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What you should know about Air-Pollution Control
*positive
crankcase
ventilation (pcv)
~
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_
fIlTDIEDA1R
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a
..
SLOWBYGASE$
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H
e
~ COMBUSTIBLE MIXTURE
OPERATION:
General Motors vehicles are equipped with
Positive
Crankcase Ventilation-a system which permits no
crankcase emission to be discharged into the ambient
air.
To
function properly,
the
system depends on the
PCV
Valve (smog valve) which recirculates and burns blow-by
gases
inside
the engine.
MAINTENANCE:
This
valve must be clean in order to
maintain
efficient
engine operation. An
operational check
of
the PCV
Valve should
be
made at
the first
oil change
(4
months or 6,000 miles, whichever
occurs
first). Every
12
months or
12,000 miles,
whichever occurs
first, the
PCVValve should
be replaced (cleaned
on Corvairengines).
Also, all hoses,
fittings
and
the inlet
air filter should be
inspected
,
cleaned and
replaced,
if
necessary.
Alwa ys
specify an AC
PCV
valve at replacement time.
NOTE:
/I
the
positive
crankcase ventilator valve should
become
clogged,
the
engine
idle
will be adversely affected.
Therefore,
if
the engine idle becomes too
slow
or
rough,
the
ventilator valve should
be
checked
before
any carbu-
retor adjustments
are made
to
compensate
for
the
trouble.
"Systems
illustrated
on V-8 engines, 6-cylinder systems similar.
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