TM 5-4310-356-14
assemble flywheel (8, fig. 5-9) to end of crankshaft with
(2) Fit connecting rod into high pressure
key (9) in place and secured by bolt (7) and nut (6).
piston (18) and secure with piston pin (17). Secure
piston pin with retaining rings (11). Assemble low
pressure piston (13) in a similar manner.
refer to paragraph 4-14b.
(3) Install piston ring set (48) on the low
5-5. Crankshaft and Crankcase
pressure piston and ring set (47) on the high pressure
a. Removal and Disassembly.
piston. When installing piston rings expand them
(1) Remove cylinder, piston and connecting
carefully and sufficiently to allow the ring to slide freely
rod assemblies and flywheel as described in paragraph
over the piston to the proper position. Starting with the
5-4a.
bottom ring, install piston ring in their proper grooves.
Stagger ring gaps so that they are not listed up.
cap valve body (23), lifting cap slowly away from
(4) Position of the connecting rod bearing
governor housing cover to contain spring (6). Remove
surface to the crankshaft is accomplished from the top
spring (6) and ball (25) and plunger (28). Remove
of the crankcase by reaching down along side
governor housing cover (27) slowly from housing (40) to
connecting rod to install lower element of connecting
contain spring sleeve (29), main spring (30) and flat
rod. Prior to attaching lower element of connecting rods
washer (31). Remove and discard gasket (37).
(16) press in oil dipper (15) if they were removed. Use
attaching bolts (10) and torque to 25 ft. lbs. torque.
(3) Remove baffle plate (38). The governor
weights (33) do not necessarily have to be removed
(5) Lubricate each piston and connecting rod
from the spindle (36) unless damaged. Remove spindle
assembly with a light coat of engine oil before installing
(36) and housing (40). Housing (40) also houses the
cylinder block. Invert cylinder head (37, fig.5-7) with
crankshaft main bearing assembly (43 and 44) and
piston ring clamps secured around the assembled
should be removed carefully to avoid damage to the
pistons and insert pistons into cylinder.
bearing. Remove and discard gasket (41).
(6) Carefully assemble the cylinder to the
CAUTION
crankcase, after first installing cylinder flange gasket
(38). Secure cylinder to crankcase with capscrews (36)
Before driving the crankshaft from
torque limits of 45 ft.-lbs. torque.
the crankcase, be sure the
(7) Normally, the intake (32 and 34) and
connecting rod journals are in an
exhaust (33 and 35) valves are replaced as an assembly
upright position.
if wear or malfunction occurs. In the event the valves
(4) Using a suitable puller remove bearing
were disassembled refer to figure 5-8 for reassembly.
(43) from crankshaft (42). Remove oil seal (45) from
When reassembling intake and exhaust valves be sure
crankcase (46) by pressing in from outside the
to seat large diameter of the spring (4, 18, 12 and 26) in
crankcase on the flywheel side of the case.
the cages (3, 13, 17 and 27) as shown.
(5) Do not remove the oil level gage (5) from
(8) Install valves into valve cavities of
the crankcase unless the gage is leaking or defective.
cylinder. Install manifold assemblies (23, 25, 29 and 31)
and tighten capscrews securely.
b. Cleaning, Inspection and Repair.
(1) Clean all parts in an approved cleaning
fig. 5-7) in the reverse order of the reference numbers
solvent and dry thoroughly.
shown on the exploded figure. Install muffler on low
pressure intake manifold (25) and secure with set screw
and distortion. Measure the crankcase journals for
(11).
wear. If the connecting rod journals measure 0.005 inch
(10) Install tubes and fittings using any logical
(0.0127 cm) out-of-round, refer to Table 5-2, replace the
sequence, refer to figure 5-7 for guidance. Be sure to
crankshaft.
observe precautions in handling intercooler tube (7) so
as not to damage cooling fins.
pitted, or scored rollers. Replace a defective bearing.
(11) After all tubes and fittings are installed,
5-18
