Grant County herald. [volume] (Lancaster, Wis.) 1850-1968, 1924-12-24
DO YOUR MOTOR
VALVES LEAK?
A Host of Auto Ailments
Are Directly Traceable
to Leaky Valves.
PERTINENT VALVE FACTS
Refacing and Reseating Valves is a
Most Important Operation.
[Bv Service Garage. Potosi. WIS

(By Service Garage, Potosi, Wis.,
When a man has a leaky heart
valve, his doctor says: You'll have
to quit work, refrain from violent ex-
ercise, and take life easy if you want
to live" In other words, the patient
is "all in" Unlike gas motor, heart
valves cannot be taken out and re-
faced.
The motor is the heart of the auto,
and it's valves are the seat of most of
its ailments. When the valves are in
prime condition, the motor runs along
smooth, rhythmic purr, that is a joy to
the driver. But. let the motor develop
heart leak and trouble begins. The
valves are not functioning properly
the car goes by fits and starts-lacks
power-reQuireS richer mixture
pumps oil, which fouls the spark
plugs GOTTEN diagnosed as piston ring
or carburetor trouble)-and wastes
gasoline. The motor is sick-has no
pep-is all run down, because of
leaky valves.
The unequal cylinder compression
makes the motor run unevenly; and
it's ierky operation is transmitted
through all the working parts-back
rear wheel tires Then the car owner
curses the car, and it's maker, and the
dealer who sold it to him, because he
rarely understands the Importance OF
gas-tight, compression-tight valves.
He doesn't know that poppy motor
performance is more dependent upon
perfectly seating valves than any
thing else.
Many motor troubles attributed to
fouled plugs, worn piston rings, faulty
carburetion, defective ignition, and q
host of other faults, can be traced d.
rectly to worn, warped or leaky
valves. All automotive motors are a.
cycle
Cycle 1, intake or suction stroke.
Cycle 2, compression stroke.
Cycle 8, explosion or power stroke;
Cycle 4, exhaust or scavenging
stroke
Possibly that is nothing new to you,
but many do net know it. Now heres
what happens when the valves are
worn, warped, pitted, and leaky.
On the explosion stroke Cycle 81,
part of the explosions power passes
the leaky valves into both the intake |
and exhaust manifolds. The unburned |
gas that leaks into the intake mani |
fold tends to weaken the mixture for |
the next explosion. The gas that leaks |
past the exhaust valves means power
and gasoline wasted, and causes
valves to become burned, pitted, ana |
warped.
On the suction or intake stroke |
(Cycle ~, burned gases from the eX-
haust manifold are drawn back INTO
the cylinder in sufficient amounts TO
change the mixture in some cylinders, |
to an extent that makes proper car
bu.etor adjustment for all cylinders
-
On the compression stroke (CycIe y
part of the gas mixture leaks past
the exhaust valve and is wasted. How
ever. the largest waste occurs from
the gas that is actually left unburred |
within the cylinder, due to the low |
compression and proportionately weak |
explosion resulting from a weakened
compression.
And that is not all. Leaky valves
because they do not hold the compress
sion, permit oil to come up past the
pistons and foul the spark plugs. |
When the valves are properly seat
ing. the compression is held and the
little oil that passes the piston is
burned before it fouls the spark plug,
or is forced out past the valves. Again,
when valves are gas-tight both the
compression and explosion force the
oil down past the piston rings.
Wasteful processes are in constant
operation in motors with leaky valves,
causing motors to perform most I'M
satisfactorily to car owners. Symptoms |
of this condition are particularly no.
ticeable when motors are running at
low speed or on hard pull. Proper
ly faced, centered, and seated valves |
will add more pep and power to a
sick motor and will improve motor |
performance more than any other one
operation that can be done for it.-Adv
I cnl,1- nd 1.rifn Of |