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ENGINE ADDITIVES
Tool and Material Checklist:
- Dry gas
- Carburetor choke, and injector cleaner
- Gas treatment
- Oil treatment
- Penetrating oil
- Engine carbon cleaner
- Silicone fluid
- Engine sludge solvent
- Cooling system sealer
- Engine degreaser
- Belt dressing
- Starting fluid
- Diesel fuel biocide
- Fuel line antifreeze
By definition, an additive is something put in
gasoline or oil to change its structure, characteristics, or the way it performs. The additives
discussed in this booklet have one more thing in
common: They all help prolong the life of your car.
The benefits of engine additives are equally valid
whether your car is brand new or has already
topped the 100,000-mile mark; either way, they are
a vital part of vehicle longevity and performance.
An important point to keep in mind is this: Whatever engine additive you're working with, always
carefully read and follow the directions as well as
any specific cautions and warnings. And never
work on an engine that is running or still hot.
DRY GAS
Water vapor is always present in the air, and as
your car's gas tank is emptied, a mixture of air and
water vapor fills the space. In cold weather, the
water vapor condenses at the top of the tank; eventually it sinks to the bottom where it forms rust.
The rust combines with other impurities to form a
thick sludge at the bottom of the tank. Besides
working its way into the fuel tine and preventing
gas from reaching the fuel pump, sludge can also
foul the pump, the filters, and the carburetor. Dry
gas helps prevent the accumulation of water in the
tank. Because it is mainly alcohol, dry gas combines with the water and allows the mixture to flow
freely through the fuel line, where it eventually
burns along with the gas. For best results, add .11 to
the tank after filling up.
GAS TREATMENT
This product contains petroleum solvents and
alcohol, which remove dirt and dissolve gum in the
fuel system. Gas treatment is poured directly into
the fuel tank. It is a good idea to use it once or
twice a year, especially on fuel-injected engines.
Because fuel injectors are precision parts, they are
more easily affected by gum formation.
CAUTION: Make sure the gas treatment you use
Is safe for cars with catalytic converters; some
treatments are octane boosters.
OIL TREATMENT
If asked what oil does for a car's engine, most
people would answer "lubricate." Although lubrication is very important because it reduces friction
and wear between the moving parts, it is by no
means the only thing that oil does. Oil also:
• Carries heat away from critical areas and
makes parts run cooler.
• Provides a seal between the cylinder walls and
% pistons.
• Combats rust and corrosion.
• Reduces engine noise.
• Combines with the oil filter to remove contaminants from the engine.
When performing these tasks, oil is subjected to
extreme conditions. Engine temperatures can
range from below zero during winter shutdown periods to well over 400° F while in operation.
Contaminants that eat away at engine parts are constantly being introduced into the system. In
addition. oil can be thinned by gasoline and water,
and its protective additives can evaporate.
Oil treatments are used to improve oil stability
and also prolong the period between oil changes.
They replace the lost protective additives with new
additives, rust and corrosion inhibitors, and other
chemicals found in high-quality oils. Oil treatment
is poured into the engine through the oil fill hole.
On a high-mileage car, oil treatment reduces oil
loss past worn piston rings by thickening the oil. It
also helps seal the ring-to-cylinder area, thus reducing smoke and noise while increasing power. It
should be noted, however, that a thicker crankcase
oil makes it more difficult to start the engine during extremely cold weather. Because oil
treatments adhere well to metal, they are also useful for
lubricating parts before assembly when overhauling an engine.
NOTE: Oil treatments that act as oil thickeners
should be used sparingly.
ENGINE CARBON CLEANER
When carbon deposits build up inside the combustion chamber, two problems can occur. Knock,
or ping, sounds like marbles being dropped into a
metal can. It is loudest when the engine is accelerating or climbing a hill. The second problem is
after-run (or dieseling) when the engine is shut off.
Engine carbon cleaner loosens carbon from the
combustion chamber in order to reduce knock and after-run. There are two ways to use it:
1. Pour it into the gas tank.
2. With the engine running at warm idle, allow
the cleaner to dribble slowly into the carburetor or
fuel injection barrel. On engines with catalytic
converters, the air pump belt must be disconnected first.
NOTE: In late-model cars, knock and after-run
are often caused by problems in the emission, fuel,
and/or ignition systems. These systems should be
checked before engine carbon cleaner is used.
ENGINE SLUDGE SOLVENT
Among other things, sludge buildup causes the
hydraulic valve lifters to stick and malfunction.
Engine sludge solvent can be used to free the
filters.
When the hydraulic lifters are clogged, they
make a clicking sound. To determine that they are
the source of the noise, remove the rocker cover
and hold a finger on each rocker as the engine
idles. (The rockers will be covered with oil and will
probably be slippery, so use caution.) If the lifter is
malfunctioning, a distinct shock will be felt as that
valve closes. Use engine sludge solvent as follows:
1. Pour it into the engine through the oil till.
2. Do not run the engine longer than specified in
the directions on the container; this is usually less
than an hour. Repeat treatments might be needed.
