1981 Volvo DL, GL and GLT
The ignition timing should be inspected at the 600-1,200 miles (1,000-2,000 km) inspection.
All adjusting work should be done with the proper equipment. The distributor is one of the most
sensitive engine units. Careless handling can lead to decreased engine output and high fuel consumption
or even serious damage to the engine.
IV Engine Crankcase Ventilation System
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 60,000 miles. Rubber hoses
should be checked for damage at the same time. Replace if necessary.
pg. 59 Servicing
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