Operating instructions

5-7
FIGURE 5-7. HYDRAULIC LIFTER.
5-26. VALVE ROCKERS. Worn bushings may be
driven out with a suitable drift, and if properly
designed the same tool may be used to drive in new
bushings. The rocker must be supported on a ring
which will allow the old bushing to pass through.
Press the new bushing in flush with the rocker hub
after dipping it in clean lubricating oil. Ream the new
bushing to the specified diameter. It is advisable to
plug the oil holes with beeswax before reaming. Be
sure to remove the wax after reaming. Lightly break
the sharp edge at each end.
5-27. HYDRAULIC VALVE LIFTERS (See
Figure 5-7). Stand valve lifter on its flat end. Use a
small screwdriver and carefully pry snap ring (1) from
body groove. Hold down socket (2) with a pushrod
until ring has been removed. Invert lifter and catch
socket as it drops out. Insert a finger into plunger (3)
and withdraw plunger (3), spring (6) and check valve
assembly (4, 5). If plunger is stuck in body (7), hold
plunger down fully and scrape out carbon deposit. If
this obstruction cannot be removed, or if plunger is
seized by score marks, the entire assembly must be
replaced. Remove spring by turning as if to unwind it
while pulling outward. Be careful not to stretch spring
out of shape. Remove check valve housing from
plunger with a small screwdriver by prying against
plunger shoulder. Do not flip off housing. After
housing is loosened lift off, and remove plate (4) and
spring (6).
5-28. CONNECTING RODS.
CAUTION
In order to assure good dynamic balance,
connecting rod assemblies for new engines
are selected in pairs with a maximum weight
variation of 1/2 ounce in opposite bays. This
limit cannot be main- tained if material is
removed from any of the original in a set. If
a connecting rod must be replaced, specify
the weight limits when ordering.
5-29. PISTON PIN BUSHING REPLACEMENT.
The connecting rod does not need to be heated for this
operation. Press out the old bushing in an arbor press,
using a drift only slightly smaller than the bushing
O.D. Make sure that the rod bore is smooth. Dip the
new bushing in engine lubricating oil before placing it
in position, and locate the split as illustrated in Figure
5-9. (The position number is stamped on the rod and
cap bosses on the far side.) Ream or bore the new
bushing to the specified diameter and check alignment
as described in paragraph 6-20. The center-to-center
distance given in Figure 5-8 will be held automatically
if the bore is centered in the new bushing.
5-30. CRANKSHAFT ASSEMBLY. Lightly scored
crankpins and journals may be smoothed with a hard
Arkansas stone. Do not use a coarser abrasive. Do
not attempt to remove deep scoring or indications of
overheating which render the crankshaft
unserviceable. Remove the upstanding edges of small
nicks on softer surfaces with a hard Arkansas stone.
Polish crankpins and main journals with long strips of
crocus cloth, preferably while the shaft is rotated
about 100 RPM in a lathe. Due to the fact that gears
are shrunk fit to the crankshaft, it may be necessary to
dip the gear in oil heated to 300°F. before removal can
be accomplished. These operations should precede
magnetic particle inspection.
1. Ring, Retaining
2. Socket, Hydraulic lifter
3. Plunger
4. Plate, Check Valve
5. Housing
6. Spring, Plunger
7. Body, Valve Lifter