67
Fault Finding
CHART B1—Fuel consumption excessive
Cause
Remedy
Additional load on engine.
Check/repair accessories and vehicle components.
Operator technique.
Review operation for correct gear shifts, deceleration and idling.
Fuel Leaks.
Check for external leaks and engine lubricating oil dilution. For
fuel dilution check for internal leaks at the fuel transfer pump and
injection pump.
Inspect and correct as required leaks in the high pressure lines,
fittings injector sealing washers, or delivery valves.
WARNING:
Fine jets of fluid can penetrate the skip. Keep face
and hands well clear of pressurised fluid and wear protective
glasses. If fluid penetrates your skin seek medical help
immediately.
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.
Intake air or exhaust leaks.
Refer to
Charts A13 & A14.
Engine compression low in one or more
cylinders.
Check the engine compression.
Injection pump timing incorrect.
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.
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. (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)
Inlet & exhaust valve clearances set
incorrectly.
Set the valve clearances to the recommended clearances.
