Mosa GE 20 YSX, Use And Maintenance Manual

Troubleshooting

Diesel engine

28/01/03  M40I_1500G_GE

M

40.2

REV.3-07/06

Problem

Possible cause

Solution

ENGINE

The motor does not start up

1)  Start-up switch (I6) (where it is assembled) in 

incorrect position

2)  Emergency button (L5) pressed

3)  Preheating (where it is assembled) 

4)  Engine control unit or starting key faulty. 

5)  Battery low

6)  Battery cable terminals loose or corroded

7)  Start-up motor defective

8)  No fuel or air in feed circuit

9)  Malfunction  on  feed  circuit:  defective  pump, 

injector blocked, etc.

10)  Air filter or fuel filter clogged

11)  Air in the gasoil filter. 

12)  Motor stopping device defective

13)  Malfunction on electrical power circuit on ge-

nerator control panel

1)  Check position

2)  Unblock

3)  Lacking  or  insufficient  preheating  phase  for 

sparkplugs. 

Malfunction in circuit: repair.

4)  Replace

5)  Recharge or replace.

Check the battery charge circuit on motor and 

automatic panel.

6)  Tighten and clean. Replace if corroded.

7)  Repair or replace.

8)  Refill tank, un-aerate the circuit.

9)  Ask for intervention of Service Department.

10)  Clean or replace

11)  Take the air out filling the filter with gasoil.

12)  Replace.

13)  Check and repair.

The motor does not accelerate. 

Inconstant speed.

1)  Air filter or fuel filter clogged.

2)  Malfunction  on  feed  circuit:  defective  pump, 

injector blocked, etc.

3)  Oil level too high.

4)  Motor speed regulator defective.

1)  Clean or replace.

2)  Ask for intervention of Service Department.

3)  Eliminate excess oil.

4)  Ask for intervention of Service Department

Black smoke

1)  Air filter clogged.

2)  Overload.

3)  Injectors  defective.  Injection  pump  requires 

calibration.

1)  Clean or replace

2)  Check the load connected and diminish.

3)  Ask for intervention of Service Department.

White smoke

1)  Oil level too high.

2)  Motor cold or in prolonged operation with little 

or no load.

3)  Segments and/or cylinders worn out.

1)  Eliminate excess oil.

2)  Insert load only with motor sufficiently hot

3)  Ask for intervention of Service Department.

Too  little  power  provided  by 

motor.

1)  Air filter clogged.

2)  Insufficient fuel distribution, impurities or water 

in feed circuit.

3)  Injectors dirty or defective.

1)  Clean or replace.

2)  Check the feed circuit, clean and refill once 

again.

3)  Ask for intervention of Service Department.

Low oil pressure

1)  Oil level insufficient

2)  Air filter clogged.

3)  Oil pump defective.

4)  Alarm malfunction.

1)  Reset level. Check for leaks.

2)  Replace filter.

3)  Ask for intervention of Service Department.

4)  Check the sensor and electrical circuit.

High temperature

1)  Overload

2)  Insufficient ventilation.

3)  Insufficient coolant liquid (Only for water cooled 

motors)

4)  Water radiator or oil clogged (where it is as-

sembled)

5)  Water  circulating  pump  defective  (Only  for 

water cooled motors)

6)  Injectors  defective.  Injection  pump  requires 

calibration

7)  Alarm malfunction

1)  Check the load connected and diminish.

2)  Check the cooling vent and relative transmis-

sion belts

3)  Restore level. Check for leaks or breakage in 

the entire cooling circuit, pipes, couplings, etc.

4)  Clean cooling fins on radiator

5)  Ask for intervention of Service Department

6)  Ask for intervention of Service Department

7)  Check the sensor and electrical circuit