Operation
0850−1/A1
Winterthur Gas & Diesel Ltd.
31/ 39
Failure Text
ME Exh. Valve Late/Not Opening (slowdown) (ID 75)
FCM−20 No. LED Failure ID Display
Indication #01 to #09 75 75
Cause
The exhaust valve opens 15_CA or more after the crank angle setpoint
Procedure ⇒ Do a check of the ON times of the rail valve 4.76.
⇒ Make sure that the cables between the rail valve 4.76 and the related FCM-20 have no
damage and are correctly connected.
⇒ If the failure is shown for all cylinders, do the checks that follow:
⇒ Do a check of the the air spring pressure. Make sure that the pressure is not too high.
⇒ In the Valve Control Unit (VCU), do a check of the non-return valve of the oil supply to the
hydraulic pipe 4.66.
⇒ Do an internal check of the VCU 4.10 for a mechanical failure.
⇒ Make sure that the hydraulic piston in the exhaust valve drive 4.03 moves freely.
⇒ Do a check of the related FCM-20.
⇒ Repair or replace damaged cables between the rail valve and the related FCM−20.
⇒ If necessary, replace the related FCM-20, VCU 4.10, rail valve 4.76, exhaust valve drive 4.03
or non-return valve 4.06.
Failure Text ME Exh. Valve Early Closing (slowdown) (ID 76)
FCM−20 No. LED Failure ID Display
Indication #01 to #09 76 76
Cause
The exhaust valve closes 10_CA or more before the crank angle setpoint
Procedure ⇒ Do a check of the air spring pressure. Make sure that the pressure is not too high.
⇒ Do a check of the non-return valve in the VCU 4.10.
⇒ Make sure that the orifice in the VCU is not blocked.
⇒ Do an internal check of the VCU for mechanical failure. Replace the VCU with the adjacent
VCU to find the cause of the malfunction.
⇒ Do a check for leaks in the hydraulic system (hydraulic pipes etc).
⇒ Do a check of the related FCM−20.
⇒ If necessary, replace the related FCM−20.
2014
Failures and Defects of WECS Components
To Next Page
Loading...
Need help?
General
