Black exhaust smoke

Checks by the user

  • Restriction in filter/cleaner or air induction system
  • Fault in atomisers or atomisers of an incorrect type
  • Fault in cold start system
  • Wrong type or grade of fuel used
  • Restriction in exhaust pipe
  • Engine temperature is too low
  • Valve tip clearances are incorrect

Check by the workshop personnel

  • Fault in fuel injection pump
  • Timing of fuel injection pump is incorrect
  • Valve timing is incorrect
  • Bad compression
  • Cylinder head gasket leaks
  • Valves are not free
  • Worn cylinder bores
  • Leakage between valves and seats
  • Piston rings are not free or they are worn or broken
  • Turbocharger impeller is damaged or dirty
  • Induction system leaks (turbocharged engines)