Volkswagen Golf Diesel 2009 Mode D'emploi page 263

Engine Mechanicals
1st Plane — Balance Shaft Drive
Two cylinder block housed balance shafts are used
to counteract unwanted vibration at engine speeds
above 4000 rpm from being transmitted to the car
body.
The balance shafts run at twice the engine speed in
opposite direction from one another. The direction
of the second shaft is reversed by an idler gear. The
horizontally staggered arrangement of the balance
shafts also helps reduce vibration.
The balance shafts are made from spheroidal
graphite cast iron and run in three bearings.
Hydraulic Chain
Tensioner
Tensioning Rail
Chain Sprocket
14
Chain lubrication is provided by oil returning from the
cylinder head. Oil is collected and distributed to the
chain by a separate lubrication channel.
Mounting the balance shafts in the cylinder block has
the following advantages:
– The cylinder block provides higher rigidity
– Oil foaming is eliminated by moving the rotating
parts away from the oil sump
Balance Shafts
Guide Rail
Idler Gear
Slide Rail