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SECTION 3
Check the following when installing a new or serviced
element:
1. Back plate must be securely tightened to carburetor.
Replace back plate if bent or cracked.
2. Gasket surfaces of element must be flat against back
plate cover to seal effectively.
3. Wing nut must be finger tight
DO NOT OVER-
TIGHTEN.
The 0-200 and some C-Series engines are equipped
with a precleaner slipped over the dry element, which
traps much of the dirt and prevents it from entering the
dry element. Servicing of the precleaner is accomplish·
, ed by washing it in soap and water, rinsing, then squeez·
ing out the excess water and allowing it to dry. DO
NOT 01 L THE PRECLEANER.
0-160
A dry type element with precleaner is used on the
0·160's engine. Cleaning of the filter element, plus the
checks to make when installing a new or serviced ele-
ment, are the same as described in this section under
"C-Series and 0-200."
The precleaner is serviced as
described in the following paragraph.
To clean the precleaner, wash in water and detergent,
remove excess water by squeezing like a sponge and
allow to thoroughly dry.
Distribute three tablespoons
of SAE 30 engine oil evenly around the precleaner.
1 W.,SH
2
SQI,lEEZE DAY
3
CO"',. WITH 011 ..
Fig. 3-11 0-160 Air Cleaner
BATTERY CHECK
A hydrometer is used to measure specific gravity of the
battery. The water level in the battery should be at normal
height when a hydrometer reading is taken.
Hydrometer
readings should never be taken immediately after water has
been added. The water should be thoroughly mixed with
the electrolyte, by charging, before hydrometer values are
reliable.
3-4
FULLY CHARGED
Acid in water gives electrolyte
specific gravity of 1.260.
END/LIFE
Battery half discharged.
More acid in plates, less in
electrolyte. Starting
failure likely.
GOING DOWN
As battery discharges, acid
begins to lodge in plates.
Specific gravity drops.
DISCHARGED
Acid almost entirely in
plates, leaving weak electro·
Iyte behind. Specific gravity
lower, almost that of water.
Fig. 3-12 Battery Chemistry
In reading a hydrometer, the barrel must be held verti-
cally.
Draw just enough acid into the barrel to lift the
float. The float should not touch any part of the barrel.
High floet Ileft) means high
specific
gravity.
Low
float
means
low
specific gravity.
EYE
LEVEL
Correct method of
reading hydrometer.
Eye on lavel with
liquid surface. Dis-
regard
curvature
of
liquid
against
glass parts. Do not
tilt
hydrometer
while
reading.
Keep float vertical.
Fig. 3-13 Reading Hydrometer
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