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emissions, but will improve performance and
economy.
• Engine Tune-Up and Electrical Checks-Fuel
and electrical systems are subject to wear and
contamination and require periodic cleaning and
adjustments to maintain maximum economy and
performance. These same factors which have an
important effect in the control of air pollution are
included in engine tune-ups which are recom-
mended at one year or 12,000 mile intervals.
• Positive Crankcase Ventilation Valve Replace-
ment-Crankcase vapors and other impurities can
cause malfunction of the crankcase ventilation
PCV valve resulting in an increase of crankcase
emissions and cause improper engine idle condi-
tions. Regular replacement of the PCV valve is
recommended at 12-month or 12,000-mile
intervals.
Always specify an AC PCV valve at replacement
time.
• Belt Adjustments-To assure proper perform-
ance of belt-driven engine components, all belts
should be checked and adjusted periodically.
• Carbon Deposits-A degree of carbon buildup
is normal in the combustion chambers of any
gasoline engine, depending upon oil and fuel
quality and operating conditions. For best results,
follow the fuel and oil recommendations in this
manual.
• 38 •
• Air Conditioner-Annual maintenance is neces-
sary to assure proper
performance.
Adding of re-
frigerant may be necessary from time to time.
• Paint, Chrome and Trim-are affected by
normal wear and exposure. Proper maintenance
and care of these items can add to their appear-
ance and durability.
B. REPLACEMENT ITEMS
• Brake Linings-are directly affeCted by driving
habits and use; the replacement of brake linings
and the reconditioning of brake drums should be
performed when necessary.
• Spark Plugs and Ignition Points-are subject
to wear and/or contamination. They should be
inspected periodically and replaced if necessary
for maximum engine performance and economy.
For maximum performance and economy for
your vehicle replace with General Motors parts
which are identified by
one of these trademarks.
•
Filters-perform the important function of
cleaning air, fuel or oil and should be serviced at
recommended intervals.
• Wiper Blades-life is dependent upon use and
climatic conditions and they should be replaced
when necessary.
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