Volvo 240 1991 Owner's Manual page 113

Volvo 1991 240 Model
pg. 76 Service requirements
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 (48,000 km).
Exhaust Gas Recirculation (EGR)
This system operates by returning some of the exhaust gases to the engine to be recombusted: since this
lowers the combustion temperature the amount of nitrogen oxides released into the atmosphere is
reduced.
The EGR valve should be cleaned at the 60,000 mile (96,000 km) inspection and thereafter cleaned
every 20,000 miles (32,000 km).
Timing belt
The timing belt tensioner should be adjusted at the 600-1,200 mile (1,000-2,000 km) inspection.
pg. 77 Servicing
Engine Fuel System
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