Operation
0515−1/A1
Winterthur Gas & Diesel Ltd.
1/ 8
Faults in High Pressure Fuel System
1. Defective Fuel Pump 1..............................................
1.1 Fault Identification 1..........................................
1.2 Causes 1.....................................................
1.3 Procedure 1..................................................
2. Defective Fuel Pump Actuator 2.....................................
2.1 Fault Identification 2..........................................
2.2 Causes 2.....................................................
2.3 Procedure 3..................................................
3. Defective Injection Control Unit 4....................................
3.1 Fault Identification 4..........................................
3.2 Causes 4.....................................................
3.3 Procedures 5.................................................
4. Defective Fuel Pressure Control Valve 7..............................
4.1 Fault Identification 7..........................................
4.2 Causes 7.....................................................
4.3 Procedure 8..................................................
1. Defective Fuel Pump
1.1 Fault Identification
Fault identification is as follows:
D Higher regulating shaft positions of the fuel pump rows at the same output
compared with the acceptance report.
D Unusual noises e.g. knocks, rings and scrapes.
D The level switch LS3426A (17) shows an alarm (see 8019−1 Fuel system,
paragraph 4).
1.2 Causes
The causes of the defects are given below:
D The pump plunger cannot move. The spring is broken. The regulating sleeve is
blocked.
D The roller is blocked. There is damage to the cam. The roller guide is seized.
D An HP pipe is broken.
D The regulating linkage or toothed rack are blocked.
1.3 Procedure
D Stop the engine.
D Cut out the related fuel pump (see 5556−2 Cutting Out and Cutting In of the Fuel
Pump).
D Replace the defective parts as soon as possible (see 5556−1 Fuel Pump and in
the Maintenance Manual 5552−2 Supply Unit).
2014
Operation during Unusual Conditions
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