TM 5-3805-248-23-2
CAMSHAFT MAINTENANCE - CONTINUED
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INSPECTION - CONTINUED
3.
Use micrometer to measure journal diameters at each of the seven bearing locations on camshaft (12). Replace if any
journal diameter is less than 2.7495 in. (69.8373 mm).
4.
Use micrometer to measure and record cam height and width of each of the six intake and exhaust valve cams on cam-
shaft (12).
5.
Use measurements recorded in step 4 to determine camshaft lobe lift for each of the six intake and exhaust valve cams
on camshaft (12) by subtracting cam width from cam height. Remainder is camshaft lobe lift. Replace camshaft (12) if
any intake camshaft lobe lift is less than 0.3139 in. (7.973 mm) or if any exhaust camshaft lobe lift is less than 0.3408 in.
(8.656 mm).
EXHAUST CAMS
LOBE LIFT
JOURNALS
CAM
12
HEIGHT
INTAKE CAMS
CAM
WIDTH
394-1185
394-1186
6.
Inspect all other parts.
ASSEMBLY
CAUTION
Exercise care when installing key in camshaft. If necessary, tap key lightly with soft hammer to seat prop-
erly. Failure to follow this procedure could result in damage to equipment.
1.
Install key (15) in camshaft (12).
WARNING
Use insulated, heat-resistant gloves or tongs to handle extremely hot components. Failure to follow these
instructions may cause injury.
2.
Use oven to heat camshaft gear (16) for a minimum of two hours to a maximum temperature of 500F (260C).
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