Volkswagen Golf Diesel 2009 Mode D'emploi page 260

INA Camshaft Adjustment System
The 2.0L TSI engine uses a hydraulic vane cell
adjuster on the intake camshaft to affect valve
timing. Only the intake camshaft has variably
adjusted timing on this engine. Oil pressure for this
task is provided by the engine oil pump.
The variable camshaft adjuster provides an
adjustment range of 60° crank angle. The camshaft
is locked in the retard position at engine shut-off.
This function is performed by a spring-loaded locking
pin. The camshaft is released when the engine oil
pressure exceeds 7 .25 psi (0.5 bar).
The rotor of the vane cell adjuster is welded to the
intake camshaft. The 4/3-way central valve required
for adjuster control is integrated in the camshaft.
Low-Friction
Bearing
Camshaft
Adjustment
Valve 1 N205
Armature
Shaft with Ball
Winding
Cover
4/3-Way
Central Valve
Coil Element
Engine Mechanicals
Intake camshaft timing is map-controlled by the
engine control module. The goals are to improve
engine power, enhance running smoothness, and
reduce emissions (through internal exhaust gas
recirculation).
Function
Pressurized oil fl ows to the central valve via the
camshaft bearing through bores in the camshaft.
From here, depending on adjustment requirements,
the oil fl ows through additional bores in the camshaft
to one of the chambers in the adjuster.
Stator
Vane with Spring
Camshaft with Bores
for Hydraulic Control
Locking Pin
Locking Spring
Rotor
11