Operation Manual

WWW.MANUALS.WS

1979 Volvo 242 244 245

that every 15,000 miles (25,000 km).

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.

The distributor advance mechanism should be checked every 30,000 miles (50,000 km).

Ignition wiring

The ignition system consists of a primary and secondary system. The secondary system contains the

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.

Distributor cap and rotor

Check the distributor cap and rotor for wear cracks, carbon formation, dirt and corrosion.

Vacuum advance delay valve

This valve should be replaced every 30,000 miles (50,000 km). A clogged valve will impair fuel

economy.

(Not used on all models.)

IV Engine Crankcase Ventilation System

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

file:///K|/ownersdocs/1979/1979_242_244_245/79242244245_03a.htm (15 of 18)12/22/2006 10:24:28 PM