65
Fault Finding
CHART A14—Engine exhaust smoke excessive (White/Blue
smoke)
Cause
Remedy
Fuel is contaminated or incorrect grade of
diesel used.
Refer to
Fluids & Lubricants
section for recommended diesel
fuels. If the fuel is suspect, verify by operating the engine with
clean fuel from a temporary tank.
Oil level incorrect.
Check oil level.
Diesel or hydraulic oil in sump.
Check oil consistency. If oil contamination is suspected check
hydraulic oil pump for leaks past the seal into the engine. Drain,
flush and fill with clean oil.
Coolant temperature too low (over cooling).
Light blue or white, high speed/light load.
Refer to
Chart D3.
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.
One or more injector worn or
malfunctioning.
White/blue smoke at operating temperature.
Check and externally clean the injector. If the problem still
persists, the injector must be checked by a FIE specialist or replace
with new.
Coolant leaking into combustion chamber.
Refer to
Chart D1.
Leaking valve stem seals.
Evident after long idle period then
acceleration.
Replace valve seals.
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. (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)
Piston rings not sealing.
Evident with persistent blue smoke at all
speeds/loads.
Check the engine compression.
