TM 10-4320-344-24
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To maintain bearing bore alignment, make sure main bearing caps are installed
in their original positions.
(1) Install main bearing caps in their original positions in accordance with the
installation procedures given in paragraph 4.4.19.
(2) Measure main bearing bores. Bearing bores must be 3.0665-3.0670 inches
(77.8891-77.9018 mm). If bearing bores do not fail within these limits.
replace engine block (1).
(3) Check bearing bores for alignment. If crankshaft can be rotated freely by
hand, bores are properly aligned.
Check camshaft bearing bores of engine block (1). Internal diameter of bores
must be 2.1870-2.1889 inches (55.5498-55.59806 mm). If camshaft bearing bores
do not meet tolerance, replace engine block (1).
Check plugs in vertical oil passages in corners of engine block (1). Make
sure they are flush with or below top surface of block (1).
Check all machined accessory mounting pads for flatness, nicks, and burrs.
Remove nicks and burrs with a fine file.
Inspect all components for damage.
Replace all damaged or defective components.
4.4.21.3 Installation.
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g.
Install set screw (19) in engine block (1).
Damage to equipment could result if bearings are not correctly aligned.
• There are four camshaft bearings, one front bearing, two intermediate
bearings, and one rear bearing.
• Replacement camshaft bearings are precision cut and require no line
reaming.
• Ensure oil holes in bearings are aligned with oil holes in drilled
passageways of engine block.
Install new rear camshaft bearing (16), two intermediate camshaft bearings
(15), and front camshaft bearing (14) in engine block (1). Using bearing
driver, tap bearings into place.
Apply sealant and install four pipe plugs (12) in engine block (1).
Apply sealant and install six oil passage pipe plugs (11) and filler neck (10)
in engine block (1).
Inspect for leaks around filler neck (10), oil passage pipe plugs (11), and
pipe plugs (12). Remove, apply sealant, and reinstall leaking components.
Position two new gaskets (9) and side cover plates (8) on engine block (1) and
secure with twelve new lock washers (7) and bolts (6).
Position new gasket (5) and cover (4) on engine block (1) and secure with two
new lock washers (3) and nuts (2).
4-79
NOTE
NOTE
