Related Manuals for Volkswagen 4.2l V8 5V
Summary of Contents for Volkswagen 4.2l V8 5V
- Page 1 Service Training Self-study programme 341 The 4.2l V8 5V engine Design and function...
- Page 2 The 4.2l V8 5V engine will be launched in two Besides their differences in output, the two engines variants: will differ primarily as a result of the modifications necessary for the Touareg's off-road capability. - In the Touareg, with an output of 228kW...
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Page 3: Table Of Contents
At a glance Introduction ...........4 Technical features . -
Page 4: Introduction
Introduction Technical features Development of the two V8 engines focussed primarily on the following development objectives: - Compliance with future emission regulations - Reducing fuel consumption - Increasing torque and output - Reducing the weight of the engine - Improving operating comfort - Off-road capability in the case of the Touareg S341_011 Engine mechanical system... -
Page 5: Technical Data
Technical data Engine code AXQ (Touareg) BGH (Phaeton) Design type 8-cylinder V engine with a 90° V angle Displacement [cm 4172 Bore [mm] 84.5 Stroke [mm] Valves per cylinder Compression ratio 11:1 Maximum output 228kW at 246kW at 6200 rpm 6500 rpm Maximum torque 410Nm at... -
Page 6: Engine Mechanical System
Engine mechanical system Ancillary unit drive The ancillary units are driven by means of a 7-groove poly-V belt. The ancillary unit drive fitted in the Phaeton differs from that in the Touareg due to an additional guide roller and the different layout of certain ancillary units. Touareg In the Touareg, the alternator and air conditioning compressor are installed in a higher location than in the Phaeton. -
Page 7: Toothed Belt Drive
Toothed belt drive Both exhaust camshafts and the coolant pump are driven by the crankshaft in the toothed belt drive. The toothed belt is tensioned via a belt tensioner and a hydraulic tensioning element. Locating plates with bores S341_091a S341_091b S341_090 Exhaust camshaft sprocket Exhaust camshaft sprocket... -
Page 8: Intake System
Engine mechanical system Intake system The fresh air intake system has a twin-branch design to reduce pressure losses. Both intake tracts are brought together at the intake manifold upstream of the throttle valve module. A hot film air mass meter per intake tract and an intake air temperature sender in the air mass meter G70 are used to determine the intaken quantity of fresh air. - Page 9 Variable intake manifold Variable intake manifold change-over valve N156 The figure shows the two-stage variable intake manifold fitted in the Phaeton. Adjusting levers It is comprised of the variable intake manifold change-over valve, two vacuum units with adjusting levers, a non-return valve, the hoses and the vacuum reservoir in the front area of the vehicle.
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Page 10: Cylinder Block
Engine mechanical system Cylinder block The aluminium cylinder block has a 90° V angle and is manufactured from an aluminium alloy. The pistons run directly on the aluminium alloy's silicon crystals. As a result of this, no separate cylinder liners are required. -
Page 11: Crankshaft Drive
Two connecting rods are located on each crank pin. Due to different gearboxes, the crankshaft fitted in the 4.2l V8 5V engine in the Phaeton has an 8-hole pattern, and that in the Touareg a 10-hole pattern, to the drive plate. -
Page 12: Cylinder Head
Engine mechanical system Cylinder head The aluminium cylinder head has been developed as a cross-flow cylinder head. A good gas cycle and Inlet camshaft therefore a good cylinder charge are achieved as a Drive chain for the result of this. inlet camshaft The cylinder head houses the camshafts, the inlet camshaft drive and adjustment facility plus the valve... -
Page 13: Camshaft Adjustment System
Camshaft adjustment system The gas exchange processes in the engine's combustion chamber exert a significant influence on output, torque and pollutant emission. The camshaft adjustment system allows these gas exchange processes to be adapted to the engine's relevant requirements. This is carried out by changing the valve opening and closing times, depending on the engine speed, with the aid of the inlet camshaft. - Page 14 Engine mechanical system How it works: Depending on the manner in which the camshaft adjustment valve is actuated, the oil is guided into two different control ports. The ports are linked to the chambers on both sides of the adjustment piston. Adjustment in the "retard"...
- Page 15 Engine running Once a specific oil pressure has been reached, the oil presses the locking pin - counter to the spring's force - out of the detent groove, and the inlet camshaft can be adjusted. Torque position The torque position is activated at an engine speed of S341_038 between 1000 and 3600 rpm in the Touareg and Detent groove...
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Page 16: Valve Gear
Engine mechanical system Valve gear Camshaft adjustment valve The V8 engine is equipped with 5-valve technology. Camshaft This offers a large flow crosssection and therefore roller chain ensures a very good gas cycle. The valves are Inlet camshaft actuated via roller rocker fingers with a hydraulic valve clearance compensation element. - Page 17 The roller rocker fingers are mounted on an axle shaft. The axle shaft is used to simultaneously supply the bearings and the hydraulic valve clearance compensation elements with oil. - The hydraulic valve clearance compensation elements are located directly in the lever arm above the valves. - The rollers are each seated between the lever arms.
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