Lift cylinder head straight up until it
clears the two dowel pins in the block;
then move cylinder head to the left to
avoid bending the fuel injection lines.
Remove the cylinder head gasket.
q. Rocker Arm Shaft Assembly Disassembly.
(1) Refer to figure 14-37. Remove plug, spring
washer, and washer from each end of the rocker arm
(2) Remove shaft locating capscrew and lock-
washer in the top of the rocker arm bracket (third
bracket from front end).
Replacement brackets will all contain
threaded hole in the top of the rocker
(3) Slide rocker arms, springs, and brackets
from the rocker arm shaft.
d. Cylinder Head Assembly Disassembly.
(1) Using a spring compressing tool, remove
spring retainer locks, and carefully release tension
on the valve spring.
Remove spring retainer and
See figure 14-38.
(2) Place valves in a rack as they are removed
from cylinder head so they can be identified and re -
installed in their original locations.
(3) The valve guides may be removed by pres-
sing them out through the top of the cylinder head.
(4) Remove valve seats by electrically welding
three small beads on inside circumference of insert
as illustrated in figure 14-39. Allow insert to cool,
then lift or pry out with a bar.
e. Camshaft, Camshaft Gear, and Valve Lifter
(1) Refer to para 14-72 and remove timing gear
(2) Refer to paras 14-18 and 14-21 and remove
the overspeed switch, adapter and tachometer drive.
(3) Before removing the camshaft from the
cylinder block, check the camshaft gear backlash.
The backlash between the mating gears of the crank-
shaft and the camshaft is 0. 0015 to O. 0009 inch. New
parts must be installed when the backlash between any
two mating gears exceeds 0.015 inch. The backlash
between hydraulic pump gear and camshaft is 0.003
to 0.011 inch.
(4) Remove capscrew and washer securing cam-
shaft gear to camshaft. (See fig. 14-35. )
(5) Before the camshaft can be withdrawn from
the cylinder block, the valve lifters must be posi-
tioned so that they do not interfere with the camshaft
(6) With the engine removed from the unit for
overhaul, simply lay the cylinder block on its side
and push the valve lifters to their uppermost position
and carefully withdraw the camshaft.
Be careful that the camshaft lobes do not
scratch or mar the camshaft bearings as
the camshaft is withdrawn from the cyl-
(7) If the engine is mounted in a unit, the valve
lifters can be held in their uppermost position in the
(a) Make up twelve pieces approximately
16 inches long of 5/8 inch wooden dowel rod and taper
one end of each slightly.
(b) Insert the tapered ends of the dowels
into the valve lifters (fig. 14-40) into the holes for the
push rods in the cylinder block and force each one
into a valve lifter.
(c) Grasp adjacent dowels for a set of ex-
haust and intake valves carefully pull the exhaust and
intake valve lifters up to their uppermost position
and place a stout rubber band around the two adjacent
dowels. Repeat for each set of valves.
(8) It maybe necessary to rotate the crankshaft
so that the connecting rods will not interfere with the
camshaft lobes during removal.
(9) After removing, the camshaft with gear
from the cylinder block, check the thrust plate clear -
ante (end play) by inserting a feeler gauge between
the thrust plate and camshaft journal. The end play
is 0.0027 to O. 0083 inch. If the end play exceeds the
maximum wear limit of O. 015 inch with a new thrust
plate, the camshaft gear must be replaced.
(10) The valve lifters may now be removed by
removing the dowels.
(11) Place the camshaft in a press and force the
camshaft from the gear.
This is necessary due to the
Change 3 14-77