Specifications

1979 Volvo 264 265
high tension leads connecting the distributor cap with the spark plugs and the coil.
These wires should be inspected at each engine tune-up, and should be replaced if cracked, frayed or
damaged from abrasion. It is important to clean all parts of this secondary system thoroughly because
dirt greatly reduces the available voltage to the spark plugs.
IV Engine Crankcase Ventilation System
1 Calibrated valve
2 Flame guard
Crankcase ventilation
The engine is provided with positive crankcase ventilation which prevents crankcase gases from being
released into the atmosphere.
Instead, the crankcase gases are admitted to the intake manifold and cylinders.
Cleaning PCV valve
The calibrated positive crankcase ventilation valve should be cleaned every 15,000 miles (25,000 km).
Rubber hoses should be checked for damage at the same time. Replace if necessary.
pg. 54 Emission control system
V Engine External Exhaust Emissions
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