126 / 1526
87
4 DLT ENGINE
Black / Dark Grey at full load
Black / Dark Grey at high load
Black / Dark Grey any load
Blue /
White at light load
Blue at light load / acceleration
Blueany load
Cause
Check
1. Overspeeding
1. Maximum speed setting
2. Lub oil induction
2. Oil bath air cleaner for overfilling (Wherever fitted)
3. Choked Venturi
3. Venturi (Pneumatic Governor) is not restricted (Wherever fitted)
4. Retarded timing
4. Pump to engine timing, auto advance function
5. Incorrect atomisation
5. Injectors - see chart
6. Air Starvation
6. Air cleaner ducting restrictions; turbo operation
7. HP Pipes
7. Bore size; length; restrictions
8. Cold Engine
8. Thermostat : Cooling system, operation
9. EGR valve is permanently open
9. Functioning of valve, setting of EGR switch
10. Carbon deposition in intake system 10. Cleanliness of EGR valve, intake manifold
11. VSV valve not working properly
11. Vacuum connections to VSV and its functioning
12. Advanced Timing
12. Pump to engine timing; auto advance function
13. Poor Compression
13. Setting / condition of valves, piston rings + air intake
14. Overfuelling
14. F.I. Pump, excess fuel device
15. Incorrect Atomisation
15. Injector type / setting / condition
16. Poor combustion
16. Injector fitment
17. Retarded timing
17. Pump to engine timing; auto advance function
18. Lub oil passing pistons
18. Piston / ring/ bore condition
19. Lub oil passing valves
19. Valve stem / guide condition
FAULT DIAGNOSIS SMOKE
Symptom
l
l
l
l
l l
l
l
l
l
l
l
l
l
l
l l l
l
l
l
l
Speed
Maximum
Medium
to
Maximum
Low to
Medium
All