The Washington herald., 1921-11-13

cant in the differential housing does
not silence the noisy action, the
gears should be inspected to see
that the teeth are not worn too
Huch and that they are meshed
properly. IL there is too much play
between the gears, there Is apt to
oe knock or rattle in the rear
axe rather. than a grinding noise.
case the teeth have become
cnlpped' the projections should be
smootned with fine file. IL con-
siderable looseness exists between
the gear teeth, an effort sbonId he
made to eliminate ALI lost notion
The entire differentiaI assembly
should never be moved nearer 10
the bevel pinion, which can be
easily done in most forms of float
ing aXles, or by meshing the ninion
more deeply in the ring gear.
Cap for OIL Cup.
| Fhe caps for the small oil Guns
ABOUT a car have a habit of break
ing loose and mysteriousIy disap-
bearing. As result, dirt and grit
IoISe thelr way into the bearing
win the OIL Where such a cap has
oeen iost' the trouble may be easily
I u. a
rs sllpped through a fiat washer and
the prongs are bent so as to snring
fagalnst the inside of the oil cup.
knocks.
Mechanically. they are due TO
| locseness in some external part.
! which may generally be detected by
la careful inspection while the
motor is running. Looseness in the
crankshaft and both the upper and
lower connecting rod bearings are
common causes of knocks. only a
very small amount of play should be
ailoWed In these parts. A loose
piston and badly worn or broken
piston rings also contribute their
share. Looseness in the -hy-wheeI
bearing, timing gears and loose
couplings are also causes OF knocks
In the valve mechanism. looseness
IN the parts, such as worn valve
stem guides and play in the push
rod guides, manifest themselves as
/ a click. A mechanical knock or
other abnormal sound represents
wear or the result of wear, and IL
| IS advisable to remedy such condi-
tons as soon as possible before
other complications develop.
The combustion knocks may be
due to carbon deposits, spark ad-
vanced too far when ascending a
hill. and sometimes a slightly weak
mixture.
Magnetic Care.
| The magnetic requires very little
care. 1t should be kept free from
oil, dust and water and 1t should be
properly fabricated. A few drops of
thin oil should be dropped into the
bearings about every 5000 miles.
All water, dust or oil should be
wiped away from the exterior of
the housing so that there may be
no danger Of their seeping through
to the delicate parts. The distribu-
tor and timing contact points should
be occasionally cleaned. When set
ting the gap of the contact points,
always use the gap clearance
recommended by the makers of the
magnetic. II there should be ex-
cessive arcing at the contact points.
IL indicates a loose condenser con-
nection or a defective condenser it,
self.
lyediment In Gasoline.
Sediment in gasoline does not pass
into the cylinders with the gasoline
vapor, but generally collects at the
bottom of the tank or the carbu-
rotor. 1t is advisable to occasional
/ ly drain the sediment bulb of the
gasoline tank and the carburetor
so as to clean away any sediment
which may have collected. II this
is not done, clogging OF the feed
limo or carburetor may result.
Testing Spark Plugs.
When a spark plug is missing"
the usual method of determining
which one Is at fault is to short
circuit each plug separately with
screw driver. Tho plug which
fails to slow down the engine when
"shorted" is the guilty one. Most
every driver knows this. Most driv-
ers- also think that a wooden or
fibre-handled screwdriver must be
used in order to avoid a shock. Yet
how many drivers have been sur
prised at receiving a shock in spite
/ of the insulated handle, due, per-
haps, to moisture or other conduct
ing material on the handle or be.
cause of their hands accidentally
coming in contact with the metal