Volvo 940 - Manual (Page 182)

1993 Volvo 940
pg. 8:7 Servicing
Valves
The valve clearance should be check and, if necessary, adjusted every 30,000 miles (48,000 km).
Air cleaner
Replace the air cleaner cartridge with a new one every 30,000 miles (48,000 km). The cartridge should
be replaced more often when driving under dirty and dusty conditions, The filter cannot be cleaned and,
therefore, should always be replaced with a new one.
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, connections on heater control
servo systems and hydraulic brake servo.
Checking and adjusting idle air control system
Your Volvo is equipped with an electronically-controlled idle air control system that requires no
checking or adjustment.
Fuel system cap, tank and lines, and connections
The effectiveness of the fuel system to contain hydrocarbons is dependent largely on a leakfree system.
Check for proper sealing of gasoline filler cap which contains "0" ring-type seals. Check all evaporative
hoses in vehicle for tightness. Check fuel lines under vehicle and repair if necessary.
Fuel (line) filter
The fuel line filter is located next to the fuel pump. This filter should be replaced every 100,000 miles
(160,000 km). The filter is replaced as one complete unit.
Replace more frequently if contaminated fuel is introduced into the tank (or if there is reason to suspect
that this has occurred).
B 230 FD only: Replacement is recommended but not required to maintain VOlvo Emission Warranty.
Timing belt
B 230 F/FT
Replace the timing belt every 50,000 miles (80,000 km).
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