NC SW6 Maintenance Instructions Manual page 64

CHART A13—Engine exhaust smoke excessive (Black smoke)
Cause
Engine being lugged down.
Air intake or exhaust system is blocked.
Air leak between turbocharger and the intake
manifold.
Exhaust leak at the manifold or turbocharger. Check/correct leaks in the manifold or turbocharger gaskets. Look
Turbocharger waste-gate faulty.
Turbocharger malfunction.
One or more injector worn or
malfunctioning.
Worn or malfunction fuel injection pump
(FIP). Injection pump not delivering fuel.
Injection pump timing incorrect.
Retarded if smokes under load and
•
engine quieter than normal.
Advanced is smokes under load and
•
engine noisier than usual.
Engine compression low in one or more
cylinders.
Fault Finding
Use appropriate gear for the task.
Visually check the air intake and exhaust intake for blockage or
obstruction-remove as required. Check the air filter elements for
signs of blocking-replace as required.
Check/correct leaks in the air crossover tube, hoses, or through
holes in the manifold cover.
for a cracked manifold.
Repair or replace waste-gate.
Replace turbocharger.
Check and externally clean the injector. If the problem still
persists, the injector must be checked by a FIE specialist or replace
with new.
Check for operation of the FIP.
The FIP must be taken to a local FIE specialist to have the fuel
delivery timing checked. Ensure that all obvious causes have been
eliminated before removing the FIP. (Needs to be, Delphi DP210
capable agent for mechanical engines and for common rail
electronic engines see Delphi agent or JCB dealer
(www.delphi.com or www.jcb.com)
If the pump has recently been removed and replaced the timing
could be incorrect if the correct removal procedures were not
followed.
The timing can only be checked by a FIE specialist using the
correct equipment.
Check the engine compression.
Remedy
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