TM-9-2815-205-24

TM-9-2815-205-24 - Page 736 of 856

MEASUREMENTS - Continued

Measure intermediate main bearing journal runout with dial indicator with magnetic base. Support crankshaft

at front and rear journals on inverted engine block with only front and rear upper bearing shells in place.

When high spots of run out on adjacent journals are in opposite directions, sum must not exceed 0.003 in.

(0.08 mm) total. When high spots of run out on adjacent journals are in same direction, difference must not

exceed 0.003 in. (0.08 mm). When high spots of runout on adjacent journals are at right angles, sum must

not exceed 0.004 in. (0.10 mm) or each journal must not exceed 0.002 in. (0.05 mm).

NOTE

Maximum clearance between connecting rod journal and bearing shell is 0.0041 in.

(0.104 mm) (with new shells). Maximum clearance between main bearing journal and

bearing shell is 0.0040 in. (0.102 mm) (with new shells). Main bearing journal taper or

out-of-round must not exceed 0.003 in. (0.08 mm). Replace crankshaft if measurements

exceed limits.

Measure all main and connecting rod bearing journals. Measure journals at several places on circumference

so that taper (calculated from two end outside diameter measurements of journal), out-of-round, and bearing

clearances can be determined. Measurements must be accurate to nearest 0.0002 in. (0.005 mm).

Measure crankshaft thrust surfaces at points (Figure 5, A) and (Figure 5, B), Dimension (Figure 5, A) must

be 1.299–1.301 in. (32.99–33.05 mm) and dimension (Figure 5, B) must be 1.34 in. (34.0 mm).

MAINT_397

Figure 5.

Crankshaft Main Bearing Journal Runout Check.

END OF TASK

TM 9-2815-205-24

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