Dynapac DFP12D, Operating Instruction

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9.2 Engine malfunctions
Fault Possible cause Remedy
The engine is hard
to start or does not
start at all
Shut-down pin in STOP position Pull the shut-down pin gently to move it
to operating position
No fuel at the injection pump Check the fuel level, top up if necessary
Check the fuel lines
Check the fuel filter, replace if necessary
Injection nozzle out of order Have it checked by qualified expert per-
sonnel
Incorrect valve clearance Check the valve clearance, adjust if nec-
essary
Cylinder or piston rings worn Have it checked by qualified expert per-
sonnel
Engine does not
start or starts poorly
at low temperatures
Paraffin sweats in the fuel due to insuffi-
cient low temperature resistance
Use winter-grade fuel
Engine oil with wrong SAE viscosity class Changing the engine oil
Engine does not
crank when oper-
ating the recoil
starter
Recoil starter defective Replace the recoil starter
Spring broken Replace the recoil starter
The starter rope
does not return to
the initial position
Recoil starter dirty Clean the recoil starter
Insufficient pretension of the spring Check the pretension of the spring, adjust
if necessary
Spring broken Replace the recoil starter
Engine ignites, but
does not run
Fuel filter clogged Check the fuel filter, replace if necessary
Engine stops Fuel tank empty Check the fuel level, top up if necessary
Fuel filter clogged Check the fuel filter, replace if necessary
Tank ventilation blocked Ensure sufficient ventilation of the tank
Air in the fuel system Check the fuel system for air entry.
Check the ventilation valve.
Mechanical defect Have it checked by qualified expert per-
sonnel
Engine looses
power and speed
Fuel tank empty Check the fuel level, top up if necessary
Tank ventilation blocked Ensure sufficient ventilation of the tank
Air in the fuel system Check the fuel system for air entry.
Check the ventilation valve.
Engine looses
power and speed,
black exhaust
smoke
Air filter dirty Clean, replace if necessary
Incorrect valve clearance Check the valve clearance, adjust if nec-
essary
Troubleshooting – Engine malfunctions
DFP12D 93