Volvo 960 - Manual (Page 231)

1996 Volvo 960
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.
PCV system
The orifice nipple in the intake manifold and the filter at the end of the PCV hose in the aircleaner
should be inspected every 60,000 miles (96,000 km). Check/replace rubber hoses at the same time.
pg. 8:12 Servicing
Replacing spark plugs
The spark plugs should be changed every 30,000 miles (48,000 km). However, city driving or fast
highway driving may necessitate changing after 15,000 miles (24,000 km) of driving. When installing
new plugs, be sure to fit the right type and use correct torque, see Specifications. When changing the
plugs, check that the suppressor connectors are in good condition. Cracked or damaged connectors
should be replaced. When changing the spark plugs, clean the terminals and the rubber seals.
CAUTION: Do not use silicone-based lubricants, which can have adverse effects on electrical
components.
WARNING!
The distributor ignition system operates at very high voltages. Special safety precautions must be
followed to prevent injury.
Always turn the ignition off when:
●
connecting engine test and diagnostic equipment to the vehicle (timing light, tach-dwell tester,
ignition oscilloscope, etc..).
●
Replacing distributor ignition components e.g. plugs, coil, etc..
●
Do not touch any part of the distributor ignition system while the engine is running. This may result
in unintended movements and body injury.
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