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LUBRICATION
STANDARD VENTILATION SYSTEM
The ventilation system should be inspected and
serviced at least every
six months and the ventilator
valve replaced every year, preferably to coincide with
the annual engine performance evaluation. The car-
buretor air cleaner element should be replaced every
two years.
This service will be required more frequently if the
vehicle is used extensively for short-trip driving less
than 10 miles with frequent idling, such as in city
traffic.
S ERVlC E PROCEDURES
With the engine idling, remove the ventilator valve
and cap assembly from the rocker cover (Fig.
27).
If the valve is working freely, a hissing noise will
usually be heard as air passes through the valve, and
a strong vacuum should be felt when a finger is placed
over the valve inlet.
If the valve is working properly, reinstall the ven-
tilator valve and cap assembly and remove the oil
filler pipe breather cap. With the engine still idling,
loosely hold a piece of stiff paper or a parts tag over
the oil filter pipe. After allowing few seconds for
crankcase pressure to reduce, the paper should be
drawn against the filler pipe with a noticeable force.
If this occurs, a final check should be made to be cer-
tain the valve shuttle is free. Shut off the engine, re-
move the valve and shake it vigorously. A clicking
noise should be heard if the valve shuttle is free. If
the noise is heard, the valve is satisfactory and no
further service is necessary.
If the valve does not click when shaken, or the pa-
per is not drawn against the filler pipe with a notice-
able force, replace the valve and recheck the system.
NOTE: Do not attempt to clean the valve. Replace
it with a new valve.
On
170
cubic inch engines use Ventilator Valve
identified by either a number
"6"
stamped on the
end, a step on the end face, or a white end washer.
For all other engines use valves that have either the
letter
"H"
stamped on the end, a flat end, or a black
end washer.
Remove the ventilator valve hoses (Fig.
27),
from
the valve cap, inspect it and clean, if necessary.
Remove the breather cap (Figs.
28
and
29)
and wash
it in kerosene or other suitable solvent to remove all
Fig. 28-Oil
Filler Breather C a p 4 - C y l .
old oil and dirt. Lubricate the filter element with SAE
30 engine oil.
Remove the carburetor. Hand turn a v4 inch drill
through the passages to dislodge solid particles. Blow
passages clean.
CAUTION: Under no circumstances should metal
be removed. Use a smaller drill, if necessary.
Clean the air cleaner element as outlined on page
15.
CLOSED VENTILATION SYSTEM
Periodic service of the fully closed crankcase venti-
lation system (Fig. 30) is required to maintain good
engine performance and durability as deposits of
combustion products will accumulate in the valve,
hose and carburetor passages.
EXTHER
CAP"
c
1
KR
132A
'
* . !
. - -A
Fig. 29-Oil
Filler Breather Cap--O-Cyl.
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