Valve Lash Adjustment - Ford F100 1959 Shop Manual

PART 1-3 - MEDIUM AND HEAVY DUTY V-8 ENGINES 1-55
T
001-T521
-61 J5-CJD
STEP 1 _ SET NO. 1 PISTON ON T.D.C. AT ENO O F COMPRESSION
snOKE_ADJUST NO.
I. .,
5 EXHAUST
&
NO. 1, 2, 1 INTAKE
FIG.
32-Sending Unit Adapter Installation
STEP 2 - ADJUST NO. 6
&
8
&
S ''''TAKE
STEP 3 - ADJUST NO. 2, J , 7 EXHAUST & NO.3, 6, 8 INTAKE
1022_8
FIG.
33-Preli minClry Valve Lash Adiustment-
Typical
contact with the seats long enough to
cool properly.
If
the lash is excessive,
it
will cause the valve 10 open too
late and close too early causing valve
bounce. In addition, da mage to the
camshaft lobe is likely because the
tappet foot will not follow the pat-
tern of the camshaft lobe causi ng a
shock contact between these two
parts.
If the cylinder head or the valve
roc ker arm shaft assembly has been
removed and installed, it will be nec-
essary to make a preliminary (cold)
valve lash adjustment before starting
the engine. If the adjuslmeO! is made
fo r an engi ne tune-up, follow the
final adjustment procedure.
FIG. 34-valve
La sh Adjustm e nt-Typical
The cylinders are numbered from
front to rear-right bank, 1-2-3-4; left
bank, 5-6-7-8. The valves are ar-
ranged from front to rear on both
banks, E-1-I-E-E- I-I-E.
The sending unit adapter is installed
as shown in Fig. 32. C lean the ada p·
ter recess thoroughly. Coat the adup--
lef with wate r resistant sealer a nd
ila ll
it w
ith the undercut toward
.e inside of the cylinder head. Drive
the adapter in until it is flush with the
casting surface.
VALVE LASH ADJUSTMENT
It is very imporlant thai the valve
lash be held as close as possible to
the correct specifications.
If
the lash
is set too close, the valve will open
too earl y and close too late, resulling
in rough engine idle. Burning and
warpi ng of the valves will occur also
because the valves cannot make firm
PRELIMINARY ADJUSTMENT
I. T urn all the adjusting screws
until interference is noted, between
the screw and the rocker arm, then
check the torque required to turn
the screw furt her.
If
the torque re-
qui red to turn the screw is less than
3 fOO l-pounds (36 inch-pounds), try
a new self locking adjusting screw. If
this is stilt unsat isfactory, replace the
rocker arm and adjusting screw.