1989 Volvo 740
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 speed
Your Volvo is equipped with an electronically-controlled idle speed 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 leak-free 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 filter is located next to the fuel pump. This filter is to be changed every 60,000 miles (96.000 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).
Timing Gear Belt
The timing gear belt should be adjusted at the 600-1200 mile (1000-2000 km) inspection for engines B230F and B230F Turbo.
For these engines, Volvo recommends the replacement of the timing gear belt every 50,000 miles (80,000 km).
For engine B234F (16 valve) the camshaft timing belt must be re-tensioned at the first 5,000 mile (8000 km) service.
For the B234F (16 valve) the recommended replacement of the timing belt is at every 50,000 miles (80,000 km) and re-tensioned at the
following 5000 mile service (example 55,000 mile (88,000 km)).
pg. 104 Servicing
Fuel system
The fuel injection system is all-electronic and is microprocessor-controlled. It can continually compensate for variations in engine load,
speed and temperature to give the best economy and power. An air mass meter, or a pressure meter on certain models measures the inducted
air. In this way the system can make instantaneous adjustments for changes in air temperature or density, thus always assuring the best
economy with the lowest possible exhaust emission.
file:///K|/ownersdocs/1989/1989_740/89740_07.htm (8 of 14)12/30/2006 8:23:38 AM
Classic Cars & Cycles www.ClassicCycles.org