NC HT1.0 - Fault Finding; Engine exhaust smoke excessive (Black smoke)

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Fault Finding
CHART A13—Engine exhaust smoke excessive (Black smoke)
Cause
Remedy
Air intake or exhaust system is blocked. 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.
Exhaust leak at the manifold . Check/correct leaks in the manifold gasket. Look for a cracked
manifold.
One or more injector worn or
malfunctioning.
Check and externally clean the injector. If the problem still
persists, the injector must be checked by a FIE specialist or replace
with new.
Worn or malfunction fuel injection pump
(FIP). Injection pump not delivering fuel.
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. (Check with local Kubota
agent)
Injection pump timing incorrect.
• Retarded if smokes under load and
engine quieter than normal.
• Advanced is smokes under load and
engine noisier than usual.
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.
Engine compression low in one or more
cylinders.
Check the engine compression.