TM 5-3895-359-14&P
Fig. 2. Woodruff Keys for Current Camshafts
Fig. 4. Loosening Nut on Camshaft or Balance
Shaft
The option data plate is marked to indicate whether an
engine was built with the former standard camshaft with
Service
advanced gear timing or the current camshaft which has
the required advance timing incorporated into the
Only the new camshafts (which have the required
camshaft.
advanced timing incorporated into the camshaft and
includes both the standard and offset Woodruff keys)
The required advanced timing built into the new
are serviced. Use the new camshafts and straight key
(current) camshafts eliminate the need for installing the
combination to service an advanced timed engine. Use
crankshaft gear one tooth advanced to the "A" position.
the new camshafts and the offset key to service a
This was accomplished by relocating the keyways at
standard timed engine.
each end of the camshaft. Continue to use the standard
(straight) Woodruff key (Fig. 2) with the new camshaft.
NOTE:
The offset key is identified with an S
IMPORTANT:
(standard) and an arrow stamped on
When using the new camshaft make
the face of the key.
With the
certain the gear train is NOT in the
keyways up, always install the offset
"A" position.
keys with the arrow pointing inboard
toward the center of the engine.
Lubrication
Lubricating oil is supplied under pressure to the bearings
from the 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
camshaft intermediate bearings are lubricated by the oil
from the end bearings passing through the drilled
passage in the shaft.
The lower halves of the camshaft intermediate bearings
are grooved along the horizontal surface that mates with
the upper halves of the bearings (Fig. 3). Oil from the
passage in the camshaft is forced through the milled
slots in the bearing and then out the grooves to furnish
Fig. 3. Camshaft Intermediate Bearing (Lower Half)
additional oil to the cam follower rollers. This permits
the cam pocket to be filled rapidly to the operating oil
level immediately after starting the engine.
10-2-107
