TM 5-3805-280-24-2
Crankshaft, Main Bearings and Flywheel
MEASURE CRANKSHAFT JOURNALS AND
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MAIN BEARING ID
1. With crankshaft removed from engine, assemble main
bearing caps with bearing inserts. Be sure inserts are
installed correctly.
2. Tighten main bearing cap screws to 135 Nm (100
lb-ft).
3. Measure and record main bearing assembled ID (A) at
several points with an inside micrometer.
4. Measure and record crankshaft main journal OD (B)
and rod journal OD (C) at several points around each
journal.
NOTE: If an undersized crankshaft has been installed,
measured dimensions will not meet specifications.
However, bearing-to-journal oil clearance must be
within specification. See CRANKSHAFT
GRINDING GUIDELINES later in this group.
5. Compare measurements with specifications given
below.
Crankshaft Main Bearing--Specification
ID ............................................................................... 79.391--79.433 mm
(3.1256--3.1273 in.)
Crankshaft Main Journal--Specification
OD ............................................................................. 79.324--79.350 mm
(3.1229--3.1240 in.)
Crankshaft Rod Journal--Specification
OD ..................................................................................... 77.800--77.826
mm(3.0629--3.0640 in.)
A--Main Bearing ID
Crankshaft Main Bearing-to-Journal--Specification
B--Main Journal OD
C--Rod Journal OD
Oil Clearance................................................................. 0.041--0.109 mm
(0.0016--0.0043 in.)
Crankshaft Main or Rod Journal--Specification
Maximum Taper...................................................... 0.010 mm (0.0004 in.)
Continued on next page
RG,15,DT7439 1914NOV971/2
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