TM 5-3810-300-24&P-3
1.7.2 CAMSHAFT, BALANCE SHAFT AND BEARINGS
drive gears are attached to the rear end of the shafts on
all engines.
To help maintain engine balance, a balance weight is
installed on the front end of each shaft.
Lubrication
Lubricating oil is supplied under pressure to the bearings
from the longitudinal main oil gallery through a horizontal
transverse passage at each end of the cylinder block,
then up the connecting vertical passages in each corner
of the block to the camshaft and balance shaft end
bearings. The cam-shaft intermediate bearings are
lubricated by the oil from the end bearings passing
through the drilled passage in the shaft.
Fig. 3 - Loosening Nut on Camshaft or Balance Shaft
The lower halves of the camshaft intermediate bearings
2. Remove all parts, accessories and assemblies that
are grooved along the horizontal surface that mates with
are necessary to facilitate mounting the engine on an
the upper halves of the bearings (Fig. 2). Oil from the
overhaul stand.
passage in the camshaft is forced through the milled
slots in the bearing and then out the grooves to furnish
3. Mount the engine on the overhaul stand. Before
additional oil to the cam follower assemblies. This
releasing the lifting sling, be sure that the engine is
permits the cam pocket to be filled rapidly to the
mounted securely.
operating oil level immediately after starting the engine.
4. Remove the cylinder head.
Remove Camshaft or Balance Shaft
5. Remove the flywheel and flywheel housing as
1. Drain the engine cooling system and remove the
outlined in Sections 1.4 and 1.5.
radiator and all attaching parts.
6. Remove the front balance weight cover and place a
wood block between the balance weights (Fig. 3) or
wedge a clean rag between the cam-shaft and
balance shaft drive gears on the rear of the engine.
7. Detach the gear nut retainer after removing the bolts.
8. Loosen the nuts on each end of the camshaft and
balance shaft. Remove the nut and lock washer
from the balance weight end of each shaft. Do not
remove the nuts from the drive gear end of the
shafts.
9. Remove the front balance weights.
10. Remove the thrust washers between the bear-ings
and the balance weight hubs on "B" and "C" engines.
11. Remove the lock screws that secure the cam-shaft
Fig. 2 - Camshaft Intermediate Bearing (Lower Half)
intermediate bearings.
Page 118
