder
(1) Drain the lubrication and cooling systems.
liner (para 5-5).
(2) Remove necessary accessories to free the
(11) Remove cotterpins, nuts, and bearing caps
cylinder head for removal (para 5-2).
from lower end of connecting rod, then push piston and
(3) Disconnect fuel and raw water lines from the
connecting rod out through top of the cylinder (s).
engine.
(4) Remove the starter and generator (para 5-2)
NOTE
from engine.
Install connecting rod bearing cap on
(5) Disconnect the power generator (para 5-29)
connecting rod as each one is removed to
from the engine.
keep bearing halves matched.
NOTE
c.
Disassembly.
Slide engine away from generator at
(1) Clamp piston in a soft vise, punch a hole in
least 1/2 inch to clear dowel pin on
cap (13, fig. 5-16), and pry the cap from the piston (11).
generator housing.
5-19
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