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GM COACH MAINTENANCE MANUAL
Sec. 13
Page 159
DRAINING CRANKCASE
The frequency with which crankcase oil must
be changed depends upon the type and quality of
oil used, the type or severity of operation, and
the condition of the engine. It is therefore im-
possible to make a general recommendation con-
cerning mileage intervals between oil changes.
The oil should be changed often enough to keep
it nonabrasive and noncorrosive.
Oil changing is
closely related to filter element and air cleaner
element cleaning and changing, the frequency of
which also depends upon the condition of operation
mentioned above.
Laboratory test of oil drained from the engine,
conducted by the oil supplier or by another suit-
able laboratory should be helpful in determining
the greatest advisable interval between oil and fil-
ter element changes for your operation. Whether
such tests are conducted or not, your oil supplier
should be able to recommend suitable oil change
periods for his oil in your operation.
CHANGING TYPE OF OIL
In some instances operators may be using
"Regular" or "Premium" engine oils instead of
the recommended "Heavy Duty" oil, or may desire
to change brands. If this is the case the following
procedure is recommended when "Heavy Duty" type
engine oil is first used.
The engine should not
be run for more than 24 hours on the new oil,
then drained and refilled. This prevents any dan-.-
gerous obstruction of oil pump intake screen or
oil strainer by any previously formed oxidation
deposits which might be loosened by purging ac-
tion of oil.
The second crankcase filling should
be drained out after running 40 hours, at which
time oil filter element should be renewed.
Fol-
lowing these two oil changes, the previously rec-
ommended or newly established oil drain periods
can be followed.
OIL FILTER
Whenever engine oil is drained the oil filter
element should be changed and filter cleaned. Fil-
ter element changing and cleaning filter should
remove all accumulations of sludge and harmful
abrasives that would otherwise contaminate the
clean oiL
LUBRICATION
OIL STRAINER
Whenever engine oil is drained the oil strainer
element and strainer should be cleaned. Wash in-
ner and outer surfaces of element and strainer in
suitable cleaning solvent. A fine bristle (not wire)
brush is satisfactory for cleaning.
DOOR HINGES
At intervals recommended on lubrication chart,
door hinges and operating mechanism should be
lubricated to permit oil reaching friction points.
FRONT AND UNDER FLOOR HEATER MOTORS
At intervals recommended on lubrication chart
apply light engine oil at heater motor oil cups.
Refer to BODY (SEC. 3 of this manual) for lo-
cation and accessibility of motors.
GENERATOR AIR CLEANER (Oil Wetted Type)
At interval recommended on lubrication chart,
or more often
if
conditions warrant, remove and
clean in cleaning solvent. Dry thoroughly.
Use
light grade oil to wet mesh element, then allow
excess oil to drain off before installing.
AIR CLEANER (BLOWER}
Keep oil level in air cleaners to "Oil Level"
mark.
At intervals recommended on lubrication
chart, or more often
if
conditions warrant, clean
and refill. Use the same grade and type of oil as
used in crankcase.
LINKAGE
At all linkage joints and clevis pins apply oil
with brush, spray, or hand oil can.
STARTING MOTOR
At intervals recommended on Lubrication Chart
apply SAE 20 engine oil at three oilers.
BRAKE SHOE ROLLER PINS
At
intervals indicated on lubrication chart,
apply engine oil sparingly to brake shoe roller
pins on both sides of rollers.
Pry shoe away
from cam to permit spinning roller to work oil
into inside of roller.
SHUTTER LINKAGE
As recommended on lubrication chart, radiator
shutter linkage should be lubricated only when
linkage is new.
,
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