inch above the pan surface contact.
If they do, remove and reinstall.
Caution: Make sure that rear face
of bearing cap is flush with rear face
of cylinder block.
(7) After the filler block is in place, start
the bearing capscrews, drive in the
two dowel pins half way, and torque
the screws to 140-150 foot-pounds.
Then drive in the two dowels until
they are flush.
a. Removal and Disassembly. Remove the
rocker arm and disassemble the camshaft parts
of the engine as shown in figure 66.
(1) Remove rocker arm shaft assembly
(7) and push rods (14) (see figs. 51
and 52). Remove the valve spring re-
Figure 68. Valve guide location.
tainer locks (18, fig. 66), retainers
(19) and springs (20).
b. Cleaning, Inspection, and Repair. Clean
(2) Remove the valves (24) in order and
all metal parts in an approved cleaning solvent
place them in a rack with holes num-
and dry thoroughly. Wipe nonmetal parts with
bered for both intake and exhaust so
clean, dry cloth.
they will not be mixed in handling.
(1) Place valve spring retainer locks (18),
(3) Remove all valve guides (22) by press-
retainers (19), and springs (20) in a
ing them out from the combustion
container of solvent.
chamber side.
(2) Clean the valve stem guides (22),
(4) Using a puller, remove the cam and
removing lacquer or other deposits by
crank gears (fig. 67).
running a wire brush (or a valve guide
(5) Remove the screws holding the cam-
cleaner) through the guides. Check
shaft thrust plate (32, fig. 66) to the
guides for wear, replacing all guides
block, which will permit pulling the
that are bell-mouthed. Also replace
camshaft forward out of the bear-
any guide that has increased .0015 or
ings.
more in diameter. Valve guides can
Note. Before pulling the camshaft com-
be located by means of figure 68.
pletely, check the clearance of the camshaft
(3) Inspect exhaust valve seat inserts
journal in the bearing hole or bushing (para
(23, fig. 66) and replace any that are
loose, cracked, or otherwise damaged.
(4) Inspect valves for condition and re-
place any that are "necked", cracked,
burned, bent, or worn beyond the
limits given in paragraph 94.
(5) Check all valve springs with a spring
tester. Refer to paragraph 94.
(6) Inspect the rocker arm shaft (7) for
wear. If the shaft has acquired
shoulders, replace it. Blow out oil
holes with air. Examine rocker arms
(10) for cracks, worn bushings, and
condition of valve contact surface.
Replace all defective arms or any
Figure 67. Crankshaft gear removal.
AGO 8166A
