4.4.19 Crankshaft Assembly Maintenance, Model 609-A. (Continued)
f .
Measure crankshaft (7) for the dimensions listed in Table 4-13.
Table 4-13.
Crankshaft Dimensions, Model 609-A.
Dimension
Minimum
Maximum
Main bearing journal
2.8704 inches (72.9084 mm)
2.8744 inches (73.0098 mm)
diameter - all
Main bearing journal
0.0020 inches (0.0508 mm)
out of round
Main bearing journal
0.0015 inches (0.0381 mm)
taper
Main bearing run-out
0.0030 inches (0.0762 mm)
at center
Connecting rod journal
2.3710 inches (60.2234 mm)
2.3740 inches (60.2996 mm)
diameter - all
Connecting rod journal
0.0020 inches (0.0508 mm)
out of round
Connecting rod journal
0.015 inches (0.3810 mm)
taper
F i l l e t r a d ii
0.1400 inches (3.5560 mm)
0.1700 inches (4.3180 mm)
Crankshaft main
0.0009 inches (0.0229 mm)
0.0034 inches (0.0864 mm)
bearing clearance
Seal surface
4.2950 inches (109.0930 mm)
4.3150 inches (109.6010 mm)
diameter - rear
Seal surface diameter -
1.8590 inches (47.2186 mm)
1.8750 inches (47.6250 mm)
f r o nt
Center main bearing
2.1240 inches (53.9496 mm)
2.1270 inches (54.0258 mm)
journal width
Main bearing journals
1.3125 inches (33.3375 mm)
Connecting rod journals
1.4950 inches (37.9730 mm)
1.5000 inches (38.1000 mm)
g .
Inspect crankshaft (7) for cracks invisible to the eye by magnetic particle,
fluorescent magnetic particle, or fluorescent penetrant method.
Inspect for
circumferential fillet cracks at the critical areas and 45° cracks starting
from either the critical fillet locations or the crankshaft holes.
If these
cracks are present, replace crankshaft (7).
h .
Replace all damaged or defective components.
4.4.19.3 Installation.
Ensure timing mark on crankshaft gear faces away from crankshaft.
a.
Install new woodruff key (11) on crankshaft (7).
b.
Using arbor press, install new crankshaft gear (10) on crankshaft (7).
c .
Lightly coat six new upper main bearings (8) and new upper center main
bearing (9) with engine assembly grease and install them in engine block.
d.
Lightly coat all journals of crankshaft (7) with engine assembly grease.
4-68
TM 10-4320-344-24