Operation8135−1/A1
Winterthur Gas & Diesel Ltd.
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2. Function
When the load is less than 85% (referred to in the ISO conditions), the force of the
spring in the actuator (6, Fig. 2) keeps the butterfly valve (3) in the closed position.
2.1 Open
When the engine load is more than 85%, the charge air pressure increases to more
than the set limit. The ECS energizes the 3/2-way solenoid valve (7), air spring air is
released through the control air pipe (13) to the actuator (6) and the butterfly valve (3)
opens (see Fig. 2, Fig. 3 and Fig. 4).
2.2 Close
When the engine load decreases to less than 85% and the charge air pressure
decreases to less than the set limit, the ECS de-energizes the 3/2-way solenoid valve
(7). This stops the air spring air supply. The pressure in the system is released and
the spring in the actuator (6) closes the butterfly valve (3).
If a part becomes defective, alarm messages are activated in the ECS and shown in
the alarm and monitoring system (see 0820-1 Operating Problems, paragraph 6).
3. Function check
A function check is necessary when the engine operates for long periods at low
engine load with the exhaust waste gate closed. Do the function check that follows
one time each week.
You can do this function check:
D When the engine has stopped, or
D When the engine operates at less than 70% load.
You can do Procedure One, or Procedure Two.
3.1 Procedure One
1) On the 3/2-way solenoid valve (7, Fig. 2), turn the screw (11) inwards until the
butterfly valve (3) opens.
2) Turn the screw (11) back to its initial position (see Fig. 3).
3.2 Procedure Two
1) In the LDU-20, get the USER PARAMETERS page (see 4002-2, paragraph 3.10
User parameters).
2) In the row Exhaust waste gate, select the button OPEN. The waste gate opens.
Note: After 20 seconds the waste gate will close automatically.
Exhaust Waste Gate (Low-load Tuning)
2014
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