MTZ 952 - Troubleshooting

Troubleshooting
MTZ series 900
219
TROUBLESHOOTING
TROUBLE, EXTERNAL MANIFESTATION
REMEDY
ENGINE
The engine fails to start
Air in the fuel system.
Pump the system with manual priming pump. If neces -
sary, eliminate air inflow.
Faulty fuel pump.
Take fuel pump away and send it to the shop for repair.
The engine fails to develop the full power
There is no full fuel feed due to misalignment of fuel
pump control rods.
Adjust control rods.
Filtering element of fuel fine filter is clogged.
Replace filtering element.
Faulty injectors.
Locate the faulty injectors, wash and adjust them.
Wrong fuel injection advance angle.
Set the recommended injection advance angle.
Engine air cleaner is clogged.
Perform the service of the air cleaner.
The engine runs unstably at idling
Ingress of air into the fuel system.
Remove air from fuel system.
Idling springing the fuel pump is not adjusted.
Adjust idling spring (for engines with fuel pump 4УТНМ
or 4УТНИ).
Faulty fuel pump.
Remove the fuel pump from the engine and send it for
repair.
The engine fumes at all the operation modes
А. Black fume is emitted from the exhaust pipe
Engine air cleaner is clogged.
Service the air cleaner.
Injector atomizer needle sticking. Injector atomizer needle
sticking.
Detect the faulty injector, wash or replace the atomizer, if
necessary adjust the injector.
Poor fuel quality.
Replace fuel with the recommended one.
Faulty fuel pump.
Remove the fuel pump from the engine and send it for
repair.
B. White fume is emitted from the exhaust pipe
Engine is not heated.
Warm up the engine; maintain the cooling liquid tempera -
ture within 75 - 9 5 C during operation.
Clearances between the valves and the rockers are not
adjusted.
Adjust clearances.
Water in the fuel
Replace the fuel.
Fuel injection advance angle setting is disturbed.
Set the recommended fuel injection advance angle.
C. Blue fume leaves the exhaust pipe
Ingress of oil into the combustion chamber as a result of
wear of cup-piston group components
Replace the worn-out parts of the cup-piston group.
Excess of oil in the engine crankcase.
Drain the excessive oil, having set the level against the
upper mark of oil-measuring rod.
The engine overheats
Cooling fluid boils in the radiator. Poor fuel atomization by
the injectors.
Clean the radiator from dirt and dust, if necessary, clean
cooling system from scale; adjust the fan belt tension.
Detect the faulty injectors, wash, clean and adjust them.