The Brookings register. [volume] (Brookings, Brookings County, S.D.) 1903-1971, 1916-08-10

buuueuiy dctS AS II tue brakes nave
been put on, due to the fact that the
motor misses fire or explodes ~unevenly
and has to work against the compress
sion Of the dead cylinders, 1t is an en-
tirely different feeling from that due
to first weak and then strong explo-
sion. Sometimes a slipping clutch will
cause an uneven sensation.
1t Is possible that the commutator is
dirty or that the valves are in such
condition that they seat tightly enough
for higher speeds, but at low speed per-
NIT a leakage of gas, and hence they
miss. Some Of the units or contact
points on the coil vibrators might be
badly worn or dirty and need cleaning
and adjustment. Sometimes the mis-
adjustment in these coils is just
enough to be noticed at certain speeds.
At other times a short circuit In the
ignition may give an irregular action.
and this can be detected by the buzz
ing Of the coil unit continuously in
stead Of internationally. Some of the
reasons generally given for the engine
running irregularly at low speeds are
the following:
Close gap between spark plug points.
Too great clearance between valve
stem and push rod.
Weak exhaust valve spring.
Air leak in intake manifold.
Coil vibrator improperly adjusted.
Spark plugs dirty.
Poor compression on account of leaky
valves.
Gas mixture too rich or too lean.
Will q gasoline motor Of either four
or six cylinders come to a standstiiI
with any of its pistons in the top dead
center?
If the compression in all of the cyl
inders is good and the bearings free
the pistons will not stop at dead cen
ter. The compression resistance will
prevent this.
What is considered q reasonable con-
sumption by a four cylinder motor
3Ts by Ne of light, medium and heavy
oils? How 10 the oil consumed and the
different ways it can be wasted or lost?
Three hundred miles per gallon would
be reasonable; 600 would be good.
Oil Is consumed merely through burn
ing in the combustion space. Every
time the piston goes down 1t leaves the
cylinder walls wet with oil, and this
oil is burned off. This action occurs
even when NO smoke is emitted. Oil
usually wear out by continual pas
sage through bearings and becomes
dirty. 1t a be restored by boiling.
screening. etc., but the trouble is more
than the oil is worth.
The high and intermediate gear
shifting fork o. my car wears out very
quickly. ! have had to put in three in
1900 miles. Tho machine has been
kept we'll oiled. The gears do not
cause any trouble when shifting. What
10 the matter7
The cause Of the shifter forks wear
ing is that the control lever binds in
its socket. This is caused either by
lack Of fabrication or by having the
control lever dust cap which fits over
the ball socket drawn up too tightly
against the side.
Can you give me a formula for a CO.
ment for pipe connections and spark
plugs that will withstand heat and
compression and will dry without heat
ing7
Ordinary brown shellac and graphite
is good. Mix to a paste and apply
when connection is made.
There 10 a light tap in my motor which
10 very noticeable at all engine speeds,
both when running under load and
when idling. IL sounds like a too far
advanced spark, but this is not the
cause Neither 10 it caused by the pis-
ton striking the cylinder head gasket.
The tap 10 regular and occurs in one
cylinder. II 10 not caused by carbon
or connecting rod trouble. Can you tell
me the cause?
From he data you give it would
seem that you are referring to a valve
tap which possibly results from worn
push rods or valve stems, in which
SoSC IhC puICS SuOuIu Dc TepldCeu anu
fitted with the proper gap Of not more
than n thirty-second inch and not
less than n sixty-fourth inch be-
tween the parts. When the gap is too
wide between the push rods and valve
stems noise will result. Knocks which
become audible with advanced spark
usually originate somewhere in the pis-
ton assembly and are probably due to
loose pistOns. worn piston pin bush
ings or to the condition Of the bearing
vt the connecting rod end. The con-
hecting rod itself may be out of align
ment or bent.
What 10 the best way Of finding q
nissins cylinder In an eight or twelve
cylinder motorf
The best method IL by short circuit
Ing the plugs In each Of the cylinders
individually while !. . motor IL running
slowly. When a difference Ii detected
~ soon ~ the plug u short circuited II
ID evident that the motor was previous