Description And Operation; Valve Device - SSANGYONG Rexton Y200 Manual

1B3-2 DIESEL ENGINE MECHANICAL

VALVE DEVICE

Operation
The diesel engines have valves with bucket tappets
and automatic valve clearance adjustment. This
eliminates the need to re-set the valve clearance.
The compact design of the valve timing gear from the
cam through the bucket tappet to the valve contributes
to weight savings, to low drag power and also to
increased rigidity. Oil is supplide to the bucket tappets
through oil bores in the cylinder head.
1 Cam
2 Camshaft
3 Tappet
The maintenance-free hydraulic valve clearance
adjusting elements automatically compensates the
valve clearance resulting from thermal expansion and
wear.
This produces a quiet-running valve train.

DESCRIPTION AND OPERATION

YAD1BA10
4 Oil
5 Valve
YAD1BA20
Function
1 Cam
2 Tappet
3 Guide Sleeve
4 Thrust Piece
The hydraulic valve clearance adjusting elements are
installed in the bucket tappets and operate the valves
directly through the thrust pins and guide sleeves.
When the engine is running and a load is applied on
the element by cam tip, the element cam go down
fully. The oil displaced from the working chamber flows
via the annular gap (clearance between guide sleeve
and thrust pin) to the supply chamber.
As soon as the cam lobe rotates upwards from the
tappet (2), the load on the guide sleeve (3) is relieved.
The spring (5) pushes the thrust pin (4) up until the
tappet is resting against the cam (1). The vacuum
produced in the working chamber (b) as a result of the
upward movement of the guide sleeve opens the ball
valve (6) and oil flows out of the supply chamber (a)
into the working chamber (b).
The ball valve closes when the cam presses against
the tappet and thus applies pressure on the thrust
pin.
The oil in the working chamber acts as a "hydraulic
rigid connection" when the engine is running and the
relevant valve is opened. The oil required for this
purpose is supplied to the elements along a
longitudinal passage in the cylinder head. From here,
the oil flows through a bore to the relevant adjustment
element.
The oil to the supply chamber flows via the groove
provided in the base of the tappet.
YAD1BA30
5 Pressure Spring
6 Ball Valve
a Supply Chamber
b Working Chamber
SSANGYONG Y200