The Oskaloosa herald., 1917-11-29

paA - PiOS0 VI PaPSE Eie GlodTdHCSs
Could it be a warped valve or valve
sten17 Have had new pistons and rings
put in. All the bearings seem to be a
close fit and tight. Can you give me
some information? y
1t is quite likely that the push rod
guide is badly worn, with the result
that every time the cam strikes the
lower end of the push rod the latter
Is slapped against the side of the guide.
If this Is so a new guide, and possibly
q new push rod, will be required. The
valve may be slightly warped, or the
valve stem bent, or possibly there Is
some carbon on the seat of the valve,
although If this is the case the tap
should disappear after the valves are
ground. Whether the trouble is in the
valve mechanism or not may be deter
mined by shifting the valves, push rods
and guides to one of the rear cylin-
ders. The tap might also be caused
by loose cam Shaft bearing or bent
cam shaft. }, ~. Dr.. s@
There is also the possibility that the
sound is misleading. 1t may seem to
come from the valve mechanism when
in reality 1t Is some other part. If the
trouble is still undiscovered after You
have followed suggestions given you
should inspect every detail of front of
motor carefully, paying speeial atten.
tion to the possibility of obscure trou-,
bles. The connecting rod may benbent,
the wrist pin may not be at right an
giles to the cylinder walls, the crank
shaft may be bent, the fan bracket
may be loose, and there is, host of
troubles Of similar character that vary
with each design of engine, but which
you should have no trouble In looking
for with the motor before you.
How can prevent grease from get
ting into the brake drums? My car has
full Roatins axleP and one brake drum
is always full of grease; Have had new
felts put in several times without bene-
fit. ...... ..,. -..
Possibly you are operating with too
much grease In the rear axle. Have
just enough to provide for the thor
| ough fabrication of the ring gear
that is, the gear should dip two or
, three inches into the grease. We can
offer no further help without knowing
the make and model of the car.
II dismantIe a storage battery and
leave the plates exposed to the air will
it'inJure the platea or would il be bet
ter to let them soak in soft, clear wa
ter2
One set of plates is stored dry and
the other is left IN the electrolyte. You
should not attempt to take your bat
tery apart, because skill and special
tools are required. This work is even
beyond the ordinary garage man; only
a man who has had experience in
battery service station is qualified to
dismantle battery. If you are not
going to use your battery for some
time you should place 1t In the hands
of some garage man and have him
charge it as often as required.
20 f-a = .r.. -. ..s,
Do the power strokes in a six cylin-
der motor overlap enough to keep il in
motion If the fiywheel were removed7
Yes, assuming, of course. that all CYL
inders are working properly. The pur-
pose of the fiywheel is to produce fair
ly uniform angular crank shaft veloc-
ity. If there were no flywheel, direct
ty after each explosion the crank shaft
would be speeded up considerably, and
the speed would then drop rapidly un.
TIL the next explosion occurred. A fly.
wheel reduces these variations IL
speed. When the explosion occurs the
force. acting on the piston Is spent
largely in speeding up the fywheel,
but as the latter has large mass
compared with the crank shaft the in
crease Is comparatively slight; but, on 4
the other hand, 1t drops very little in
speed as the piston progresses on it's
stroke. In other words, the fywheel
is sort of a mechanical storage bat
terry which alternately gives and re-
ceives energy.
Why would not q direct copper re-
turn from the present spark plugs give
a hotter, better spark with the same
equipment than the present eireuitous
indirect route through engine and
parts, being a better conductor and
shorter route?
There are several good reasons why
not. In the first place, the route
through the engine and frame prob
ably offers considerably less resistance
than the copper conduit, because, al
though its specific resistance Is great
er, the fact that the section of iron \
through which the current flows is \
enormously larger than the copper
greatly oyershadows the advantage
the copper has in the matter Of re-
sistance.
However, even assuming that tn,
iron offered a much greater resistance
than the copper wire. there would still
be no reason for employing copper
return, because the resistance of the
conductor is negligible alongside Of the |
resistance at the spark gap. In other
words, IL you doubled the resistance
OF both wires this would add such an J
inflnitesimaf amount to the total re-
sistance that the difference In the
spark could not be noticed.