TM 5-4310-227-15
rotator far enough that the two re-
Caution: Do not over grind the
tainer locks (20) can be installed in
valves.
the recess at the end of the valve stem.
(4) Grind the other valve in a similar
NOte Apply a small amount of clean
manner. After both valves have been
grease to the inside of each retainer lock
fully seated, wipe off all excess grind-
so that the locks will stick in position on
ing compound.
the valve stem as the valve spring com-
pressor tool is removed.
h. Installation.
(4)
Slowly release the valve spring com-
(1) Position a valve spring (22) and valve
pressor tool and remove it from the
rotator (21) in the valve chamber.
cylinder and crankcase assembly (4),
(2) Install a valve (1) in its respective
Install the other valve (1) and related
(5)
valve stem guide (3) in the cylinder
components in a manner similar to
and crankcase assembly (4) and down
t h a t described in (1) through (4)
through the valve spring and valve
above.
rotator.
Adjust the valves (para 3-69).
(6)
(3) Using a valve spring compressor tool
Install the valve chamber access cov-
(7)
positioned under the valve rotator,
er (para 3-69).
compress the valve spring until the
Install the cylinder head (para 3-70).
valve stem end is through the valve
(8)
Section VII. ENGINE BASE, OIL PUMP, FUEL PUMP
(2) Remove the engine (para 3-61).
4-26. General
(3) Remove the 12 capscrews (19, fig.
a. Engine Base. The engine base supports
the engine and forms the bottom of the crank-
engine base (21) to the cylinder and
case. The base holds the engine lubricating
crankcase assembly (18). Remove the
oil. It is provided with an engine mounting
engine base and the engine base pa-
boss at each of the four corners and is fastened
per gasket (20).
to the crankcase by a series of capscrews and
b. Cleaninng, Inspection, and Repair.
lockwashers. Gasket paper between the base
(1) Clean the engine base and all appli-
and the lower part of the crankcase provides a
cable parts with an approved cleaning
seal to prevent oil from leaking out of the
solvent and dry thoroughly.
crankcase.
(2) Inspect the engine base for cracks,
b. Oil Pump. The oil pump is a plunger-
breaks, or other damage. Inspect for
type unit, mounted on the lower inside of the
metal burrs around the base mounting
cylinder and crankcase assembly. It is operated
flange on the engine.
by a cam-actuated plunger rod. The pump
(3) Inspect all applicable threaded parts
draws oil from the engine base and sprays it on
for damaged threads.
the internal warning components of the engine.
(4) Remove all metal burrs which might
tend to affect the mounting of the en-
gine base on the engine. Replace a
452-ENG and BMW-452-ENG-1 have a fuel
faulty engine base paper gasket. Re-
pump mounted on the engine as shown in fig-
place an engine base damaged beyond
ure 4-7.
repair.
c. Installation.
(1) Position the engine base paper gasket
a. Removal.
(20) and the engine base (21) on the
(1) Remove the crankcase drain plug and
cylinder and crankcase assembly (18)
and secure with the 12 lockwashers
drain the oil from the engine.
