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 TM 10-3930-638-24&P
4-2. ENGINE MAINTENANCE (cont)
g. Camshaft and Bearings (cont).
ITEM
ACTION
REMARKS
STEP
LOCATION
INSPECTION AND REPAIR
8
Inspect
Check surfaces for wear, damage, and
a. Overall
Camshaft (9)
scoring. If any of these conditions
observed, replace camshaft
Measure front
Use micrometer. Measure each bearing sur-
b. Bearing surfaces
face in four places. Measure front and rear
and rear
surfaces again, 90 degrees from first
measurement. If outer diameter of any
bearing surface is less than 1.748 inches,
replace camshaft.
9
a. Overall
Inspect
Replace if cracked, damaged or worn
Camshaft
Use micrometer. Replace if thickness is
thrust plate
b. Thickness
Measure
less than 0.147 inches
(8)
Inspect
10
Replace if cracked, or if teeth damaged or
Camshaft gear (6)
missing
Replace if cracked, damaged or worn
11
Valve tappet
a. Overall
Inspect
Measure
Replace if less than 0.5605 inch
b. Stem
(3)
outer diameter
Use bore gage. Replace cylinder block if
a. Valve tappet
12
Measure
Cylinder block,
greater than 0.5650 inch
inside diameter
bores
bottom
Use bore gage and measure in two places,
Measure inside
b. Camshaft
90 degrees apart. Replace if greater than
bushings (10,
diameter
1.755 inches
11, and 12)
4-55
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