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Fig. 19
71664C
AIR SHROUD
AND
COVER
Remove the capscrews which hold the shroud support
straps to the engine base. Loosen the governor spring
at the governor lever. Next, loosen and remove the
capscrew which holds the shrc;ud to the cylinder (this
is
located
above the manifold).
Next,
remove
the nuts which hold the air shroud cover
in place. Then,
remove
the capscrew and lockwasher
which holds the rear of the shroud to the cylinder.
The shroud and cover can then be pulled off the en-
gine. Never operate the engine with any part of the
shrouding damaged or
removed.
See Fig.
20.
CYLINDER HEAD
The cylinder head must be removed if it is necessary
to regrind valves or to do work on the
piston
rings or
connecting
rod. All of
the
cylinder head
bolts
are
plainly in view and can be easily removed. Bolts of
different lengths are used, but
these
can be properly
reassembled according to lhe various
lengths
of cyl-
inder
head
bosses. Before reassembling the cylinder
head, all carbon and lead deposits should
be
remov-
ed. It
is
recommended that a new cylinder head gas-
ket be used on reassembly
as
the old gasket will
be
compressed and hard, and it may ·not seal properly.
See
Fig. 21.
Tighten cy
Iinder
head screws, to 32
foot
pounds
torque.
PISTON
AND
CONNECTING
ROD
The connecting
rod
and piston assembly can be
re-
moved either through the top of
the
cylinder by means
of the connecting
rod
inspection plate opening, or
after
the
engine is entirely disassembled,
it
may be
removed
from the bottom of the
crankcase.
In
most
cases, it should not be necessary to
remove
the en-
gine base and in the explanation
following,
we
list
Ml·221
16
Fig.
20
71
680C
the
procedure for
removing
the connecting rod and
piston
without first removing
the engine base:
First,
remove
the cotter pins which lock the connecting rod
bolt
nuts
in
place.
On
later engines
pal
nuts
and plain
hexagon
nuts replaced
the slotted nuts and cotter
pins
.
Then, using
a socket wrench, loosen and re-
move
the
connecting rod bolt
nuts.
It
will be
noted
upon
inspection that both the con-
necting rod
and the connecting rod cap have an a rrow
or number on one side of
the
bolt boss. The cap must
be assembled to the
rod
so that the two marks are on
the same side. See Fig. 22.
After the two bolts are removed, the cap can also be
removed. Be sure the shims under the cap are kept
in their places. The piston
and rod
can then
be
push-
ed out of the
top
of the cylinder.
See
Fig. 23.
Wash
the
parts
thoroughly
in
Kerosene, after
s~raping
off
any carbon
deposits.
Fig.
21
775 16C
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