REPAIR MAINTENANCE OPERATION OF MOTOR VEHICLES
Mazda 3 (2003 release)

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Mazda
	3
		Operation and maintenance of car
		Engine
			General description new engines models L8, LF, L3
				The mechanical part of engines
				Variable valve timing mechanism
					Variable valve timing
					The design of the variable valve timing mechanism
					Main features of the mechanism of variable valve timing
					The design of the variable valve timing mechanism
					The oil control valve (OCV)
				Lubrication system
				Cooling system
				Fuel system
				Exhaust and Emission
				Electric motors
			The mechanical part of engines
			Appendix 1
			Annex 2
			Appendix 3
			Engine Z6 - mechanical part
			Lubrication system
			Cooling system
			Intake system
			Fuel system
			Exhaust and Emission
			Ignition system
			Control system
			Tables
		Transmission
		Chassis
		Steering Gear
		Brakes
		Onboard electric
		Body

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Variable valve timing mechanism

Variable valve timing

The design of the variable valve timing mechanism

Main features of the mechanism of variable valve timing

The design of the variable valve timing mechanism

The oil control valve (OCV)

Fig. 2.29. Chart valve timing mechanism: 1 - torque; 2 - the motor speed; 3 - small and medium speed engines; 4 - high-speed engines; 5 - engine with variable valve timing mechanism

The mechanism of the variable valve timing allows optimum moment of opening and closing valves according to the operating conditions of the engine by continuously changing the camshaft drive of the intake valves and the crankshaft (Fig. 2.29).

Diagram of variable valve timing for different ranges of engine

Fig. 2.30. Diagram of variable valve timing for various engine operation ranges: 1 - load; 2 - the engine speed; 3 - range of idling; 4 - range of small loads; 5 - range medium loads; 6 - range of large loads of small and medium speeds; 7 - a range of large loads and high speeds; 8 - unit at full load

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