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3
MALFUNCTIONS
3.1 LOOKING FOR MALFUNCTIONS
PROBLEM
PROBABLE CAUSE
Clogged pipes
Clogged fuel filter
Air in the fuel circuit
Clogged tank breather
Faulty fuel pump
Blocked injector
Blocked injection pump valve
Injector not adjusted
Excess leaking in the plunger
Jammed injection pump delivery control
Wrong injection pump delivery setting
High oil level
Blocked pressure relief valve
Worn oil pump
Air in the oil intake pipe
Faulty pressure gauge or switch
Clogged oil suction hose
Burnt fuse on pre-heating glow plugs
Failure in glow plugs control unit
Discharged battery
Inefficient or wrong cable connection
Faulty ignition switch
Faulty starter motor
Air filter clogged
Excessive idle operation
Incomplete running-in
Overloaded engine
Clogged cooling circuit
Slack or broken fan control belt
Incorrect injection timing
Delayed injection
Incorrect governor linkage adjustment
Broken or loose governor spring
Low idle setting
Worn or stuck piston rings
Worn or scored cylinders
Worn valve guides
Valves stuck
Worn crankshaft/connecting rod bearings
Non-sliding speed governor leverage
Driving shaft not turning freely
Damaged head gasket
Slack pump/injector control rod
Incorrect pump/injector delivery balancing
Service Manual LDW FOCS 502 automotive _ cod. ED0053027270 - 3° ed_rev. 02
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