TM 5-3805-281-24-2
Crankshaft, Main Bearings, and Flywheel
MAIN BEARING CAP LINE BORE
SPECIFICATIONS
If any main bearing cap assembled I.D. is not within
specification, blank (generic) bearing caps are available
and must be line bored to specification. Replace individual
bearing caps as needed.
1. With crankshaft removed from cylinder block, install
main bearing caps without bearing inserts.
2. Tighten main bearing cap screws to 230 Nm
(170 lb-ft).
3. Measure I.D. of all bearing caps with an inside
micrometer. Main bearing cap I.D. should be 95.270--
95.320 mm (3.7508--3.7528 in.).
Measuring Main Bearing Cap Bores
If any main bearing cap assembled I.D. is not within
specification, blank (generic) bearing caps are
available and must be line bored to finished
specification. Replace individual bearing caps as
needed.
IMPORTANT: Main bearing cap line boring should be
done ONLY by experienced personnel
on equipment capable of maintaining
bore specifications.
Main Bearing Cap Bore--Specification
ID Without Bearings (Standard) ............................ 101.651--101.677 mm
(4.0020--4.0030 in.)
Diameter Variation.................................. 0.013 mm (0.0005 in.) maximum
Diameter Taper ...................................... 0.008 mm (0.0003 in.) maximum
Straightness Variation (Any.................... 0.038 mm (0.0015 in.) maximum
Bore-to-Adjacent Bore)
Straightness Variation (5 Center ............ 0.076 mm (0.0030 in.) maximum
Bore-to-End Bore
Centerline of Bore-to-Top Deck ................................ 352.35--352.50 mm
(13.872--13.878 in.)
RG,RG34710,1173
1923OCT971/1
