Operation Manual

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1979 Volvo 242 244 245

Drive belts

The belt tension can be checked by depressing the fan belt at a point midway between the alternator and

fan. It should be possible to press down the belt about 1/4" - 3/8" (5-10 mm). This also applies to other

drive belts on the engine.

pg. 50 Emission control system

I Engine Mechanical Components

Torque manifold nuts

The manifold nuts should be torqued at the 600-1,200 mile (1,000-2,000 km) inspection. A loose

manifold could alter air/fuel ratio and cause an increase in emission and/or poor driveability.

Valves

The valve clearance should be checked every 30,000 miles (50,000 km).

Vacuum fittings, hoses and connections

Unstable idle, misfiring or poor emission control is often caused by leaking vacuum hoses or

connections. Check hoses and connections on distributor vacuum unit, EGR valve (where applicable)

and connections on heater control servo systems and hydraulic brake servo.

Camshaft drive belt

The camshaft drive belt tensioner should be adjusted every 15,000 miles (25,000 km).

Replace the drive belt every 45,000 miles (75,000 km)

An incorrectly tensioned drive belt will impair exhaust emission as the valves will open and close

incorrectly.

II Engine Fuel System

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