Positive Crankcase Ventilation (Pcv) - Chevrolet 1971 Camaro Owner's Manual

POSITIVE CRANKCASE
VENTILATION (PCV)
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BLOW BY GASES
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VALVE
OPERATION: All General Motors gasoline engine
powered vehicles are equipped with Positive Crank-
case Ventilation-a system which permits no crank-
case emissions to be discharged into the atmosphere.
To function properly, the system depends on the
43
PCV Valve which returns blow-by gases to the com-
bustion chamber where they are burned.
MAINTENANCE: This valve must be clean in
order to maintain efficient engine operation. An
inspection of the ventilation filter should be
made at the first oil change (4 months or 6,000
miles, whichever occurs first). At each subse-
quent oil change, the ventilation filter should
be inspected and replaced if necessary. Re-
place filter at least every 24,000 miles. Under
normal driving conditions, the PCV Valve should
be replaced every 24 months or 24,000 miles,
whichever occurs first, and all hoses and fit·
tings should be inspected and cleaned or re-
placed, as necessary. Replace the PCV Valve
and inspect related parts every 12 months or
12,000 miles when the vehicle is used in a ser-
vice requiring more frequent engine oil change
as covered on page 53.
NOTE: Emission control systems in this section are Illustrated
on V-8 engines; systems on 4 and 6 cylinder engines are similar.