ARMY TM 9-2815-256-24
AIR FORCE TO 38G1-96-2
MARINE CORPS TM 2815-24/5
a.
Measure camshaft end play as follows:
(1) Use a dial indicator and measure camshaft end play, refer to FIGURE 3-109. New camshaft end play is
0.002 to 0.009 inch (0.05 to 0.23 mm). Maximum allowable end play is 0.015 inch (0.38 mm).
NOTE
If end play is excessive, check thrust plate thickness using a newthrust plate
and a feeler gage after camshaft is removed, refer to step c. If camshaft
end play is correct, measure timing gear backlash.
FIGURE 3-129. Measuring Camshaft End Play
b.
Clean and inspect camshaft and thrust plate as follows:
WARNING
Cleaning solvent is flammable and toxic to eyes, skin, and respiratory tract.
Skin/eye protection required. Avoid repeated/prolonged contact. Good
general ventilation is normally adequate.
WARNING
Compressed air used for cleaning can create airborne particles that may
enter the eyes. Pressure will not exceed 30 psig (207 kPa). Eye protection
required.
(1) Clean camshaft and thrust plate in solvent. Dry with compressed air.
(2) Visually inspect camshaft lobes and journals for wear or damage. Replace as necessary. New cam
followers can be used with old camshaft (if camshaft is serviceable). However, do not reuse old cam
followers with a new camshaft.
NOTE
Very light score marks can be found, but are acceptable if valve lift is within
specification. Pitting or galling dictates replacement. Refer to paragraph 3-
32.2. for valve lift measurement.
3-170
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