Specifications

PART 1-1 -GENERAL ENGINE SERVICE
1-13
Model TV-2
Runout Gauge
Tool-67
A10M-A
FIG. 17-Valve Face Runout
Inspect the valve face and the
edge of the valve head for pits,
grooves, scores, or other defects.
Inspect the stem for a bent condi-
tion and the end of the stem for
grooves or scores. Check the valve
head for signs of burning or ero-
sion, warpage, and cracking.
Inspect the valve springs, valve
spring retainers, locks, and sleeves
for defects.
Valve Face Runout. Check the
valve face runout (Fig. 17). It should
not exceed the wear limit.
Valve Stem Clearance. Check the
valve stem to valve guide clearance
of each valve in its respective valve
guide with the tool shown in Fig. 18
or its equivalent. Use a flat-end indi-
cator point.
Valve Spring Pressure. Check the
spring for proper pressure (Fig. 19).
Do not remove the damper spring
if one is installed when checking the
pressure. Weak valve springs cause
poor engine performance.
A VS B = VERTICAL TAPER
C VS D = HORIZONTAL TAPER
A VS C AND BVSD z OUT-OF-ROUND
CHECK FOR OUT-OF-ROUND AT
EACH END OF JOURNAL
LENGTH SCALE
liiliPi
A1013-B
FIG. 19—Valve Spring Pressure
Valve Spring Squareness. Check
each spring for squareness, using a
steel square and a surface plate (Fig.
20). Stand the spring and square on
end on the surface plate. Slide the
spring up to the square. Revolve the
spring slowly and observe the space
between the top coil of the spring
and the square. The out-of-square
limit is YIQ inch.
REPAIRS
Valve defects, such as minor pits,
grooves, etc. may be removed. Dis-
card valves that are severely dam-
aged, or if the face runout or stem
clearance exceed specifications.
Discard any defective part of the
valve assembly.
Refacing Valves. The valve refac-
ing operation should be closely co-
ordinated with the valve seat refac-
ing operation so that the finished
angle of the valve face will match the
valve seat. This is important so that
the valve and seat will have a good
compression tight fit. Be sure that
the refacer grinding wheels are prop-
erly dressed.
NOT MORE
THAN 1/16*
A1199-A
FIG. 18—Valve Stem Clearance
A1014-A
FIG. 20—Valve Spring Squareness
FIG. 21—Crankshaft Journal
Measurements
If the valve face runout is exces-
sive and/or to remove pits and
grooves, reface the valves to a true
44° angle. Remove only enough stock
to correct the runout or to clean up
the pits and grooves. If the edge of
the valve head is less than %2 inch
after grinding, replace the valve as
the valve will run too hot in the
engine.
On engines with hydraulic valve
lifters, if the valve and/or valve
seat has been refaced, it will be
necessary to check the clearance be-
tween the rocker arm pad and the
valve stem with the valve train as-
sembly installed in the engine.
Select Fitting Valves. If the valve
stem to valve guide clearance ex-
ceeds the wear limit, ream the valve
guide for the next oversize valve
stem. Valves with oversize stem
diameters of 0.003, 0.015, and 0.030
inch are available for service. Refer
to "Reaming Valve Guides."
HYDRAULIC VALVE LIFTERS
The lifter assemblies should be
kept in proper sequence so that they
can be installed in their original
position. Inspect and test each lifter
separately so as not to intermix the
internal parts. If any part of the
lifter assembly needs replacing, re-
place the entire assembly.
CLEANING AND INSPECTION
Thoroughly clean all the parts in
clean solvent and wipe them with a
clean, lint-free cloth.
Inspect the parts and discard the
entire lifter assembly if any part
shows signs of pitting, scoring, gall-
ing, or evidence of non-rotation.
Replace the entire assembly if the
plunger is not free in the body. The
plunger should drop to the bottom
of the body by its own weight.