D399, G399, D398, G398, D379, G379 ENGINES Caterpillar


Crankshaft

Usage:



Weight of crankshaft (approx.):

D399 and G399 Engine ... 1100 lbs.(498,95 kg)

D398 and G398 Engine ... 890 lbs.(403,70 kg)

D379 and G379 Engine ... 650 lbs.(294,84 kg)

(1) End clearance of crankshaft ... .008-.021 in.(0,203-0,533 mm)

Maximum permissible end clearance of crankshaft ... .035 in.(0,889 mm)

(2) Diameter of connecting rod journal ... 4.999-5.000 in.(126,97-127,00 mm)

Maximum permissible journal wear ... .010 in.(0,254 mm)

Maximum permissible out-of-roundness ... .006 in.(0,152 mm)

(3) Diameter of main bearing journal ... 5.749-5.750 in.(146,025-146,05 mm)

Clearance between main bearing and crankshaft ... .005-.008 in.(0,127-0,203 mm)

Maximum permissible clearance between bearing and crankshaft ... .015 in.(0,38 mm)

(4) Width of ring groove in thrower ... .255-.256 in.(6,477-6,502 mm)

Clearance between ring seal and groove ... .002 in.(0,05 mm)

Ring seal groove "run out" axial off center ... .006 in.(0,152 mm)

Ring seal gap should be in top position, engine block in operating position.

(5) Deflection of crankshaft (12 cyl. and 16 cyl. engines) ... .001 (0,025 mm)

Measure between cheeks of connecting rod throws next to the center main bearings.

Caterpillar Information System:

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