0100-26
\VILLYS
MODEL
"MB"
%-TON
4
x
4
GOVERNMENT TRUCK
FIG. 18-CRANIESHAFT SPROCKET
CRANKSHAFT REAR REARING SEAL
The rear main bearing is sealed by
a
wick type
packing, installed in the groove machined in the
crankcase, and
rear main bearing cap, Fig.
19.
To install a new seal at the rear main bearing
cap, insert the packing in the groove with the
fingers. Then using a round piece of wood or
steel,
rol1 the packing into the groove. When
rolling the packing, start at one end and
rol1 the
packing to the center of the groove. Then starting
from the other end again
rol1 towards the center.
By following the above procedure you are sure that
tlie wick is
firmly pressed into the bottom
d
the
groove.
The
smal1 portion of the packing which protrudes
from the groove at each end should be cut
flush
with the surface of tlie bearing cap. To prevent the
possibility of
pulling the packing out of the grooQe
while cutting off the ends it is recommended that a
round block of wood, the
Same diameter as the
crankshaft be used to hold the packing
firmly in
position while tlie ends are being cut
off.
FIG. 19-REAR MAIN BEARING
Should it be necessary to install a new seal in the
crankcase, it
wil1 require the removal of the engine
from the frame and the removal of the crankshaft.
The
Same procedure should be followed when
installing
a
crankcase seal as when installing
a
seal
in the bearing cap.
When
installing rear main bearing cap to case
a
little sealer should be put on the faces of cap
wliere it fits against the case. The rubber seal
packing that
goes between the main bearing cap
and the case
is
cut to a given length and wil1
protrude down from the case approximately
x".
When the oil pan
is
installed it wil1 force this
seal tightly into tlie holes and
prevent any oil
from leaking from the engine into the clutch hous-
ing. See Fig. 20.
If new crankshaft bearings are installed care
should be taken to see that the
drilled passages
line up with
drilled passages in the crankcase,
and that the bearings set
snugly over the dowel
pins.
E
m
1
FIG. ZGREAR HEARING CAP SEAL
CONNECTING ROD
The connecting rods are drop forged and are of
unusual length, measuring
9w
from center to
center. The babbitt bearings are of the replaceable
type, steel-backed, babbitt
lined, precision cut to
size and no fitting is required.
When installing the
upper half of rod bearing be
sure that the oil spray hole
lines up with the spray
hole in the connecting rod. Undersize rod bearings
are available in
.010"; ,020" and .030".
The connecting rod and piston assembly is
removed and installed from the top of the engine.
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