Operation0420−1/A1
Winterthur Gas & Diesel Ltd.
2/ 3
3.1 Maximum Firing pressure
Too High at Correct
Compression Pressure
Possible causes:
D Ignition (start of injection) too advanced
for the fuel type in use.
You must adjust the FQS as follows:
1) In the remote control, get the user
parameters page (see 4002−3
paragraph 1.1).
2) In the FQS field, enter a positive (+)
setting to correct the the ignition
pressure.
You can only do a correction of the FQS if
all cylinders show the same pressure
difference.
3.2 Maximum Firing Pressure
Too Low at Correct
Compression Pressure
Possible causes:
D Unsatisfactory combustion: The nozzle
tip has trumpets or is worn.
D Ignition (start of injection) too retarded for
the fuel type in use.
1) Do a check of the injection nozzles.
2) In the remote control, get the user
parameters page (see 4002−3
paragraph 1.1).
3) In the FQS field, enter a negative (−)
setting to correct the the ignition
pressure.
You can only do a correction of the FQS if
all cylinders show the same pressure
difference.
3.3 Compression and Maximum
Firing Pressure Too Low
Possible causes:
D The load is less than you think.
D The exhaust valve has a leak.
D The scavenge air pressure is too low.
D The suction temperature is too high.
D VEC timing is incorrect i.e. exhaust valve
closing time too late (parameter in
WECS−9520).
1) Do a check of the exhaust valve.
2) Clean the turbocharger or scavenge air
cooler (see 6510−1 and 6606−1,
paragraph 3).
2014
Indicator Diagrams
Example B
Example A
Example B
Example A
Example B
P
F
P
C
P
C
P
F
P
F
P
C
P
C
P
F
P
C
P
F
P
F
P
C
P
C
004.755/00
004.756/00
004.757/00
004.758/00
004.754/00
Example A
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