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TM 5-2420-222-34
1-15.
INSPECTION INSTRUCTIONS (Con’t).
c.
Inspect metal lines, flexible lines (hoses), and metal fittings and connectors for the following:
(1)
Metal lines for sharp kinks, cracks, bad bends, and dents.
(2)
Flexible lines for fraying, evidence of leakage, and loose metal fittings or connectors.
(3)
Metal fittings and connectors for thread damage and worn or rounded hex heads.
d.
Inspect castings, forgings, and machined metal parts for the following:
(1)
Machined surfaces for nicks, burrs, raised metal wear, and other damage.
(2)
Inner and outer surfaces for breaks and cracks.
e.
Inspect bearings in accordance with TM 9-214.
1-16.
BEARING CLEARANCE GAGE.
a.
A soft plastic bearing clearance gage (plastigage) squeezed between parts such as a crankshaft journal and
a connecting rod or main bearing may be used to measure clearance between them.
b.
The bearing clearance gage is a specially molded plastic "wire" and is available in three measuring ranges
and colors:
PG-1 (Green)
0.001-0.003 in. (0.0254-0.0762 mm)
(Item 19, Appendix B)
PR-1 (Red)
0.002-0.006 in. (0.0508-0.1524 mm)
(Item 20, Appendix B)
PB-1 (Blue)
0.004-0.009 in. (0.1016-0.2286 mm)
(Item 18, Appendix B)
c.
Check bearing clearance as follows:
(1)
Remove bearing cap and wipe oil from bearing shell and crankshaft journal.
NOTE
When checking main bearing clearance with engine In position and main bearing
caps supporting weight of crankshaft and flywheel, a bad reading may result due to
weight of crankshaft and flywheel. To avoid a bad reading, support weight with a
Jack placed under counterweight next to bearing being checked.
(2)
Place bearing clearance gage full width of bearing shell, about y in. (6 mm) off-center.
(3)
Rotate crankshaft about 300 from bottom dead center (BDC) and install assembled bearing shell and
cap. Tighten screws to specified torque.
1-7
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