Operation
2751−1/A1
Winterthur Gas & Diesel Ltd.
5/ 6
3. Lubrication
Leakage oil from the outside piston (4, Fig. 2) and inside piston (5) lubricates the air
spring piston (10). Oil in the leakage oil collection space (LS) drains to the leakage oil
drain (LD).
While the exhaust valve closes, oil flows through the air spring piston (10) and goes
into the air spring (AS). The air from the air inlet (AI) changes the oil that collects at
the bottom of the air spring (AS) (at the inlet bore IB) into an oil mist. This oil mist
lubricates the top part of the valve spindle (6).
When the exhaust valve opens, unwanted oil flows out of the air spring (AS) through
the air spring pipe to an accumulator. The oil in the accumulator automatically drains
through the leakage oil pipe at the driving end of the exhaust valves into the
crankcase.
Oil from the oil bath (OB) lubricates the valve spindle (6).
Note: The oil supply OS from the cylinder lubrication flows to the guide
bush (7). This gives more lubrication to the valve spindle (6) during
engine operation. For more data, see 7218−1, paragraph 7.
II - II
LD
2
III - III
OS
2
1
LS
IB
AS
17
AI
9
7
OB
1
016.875/08
016.875/08
Fig. 3: Leakage Oil Drain, Air Inlet to Air Spring and Oil Supply to Valve Guide
1 Valve cage AI Air inlet (to air spring)
2 Lower housing AS Air spring
7 Guide bush IB Inlet bore (to air spring)
9 Distance ring LD Leakage oil drain
17 Non-return valve LS Leakage oil (collecting space)
OB Oil bath
OS Oil supply (to valve guide)
Exhaust Valve
2014
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