e. Installation.
(6) Remove bearing caps (par. 110).
Push the connecting rods and pistons
(1) Install the assembled crankshaft, gas-
up to the top of the cylinder bore.
ket, and housing in the crankcase and
(7) Remove the 4 capscrews (1, fig. 26)
secure the housing with four cap-
that secure the unloader housing (4)
screws (1).
to the crankcase.
(2) Position the pistons and connecting
rods on the crankshaft and secure with
b. Disassembly.
the bearing caps (par. 110).
(2), and unloader housing (4) from
(3) Install the crankshaft flywheel (par.
the crankcase (5).
Caution: Before driving the crank-
(4) Install the side plates (par. 98).
shaft from the crankcase, be sure the
(5) Install the unloader assembly (par.
connecting rod journals are in an up-
right position.
(6) Install the crankcase breather tube
(2) Use a suitable puller and remove the
unloader housing and ball bearing
(7) Install the release valve unloader tube
from the shaft. Remove the gasket.
(3) Press the bearing (2) from the hous-
112. Crankcase
ing.
a. Removal.
(4) Position the crankshaft (3) in a suit-
able press and remove the remaining
(1) Remove the pistons, connecting rods,
and cylinder block (par. 110).
ball bearing (2) from the shaft.
(2) Remove the crankshaft (par. 111).
(5) Remove the encased oil seal (1, fig. 25)
from the crankcase.
(3) Remove the four bolts, lockwashers,
flat washers, and nuts that secure the
c. Cleaning, Inspection, and Repair.
crankcase (1, fig. 24), to the air re-
(1) Clean all parts in an approved clean-
ceiver tank platform (6, fig. 3). Re-
ing solvent and dry thoroughly.
move the crankcase.
(2) Inspect the crankshaft for cracks,
(4) Remove the oil level gage (par. 103).
scores, and distortion. Measure the
b. Cleaning, Inspection, and Repair.
crankshaft bearing journals for wear.
If the connecting rod journals meas-
(1) Clean the crankcase with live steam, if
available, or an approved cleaning sol-
ure 0.005 inch out-of-round, replace
the crankshaft.
vent and dry thoroughly.
(3) Inspect the ball bearings for rough,
(2) Inspect the crankcase for cracks,
pitted, or scored bearings. Replace a
breaks, or other defects. Replace the
defective bearing.
crankcase if defective.
c. Installation.
d. Reassembly.
(1) Install the oil level gage (par. 103).
(1) Install the encased oil seal (1) in the
(2) Position the crankcase (1, fig. 24) on
crankcase (1, fig. 24).
the air receiver tank platform (6, fig.
(2) Press the ball bearing (2, fig. 26) on
the crankshaft (3). Press the other
lockwashers, flat washers, and nuts.
bearing (2) in the unloader housing
(4) and press the bearing and housing
(3) Install the crankshaft (par. 111).
(4) Install the pistons, connecting rods,
on the shaft.
and cylinder block (par. 110).
(3) Install a new gasket on the housing.
