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TROUBLE SHOOTING FOR PETROL ENGINE


Listed below are some of the possible causes of engine operating defects. Carry out simple tests before proceeding with disassembly operations or making substitutions.

POSSIBLE CAUSES TROUBLE

GENERAL

Grounded sparking plug *   *               *    
Disconnected or broken spark cable *                   *    
Faulty coil * *               *      
Faulty rotor *                        
Loosened or oxidized cable clamp *                        
Demagnetized flywheel *   *             *     *

FUEL LINE

Clogged piping * * *               *    
Clogged fuel filter * *                      
Presence of air in the fuel circuit * *                      
Clogged tank breather (cap) * *                      
Clogged carburettor breathers * *       *       * *    
Dirty carburettor * *       *       * *    
Blocked carburettor needle valve   *               *      

ELECTRICALS

Discharged battery *                        
Faulty starting switch *                        
Faulty starting motor *                        

MAINTENANCE

Air filter clogged                          
Excessive idle operation   *       *       *      
Incomplete running-in         *                
Engine overloaded         *         *      
Clogged flywheel and sidewalls                 *        

ADJUSTMENT

Adjust carburetion   * *             *   *  
Low idling setting   *                      
Worn or blocked piston rings     *   *     *   *      
Worn or blocked cylinder     *   *     *   *      
Sticking valves * * *           *        
Excessive valve clearance                          
Broken timing belt                          
 

POSSIBLE CAUSES AND TROUBLE SHOOTING FOR GL 400 II A DIESEL ENGINE


The following table contains the possible causes of some failures which may occur during operation. Always perform these simple checks before removing or replacing any part.

POSSIBLE CAUSES TROUBLE

FUEL CIRCUIT

Clogged pipes *   *                  
Clogged fuel filter * * *     *            
Air inside fuel circuit * * * *   *            
Clogged tank breather hole * * *                  
Faulty fuel pump * *                    
Injector jammed *                      
Jammed injection pump delivery valve *                      
Wrong injector setting         *         *    
Excessive plunger blow-by *       *     *        
Jammed injection pump delivery control *   * *                
Wrong injection pump setting   * * * *              

LUBRICATION

Oil level too high       *   *     *      

Jammed pressure relief valve

            *          

Worn oil pump

            *          

Air inside oil suction pipe

            *          

Faulty pressure gauge of switch

            *          

Clogged oil suction pipe

            *          

ELECTRIC SYSTEM

Battery discharged *                      

Wrong or inefficient cable connection

*           *          

Defective ignition switch

*           *          

Defective starter motor

*           *          

MAINT-ENANCE

Clogged aif filter *   *   *       *      

Excessive idle operation

          *     *      

Incomplete running-in

          *     * *    

Engine overloaded

* * *   *         *    

SETTING/REPAIRS

Advanced injection *                      

Delayed injection

*

 

 

 

*

*

 

 

 

 

 

 

Incorrect governor linkage adjustment

*

 

 

*

 

 

 

 

 

 

 

 

Broken or loose governor spring

 

*

*

 

 

 

 

 

 

 

 

*

Idle speed too low

 

*

 

*

 

 

 

 

 

 

 

 

Worn or jammed piston rings

 

 

 

 

 

*

 

 

*

*

 

 

Worn or scored cylinders

 

 

 

 

 

*

 

 

*

*

 

 

Worn valve guides

 

 

 

 

 

*

 

 

*

*

 

 

Jammed valves

*

 

 

 

 

 

 

 

 

 

 

 

Worn bearings

 

 

 

 

 

 

*

 

 

 

 

 

Governor linkage not free to side

*

*

 

*

 

 

 

 

 

 

 

 

Drive shaft not free to slide

 

 

 

 

*

 

 

 

 

 

 

 

Damaged cylinder head gasket

*

 

 

 

 

 

 

 

 

 

 

 

Any leakage of engine oil

 

 

 

 

 

 

 

 

*

 

 

 

Oil seal leakage at gear side

 

 

 

 

 

 

 

 

*

 

 

 

Oil level too low

 

 

 

 

 

 

 

 

 

 

*

 

Warn facing plates

 

 

*

 

 

 

 

 

 

 

*

 

Loose governor screw

 

 

 

 

 

 

 

 

 

 

 

*

Tappet setting

 

 

 

*

 

 

 

 

 

 

*

 
 
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