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🔧 Diesel Engine Basics
Why do diesel trucks generally have longer service lives than gasoline trucks?
How often should heavy-duty diesel engines undergo full service?
What are the top causes of diesel engine power loss?
How can I tell if my diesel injectors are failing?
What are the warning signs of a bad turbocharger?
How much does it cost to rebuild a heavy-duty diesel engine?
Which diesel engine brands are most reliable for long-haul trucks?
How does cold weather affect diesel engine starting and performance?
What is a diesel particulate filter (DPF) and how does it function?
What are the best methods to clean or regenerate a clogged DPF?
🛢️ Fuel System Issues
11. What are the symptoms of diesel fuel contamination?
12. How often should fuel filters be replaced on heavy trucks?
13. How can I bleed air out of a diesel fuel system?
14. What causes black smoke from a diesel exhaust?
15. What leads to white smoke in diesel engines?
16. How do you test fuel pressure on a common-rail system?
17. What’s the proper procedure for cleaning diesel injectors?
18. What additives can prevent diesel gelling in winter?
19. What happens if a diesel tank runs completely dry?
20. How much does it cost to replace high-pressure fuel injectors?
⚙️ Transmission & Drivetrain
21. Why is my truck experiencing hard or delayed shifting?
22. How can I diagnose a slipping clutch on a heavy vehicle?
23. What causes transmission fluid contamination?
24. How often should I change transmission oil and filters?
25. What are the telltale signs of a failing driveshaft?
26. How do you adjust clutch free-play on manual transmissions?
27. Why does my drivetrain vibrate under load?
28. What maintenance is required for an Eaton Fuller transmission?
29. How can you detect a bad universal joint (U-joint)?
30. What causes differential noise in heavy trucks?
❄️ Cooling & Exhaust Systems
31. Why is my diesel truck overheating without visible leaks?
32. How do you pressure-test a cooling system?
33. What are the symptoms of a failing water pump?
34. How can you detect a blown head gasket?
35. What is cavitation and how does it damage diesel engines?
36. Why does my coolant pH matter, and how do I check it?
37. What causes exhaust manifold leaks on big-bore engines?
38. How do you inspect a DEF (diesel exhaust fluid) system for faults?
39. How do you force a DPF regeneration cycle?
40. What leads to loud exhaust noise or leaks downstream of the turbo?
🛑 Brake Systems
41. What causes air brakes to lose pressure while parked?
42. How do you locate and repair air system leaks?
43. What are the steps to bleed air brake chambers?
44. How does ABS work on heavy trucks, and how do you test it?
45. What leads to uneven brake pad or drum wear?
46. How often should air dryer cartridges be changed?
47. What is a slack adjuster and how do you check it?
48. Why do trailer brakes sometimes lock up?
49. How do you adjust trailer brake shoe clearance?
50. How is a brake chamber replacement performed on a semi trailer?
🚚 Trailer Maintenance
51. How do you inspect a trailer kingpin for wear?
52. What causes uneven trailer tire wear?
53. How do you test and repair trailer ABS modules?
54. What are common trailer frame cracks and how do you spot them?
55. How do you replace trailer air lines and fittings?
56. What maintenance do suspension airbags require?
57. How do you lubricate fifth-wheel and landing-gear components?
58. How often should trailer wheel bearings be repacked?
59. How do you check and adjust trailer ride height?
60. What does a DOT trailer inspection cover?
⚡ Electrical & Diagnostics
61. How do you pull engine fault codes without OEM software?
62. What does a “check engine” light mean on a diesel truck?
63. How can you diagnose a bad alternator?
64. Why won’t my batteries hold a charge under load?
65. What causes trailer lights to flicker intermittently?
66. How do you test CAN-bus communication faults?
67. What are the symptoms of a failing ECM (engine control module)?
68. How do you reset the truck’s ECU?
69. What tools are needed for heavy truck diagnostics?
70. How do you troubleshoot starter-motor no-crank issues?
🛠️ Preventive Maintenance & Inspections
71. What should be on a daily pre-trip PM checklist?
72. How often should oil and filters be changed?
73. What does a B-service include on a heavy truck?
74. How do you create a fleet maintenance schedule?
75. What paperwork is required for DOT Level 1 inspections?
76. How often should air filters be replaced?
77. What preventive steps extend DPF life?
78. How frequently should coolant be flushed?
79. What safety checks are essential before hauling a load?
80. How do you record and track maintenance history?
🚛 Tires & Wheels
81. What causes cupping on truck tires?
82. How often should semi-truck tires be rotated?
83. How do you balance large commercial tires?
84. What leads to inner tire wear on steer axles?
85. How do you torque wheel nuts to spec?
86. How do you inspect wheel bearings for play?
87. What are signs of tire separation?
88. How do you check tire pressure chart for trailers?
89. What causes uneven axle loads?
90. How do you detect a bent axle shaft?
🎓 Career & Buying Advice
91. What qualifications are needed to become a diesel mechanic?
92. How much do heavy diesel mechanics earn on average?
93. What tools should every diesel mechanic own?
94. Is diesel mechanic a good long-term career?
95. How hard is diesel mechanic training school?
96. What should I inspect when buying a used semi-truck?
97. How can you improve diesel truck fuel economy?
98. Should I delete emissions equipment on my truck?
99. What causes high maintenance costs for older diesels?
100. How can I extend the overall lifespan of my diesel engine?