TM 5-3805-280-24-2
Crankshaft, Main Bearings and Flywheel
MEASURE ASSEMBLED ID OF MAIN
15
46
BEARING CAPS
1. Remove bearing inserts from caps and cylinder block.
Keep inserts in correct order if they are to be reused.
2. Clean and inspect caps for damage. Small burrs or
nicks on flat surfaces may be removed with a file. Use
a medium-grit polishing cloth to dress curved bearing
surfaces.
3. Install bearing caps (without bearings) in cylinder block.
Tighten cap screws to 135 Nm (100 lb-ft).
4. Measure ID of bearing cap bores.
Crankshaft Main Bearing Bore (Without Bearings)--Specification
ID ............................................................................... 84.455--84.481 mm
(3.3250--3.3260 in.)
Crankshaft Main Bearing Bore Centerline-to-Top
Deck--Specification
Distance................................................................. 337.896--337.972 mm
(13.3029--13.3059 in.)
IMPORTANT: When cylinder block is line bored,
dimension (A) from centerline of main
bearing bore to cylinder block top deck
will be changed. Piston may contact
A--Top Deck-to-Centerline Bearing Bore
cylinder head if this dimension is less
than specified above. Main bearing line
boring should be done ONLY by
experienced personnel on equipment
capable of maintaining bore
specifications.
5. If bearing caps are damaged or bore is not within
specification, install a new cap and line bore to
specified size. (See MEASURE MAIN BEARING ID
AND CRANKSHAFT JOURNAL OD, earlier in this
group.)
NOTE: Replacement bearing caps are supplied with
unfinished bearing bore.
RG,15,DT7436 1914NOV971/1
13-224
