Cylinder head

The alternator, coolant pump and compressor air conditioning systems are linked together through a Poly-V belt (Fig. 2.16). Poly-V belt guide rollers, which rejects it and sends it to the contact pressure on the tensioner. The tension is continuously passed through the Poly-V belt tensioner. The action of the spring tensioner provides compensation of linear expansion and fluctuations Poly-V belt when the engine.

Redesign of the cylinder head gasoline engine Z 18 XER DOHC-I allowed to improve the circulation of coolant in the cylinder head, resulting in increased heat dissipation. Exhaust ports in the cylinder head redesigned so that the air flow at the inlet, which sglazhivaets in a plastic module, intake, could be fed to the intake valve without turbulence. Gasoline engine Z 18 XER is rotating stars camshaft and a camshaft drive on the intake valves and camshaft drive on the exhaust valves. Continuous adjustment of the camshaft sprockets carried by the pressure of engine oil. Two solenoid valves regulate the oil pressure in the controlled camshaft sprocket in accordance with commands from the engine control module. Valve drive is equipped with a piston pushers. As in the petrol engine Z 16 XEP DOHC, valve clearance by altering the valve tappets appropriate size. In the petrol engine Z 18 XER DOHC-I used conical valve springs. Because of the conical valve springs back pressure increases during compression of plunger. This allows the valve after passing the bottom dead point cam cam, immediately shut down again under the influence of inertia of conventional springs. Application of new technology for continuous adjustment of camshaft allowed to build a channel for oil supply in the cylinder head. Oil leak svyazzan a supply line of crankshaft bearings.

Fig. 2.17. The head of the cylinder

- petrol engine Z 18 XER DOHC-I: 1 camshaft drive intake valves, 2 camshaft drive of the exhaust valves, 3 - Leading gear camshaft drive intake valves, 4 - Leading gear camshaft drive of the exhaust valves, 5 - inlet channels

Block front bearing camshaft was redesigned and includes two control valves for camshaft drive the intake and exhaust valves. Block bearing camshaft is equipped with a special channel through which oil under pressure coming from the engine lubrication system. The head of the cylinder block has a separate oil line connected to a supply oil channel crankshaft bearings.

Fig. 2.18. The head of the cylinder

block by block poshipnika bridge cam: 1 - block the bridge bearing camshaft, 2 - position and connection of the sensor camshaft drive intake valves, 3 - position and connection of the sensor camshaft drive of the exhaust valves, 4 - valve adjust camshaft drive of the exhaust valves, 5 -- camshaft drive of the exhaust valves, 6 - oil slide in the cylinder head; 7 - cylinder head, 8 - camshaft drive intake valves, 9 regulating valve camshaft drive the intake valves

Features

The head of the cylinder block has re-designed inlet channels. Improved return system of motor oil and heat. The revised cam profile and the mechanical plunger. Established conical valve springs and re-designed blocks camshaft bearings. In addition, the increased rigidity of the block.