3. Drain and replace the additive-laden oil, then
change the oil filter.
4. If one or more treatments of solvent fail to
free the lifters, they will have to be replaced.
ENGINE DEGREASER
Engine degreaser cleans the engine's exterior
and helps extend the life of engine wiring and
rubber parts. Apply it as follows:
1. Cover the carburetor, distributor, alternator or
generator, and any openings.
2. Spray on the degreaser.
3. Use a wire brush to loosen thick, baked-on
grime.
4. Neutralize the degreaser with water from a
garden hose.
STARTING FLUID
Starting fluid is an ether used to assist in cold
starting. It vaporizes at a temperature as low as
_600 F, thus providing a combustible fuel when even a winterized gasoline might not vaporize
sufficiently. Spray starting fluid into the air-cleaner opening just before trying to start the engine.
Starting fluid should be used only when the
weather turns unusually cold or the temperature
drops suddenly, and it should never be used on a
diesel car or on a diesel truck with glow plugs.
Your car might need a tune-up if it does not start
at temperatures typical for your area.
WARNING: Because starting fluid contains
ether, it Is very volatile and should be handled with
extreme care. Use It sparingly; If buildup occurs, a
simple spark can cause detonation. Never spray it
near an engine that is running or being started.
FUEL LINE ANTIFREEZE
Fuel line antifreeze, or methanol, prevents water
in the fuel system from freezing and stopping the
flow of fuel. Just pour it in the gas tank. Large
doses of methanol are corrosive to fuel systems,
but it causes no real problems when a small
amount is used occasionally. As an added precaution against fuel line freeze, keep the gas tank at
least half full during the winter months. This will
reduce condensation in the tank and minimize the
need for the antifreeze.
CARBURETOR, CHOKE,
AND INJECTOR CLEANER
This cleaner should be a part of a regular preventive maintenance program for your car. The
problems caused by a dirty carburetor/injectors include
hard starting, lagging acceleration, stalling, excess
emissions, and poor gas mileage. It is wise to keep
your carburetor/injectors clean for maximum engine performance.
This cleaner removes dirt from the choke, carburetor. and fuel injection linkage. It is also very
effective at freeing sticking parts, it leaves no residue that attracts and retains dirt, and it penetrates
light rust. Use it on the following:
• Inside of carburetor
• External linkage
• PCV valve
• Manifold heat control
To keep fuel injection systems clean, pour a can
of cleaner into the gas tank every few thousand
miles. It can also be used on concrete garage
floors to melt away grime and grease stains.
PENETRATING OIL
Penetrating oil frees and lubricates parts that are
stuck. it is particularly good for freeing stuck heat
control valves on exhaust manifolds: spray the
shaft joint with the oil, then work the part back and
forth. Penetrating oil is also ideal for freeing sticking clutch and transmission linkages, door and
hood hinges, and door locks (if they are not frozen). NOTE: Penetrating oil leaves a residue and
should not be used on parts to be left clean, such
as the carburetor linkage.
SILICONE FLUID
Silicone fluid can be sprayed on spark plug
wires to protect them from shorting due to moisture. Spray it more heavily on and in the spark
plug and distributor cap nipples. Repeat the application every few months.
COOLING SYSTEM SEALER
Cooling system sealer can be used to eliminate
small cooling system leaks. It is usually made from
vegetable or synthetic fibers in water. Do not use it
before the source of the leak is found. Also, whenever possible, a mechanical repair should be
made, since cooling system sealer provides only a
temporary repair. Accessible leaks for cooling system sealer include hoses, clamps, engine gasket
joints, water pump, and radiator. If the heater
leaks, try cooling system sealer first, since this can be difficult to service. Pour the sealer directly into
the radiator fill neck.
NOTE: Do not overuse this
sealer. Repeated usage may restrict the flow of water through the radiator.
BELT DRESSING
While belt dressing silences noisy belts, it does
not solve the problem that caused the belt to
squeal in the first place. Therefore, use it only as a
diagnostic aid in pinpointing the cause of a noise,
then tighten or replace the problem belt. If used
over and over on a noisy belt, it could shorten the
life of a good adjacent belt. Belt dressing is available in spray cans and tubes; with the latter, apply
a few drops on the belt and rub it in with your fingers. Never apply belt dressing when the engine is
running.
DIESEL FUEL BIOCIDE
Fungus and bacteria can invade diesel fuel and
create a substance that plugs filters, corrodes
metal components, and damages rubber and tank
coatings. Their presence on filters is evidenced by
black, brown, or green slime. Diesel fuel biocide
prevents these microorganisms from growing inside the tank or fuel lines.
If hard starting is traced to fungus or bacteria on
your fuel filter, your fuel system will have to be
professionally cleaned. Once the system is clean,
use a biocide to prevent any further occurrence of
the problem. Add it to the fuel as often as directed
on the container.
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