Section H.
В
Troubleshooting
Belarus – 510/512 Operating manual
113
Section H. TROUBLESHOOTING
Table H-1
TROUBLE, EXTERNAL MANIFESTATION
REMEDY
ENGINE
Engine does not start
Air in the fuel system.
Faulty fuel pump.
Pump the system with manual priming pump. If
necessary, eliminate air inflow.
Remove the fuel pump from the engine and send it
to the shop for repair.
Engine fails to develop full power
There is no full fuel feed due to misalignment of
fuel pump control rods.
Filtering element of fuel fine filter is clogged.
Faulty injectors.
Wrong fuel injection advance angle.
Engine air cleaner clogged.
Adjust control rods.
Replace filtering element.
Locate the faulty injectors, wash and adjust
them.
Set the recommended injection advance angle.
Perform MS for air cleaner.
Engine runs unstably at idle speed
Ingress of air into the fuel system.
Idling springing the fuel pump is not adjusted.
Fuel pump failure.
Remove air from fuel system.
Adjust idling spring (for engines with fuel pump
4UTNM or 4UTNI).
Remove the fuel pump from the engine and send it
to the shop for repair.
The engine fumes at all the operation modes
A. Black fume is emitted from the exhaust pipe
Engine air cleaner clogged.
Injector atomizer needle sticking.
Poor quality of fuel.
Fuel pump failure.
Perform maintenance service for air cleaner.
Detect the faulty injector, wash or replace the at-
omizer, if necessary adjust the injector.
Replace fuel with the recommended one.
Remove the fuel pump from the engine and send it
to the shop for repair.
B. White fume is emitted from the exhaust pipe
Engine not warmed up.
Clearances between the valves and the rockers not ad-
justed.
Water in fuel.
Fuel injection advance angle setting is disturbed.
Warm up the engine; maintain the coolant temperature
at 75 to 95°C during operation.
Adjust clearances.
Change fuel.
Set the recommended fuel injection advance angle.