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TM 9-2330-398-24
4-1.
ENGINE ASSEMBLY REPAIR (continued).
43.
Replace any flyballs that have flat spots or grooves.
44.
Replace cup if race surface is grooved or rough. Governor cup must be a free spinning fit on camshaft center pin,
but should be replaced if excessively loose or wobbly.
45.
Check distance to center pin that extends from camshaft gear. This distance must be 0.781 inch (1.984 cm) to
give proper travel distance for cup. If it is less, engine may race; if more, cup will not hold the balls properly. If
distance is too great, drive or press in center pin.If it is too small, replace pin; it cannot be removed without
damaging the surface.
46.
If aluminum ball spacer openings are badly worn, replace complete camshaft gear, which includes a new spacer
and thrust plate. Camshaft gear must be removed from camshaft.
47.
Clean out crankshaft and clear out all oil passages. Check journals for out-of-round, taper, grooving, or ridges.
Pay particular attention to ridges or grooves on either side of oil hole areas. Unusual conditions here often point to
previous neglect of oil changes. If journal dimensions are not within limits or journals are scored, metallize and
regrind crankshaft to standards listed in Table 4-1.
48.
Replace crankshaft bearings if clearances are greater than limits (Table 4-1) or if bearings are worn, grooved, or
broken.
49.
Inspect camshaft bearings. Bearings should be replaced if clearance to camshaft is greater than specified in
Table 4-1, or if bearings show cracks, breaks, burrs, excessive wear, or other defects. Camshaft-to-bearing
clearance should be 0.00i2 to 0.0037 inch.
d.
ASSEMBLY
CAUTION
• During assembly of engine, work area should be as clean as possible to reduce
engine contamination which can cause engine failure.
• Make sure all components are coated with the proper grade of oil as they are
assembled. Failure to properly coat with oil may cause damage to engine
components.
NOTE
• Use clean, rags for wiping engine parts. Oil and diesel fuel used during
assembly procedures must be clean. Handle all parts carefully,
especially bearings and machined surfaces.
• During assembly of internal engine components, coat all components
heavily with oil of same grade to be used in crankcase. During the first
few moments of operation, engine will depend of this lubrication.
• After each assembly step involving crankshaft, check crankshaft to be
sure it is not frozen in place.
4-20
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