Malfunction
Possible cause
Remedy
Tank ventilation blocked
Ensure sufficient ventilation of the tank
Air in the fuel system
Check the fuel system for air leaks.
Check the ventilation valve.
Engine looses
power and speed,
black exhaust
smoke
Air filter dirty
Clean, replace if necessary
Incorrect valve clearance
Check, adjust the valve clearance
Injection nozzle out of order
Have checked by qualified expert per-
sonnel
Engine overheats
Engine oil level too high
Check, drain off if necessary
Lack of cooling air
Clean the cooling fins and the cooling air
intake openings.
Check air guide plates and ducts for com-
pleteness and good sealing.
Engine runs with
high speed, but no
vibration
Centrifugal clutch defective
Have checked by qualified expert per-
sonnel
V-belt broken
Replacing the V-belt
Troubleshooting – Engine malfunctions
BPR 50/55 D
104
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