ARMY TM 9-2815-255-24
AIR FORCE TO 38G1-95-2
MARINE CORPS TM 2815-24/4
If bearings (5 and 6) are to be replaced, remove inserts from engine block. Otherwise, leave bearing inserts in
block until assembled ID has been measured.
Remove sleeve bearing (8), preformed packing (9), and dirt deflector (10) from front end of crankshaft.
Using an arbor press and gear puller, pull gear (11) from crankshaft (7). Remove key (12) from crankshaft.
3-44.2. Inspect And Measure.
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.
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.
Inspect gear for wear or damage.
Check crankshaft end play as follows:
It is recommended that crankshaft end play be measured prior to removing crankshaft to
determine condition of thrust bearings. Crankshaft and play may also be checked at front end of
Position dial indicator on face of flywheel.
Push crankshaft as far to rear of engine as possible.
Zero dial indicator.
Do not apply too much pressure with bar, as this could damage bearings.
Using a bar, gently pry crankshaft as far forward as possible.
End play for new two piece thrust bearing is 0.002 to 0.008 inch (0.05 to 0.20 mm). Maximum serviceable
end play is 0.015 inch (0.38 mm).
New thrust bearings will usually restore proper end play. If end play is not within specification
on two piece flanged thrust bearings, install a two piece thrust bearing (without flange) and
oversized thrust washers.
Inspect crankshaft as follows:
Clean crankshaft using dry cleaning solvent (P-D-680) and compressed air.