Failure to follow this caution may result In
damage to engine components.
During reassembly of internal engine compo-
nents, coat all components heavily with oil of the same
grade to be used in the crankcase. During the first few mo-
ments of operation, the engine will depend upon this lu-
brication. Refer to Section I Chapter 3 for proper
7-38. Crankshaft and Main Bearing Blocks
After each Installation step, check crankshaft
to be sure it is not frozen In place.
end of crankshaft. Using a puller, remove pump coupling
plate (18) at 325F in oven for 30 minutes, then press front
(39). Remove woodruff key (25).
and rear main bearings (21) into place, alining bearing
Remove rear bearing plate (18) from crankcase.
Remove gasket (22) and shims (23).
Remove two bolts (30), washers (31), bottom
center main bearing housing (32), and center bearing (34).
Oil the bearings surfaces and install crankshaft
Rotate crankshaft and remove upper center bearing
(37, fig. 7-27) from rear of crankcase through rear bearing
housing (36) and center bearing (35). Remove crankshaft
plate hole. Aline slots in front thrust washer (24) with
(37) through rear opening in crankcase.
7-37. Instruction Procedures
main bearing housing (32). Install bearing (35) into upper
The following paragraphs contain step-by-step
center bearing housing (36). Set the upper half of the
instructions necessary to reassemble the engine following
center main housing (36) on the crankshaft (37) and rotate
it into place. Be sure it is installed with the side marked
front toward the crankshaft gear. Set the two positioning
Prior to undertaking engine reassembly, certain
dowels (33) on the upper bearing mount. Install the center
major components such as the crankshaft, camshaft and
main bearing housing (32) and tighten the center main
governor, fuel pumps, and cylinder head should be
inspected and repaired as described in Section III, Repair
Place gasket (22) on each side of shim (23) and
place on rear bearing plate (18).
During reassembly of the engine, the work area
should be as clean as possible to reduce engine
Before tightening capscrews(19) ensure that
Use only clean, lint free cloth (item 24, Appen-
thrust washers (24) are in position over
dix E) for wiping engine parts. Oil and diesel fuel used
during the reassembly process must be clean. Handle all
parts carefully, especially bearings and machined surfaces.
Before installing bearing plate, tape keyway and
sharp edges on crankshaft to protect the oil seal during
installation. Place rear thrust washer (24) over locating
pins on rear bearing plate (18). Mount and secure rear
Ensure that all components are coated with
bearing plate (18) with six capscrews (19) and flatwashers
the proper grade of oil as they are assembled.