Beverly banner. [volume] (Beverly, N.J.) 1877-1964, 1925-04-03
NOISY VALVE is
EASY TO REMEDY
Too Much Clearance Be-
tween Litter and Push Rod
Cause of Trouble.


The commonest engine noises are
valve clicks and slaps, both of which
may be detected by the rhythmical
regularity of their occurrence. The
reason for noisy valve operation is too
great a clearance between the valve
and It's seat. In the case of overhead
valves, too great a clearance between
the litter and the push rod will cause
this trouble. The remedy is obviously
the reduction of the clearance to the
correct distance and this should be
done while the engine is heated, in
which condition the valves necessarily
operate.
Occasionally noise in the valve mech
anism is. caused by the litter being
loose In its guide. To locate this
trouble the entire litter assembly will
have to be removed. A worn litter
will have to be replaced, though in
some cases the guides may be sprung
slightly, SO that they will grip the litter
more tightly, and this eliminates the
trouble.
Replace Worn Cams.
Another possible location of noise is
lower there may be too much clear
ance. Replacing the worn parts will
usually eliminate the trouble. Worn
valve stems or guides may also cause
noise and the removal of the valve
springs will enable one to locate noise
at this point. There should be no side
play of the stem in Its guide and if this
condition Is found to exist bushings
should be fixed In the guide or new
valve with an oversize stem should be
Installed.
While the valve system is the COM
monest point of noise troubles in an
engine, IL Is not the sole location
where this trouble may arise. The
bearings in an engine are of such con-
struction as to require copious lubri-
cation, or they will burn and flatten
out, with a knock as the result. The
ordinary remedy is to take up the bear
ings by removing the shims between
the two halves or trim the metal from
the removable part of the bearing. In
doing this, care must be taken to see
that the bearing touches the shaft all
around without being too tight.
Gauginu Valve Clearance.
In making valve clearance adjust
ments, drivers are often deceived into
thinking that they have set the clear
ances at the minimum by reason of the
tappet head having a central "crater,"
which has been formed by the con-
slant hammering contact between the
tappet and the valve stem.
1t Is desirable that tappet head In
this condition should have this crater
removed by filing or grinding away
the surrounding surface. This treat
ment is advisable not only to enable
clearances to be gagged correctly, but
also for the reason that, in the
case of well-worn engine of which
the valve guides have become oval,
the valve may occasionally be held
off its seat when 1t has heightened
owing to high engine temperatures,
because 1t may then be held up through
resting on the unworn surface of the
tappet head. When this happens
usually at high engine speeds the
loss of compression occurring may not
be noticed by falling off of engine
power, but the failure of valve to
reach it's seat firmly will certainly re-
suit in the grinding-in process becom-
ing necessary earlier and more fire.
quently than should be the case.