To replace the exhaust valves, valve
reinstalled in their original posi-
guides and valve seat inserts, the cylin-
tions.
der head must be removed.
R e m o v e Rocker Arms and Shaft
Inspection
1. Clean and remove the valve rocker
Wash the rocker arms, shaft, brackets
cover.
and bolts with clean fuel oil. Use a small
wire to clean out the drilled oil passages
2. Remove the fuel pipes from the injec-
in the rocker arms and rocker shaft
tor and the fuel connectors.
bolts. Dry the parts with compressed
air.
NOTE
Inspect the rocker arm shaft and rocker
Immediately after removing the fuel
arm bushings for wear. A maximum
shaft to bushing clearance of 0.004" is
pipes, cover the injector fuel inlet
and outlet openings with shipping
allowable with used parts. Service re-
caps to prevent dirt or foreign ma-
placement bushings must be reamed to
terial from entering.
size after installation.
Inspect the rocker arms for galling or
3. Turn the crankshaft, or crank the
wear on the pallets (valve or injector
engine with the starting motor, to bring
contact surfaces). If worn, the surface
the injector and valve rocker arms in line
may be refaced up to a maximum of
horizontally.
0.010". However, proceed with caution
when surface grinding to avoid overheat-
ing the rocker arm. Maintain the radius
a n d finish as close to the original surface
as possible. Also inspect the valve
Do not bar the crankshaft in a left
bridges for wear.
hand direction of rotation with a
wrench or barring tool on the
c r a n k s h a f t bolt, or the bolt may be
R e m o v e Cam Follower and Push Rod
loosened.
( w i t h Cylinder Head on Engine)
When removing the cam followers and as-
4 . Remove the two bolts which secure the
sociated parts, tag them so they may be
rocker arm shaft brackets to the cylinder
reinstalled in their original location.
head. Remove the brackets and shaft.
To remove a push rod, spring, spring
NOTE
seats and cam followers from the top of
the cylinder head, proceed as follows:
When removing the rocker arm
shaft, fold the three rocker arms
1. Remove the rocker arm shaft and
back just far enough so the shaft
brackets as outlined under "Remove
can be removed. Do not force the
Rocker Arms and Shaft."
rocker arms all the way back with
the shaft in place as this may im-
2. Loosen the lock nut and unscrew the
pose a load that could bend the
rocker arm from the push rod to be re-
push rods.
moved. Remove the lock nut.
3. Install remover J 3092-01, a flat wash-
5. Loosen the lock nuts at the upper
er and the lock nut on the push rod,
ends of the push rods, next to the clev-
with the lower end of the tool resting on
ies, a n d u n s c r e w t h e r o c k e r a r m s f r o m
the upper spring seat.
the push rods.
4. Thread the nut down to compress the
spring.
NOTE
If the rocker arms and shafts from
5. Remove the spring seat retainer from
the groove in the cylinder head (see
two or more cylinder are to be re-
moved, t a g t h e m s o t h e y m a y b e
Engine (Less Major Assemblies)
