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Irregularities in Operation, Causes and Remedies




Symptom: Cause: Remedy:
1. Starting difficulties.  
2. Insufficient or no compression. Inlet and exhaust valves leaking. Grind or replace valves, mill the seats  
3. Inlet and exhaust valves sticking. Oil the valve spindles with gas oil, or remove valves for cleaning
  Insufficient rocker arm clearance. Adjust valves
  Piston rings sticking in grooves, or worn. Loosen rings and replace them if necessary
  Valve springs broken or slack. Replace springs.
  Cylinder liner worn, Cylinder liner scratched. Replace. Replace.
Fuel valve out of order. Nozzle needle valve sticking or leaking, Release it, grind or replace if required.
Fuel pumps give no or insufficient pressure. Pressure valve sticking or leaking. Pressure valve holder loose. Piston and lining worn. Clean it, replace if required. Tighten Replace.
Insufficient or no fuel supply. Air in fuel system. Fuel lift pump defective. Ventilate Repair pump and ventilate fuel system.
Engine starts, but stops after a while Fuel tank empty. Fill tank and remove air from fuel system.
  Air in fuel system. Airate.
  Fuel filter choked. Clean the filter.
3. Engine does not reach maximum capacity    
Insufficient or no compression,     See under "Starting difficulties".
Fuel valves out of order.        
Excessive waste of Fuel pump plungers worn. Replace plungers and
oil from fuel pumps.     sleeves.
Engine takes load only momentarily. Fuel supply blocked, fuel pump out of order Check the whole fuel systei. thorouehlv.
Engine does not reach full speed. Governor drive broken. Adjust or replace governor spring,
Enftine loses too much speed under load. Incorrect adjustment of governor, or something in the system works sluggishly. Adjust governor. Check governor system, and correct the defect
Smell of heat. Insufficient cooling water. Stop engine, fill in cooling water when the engine has cooled off
4. Engine speed too high.      
Languid movements of governor arm. Governor arm has become oblique bv blows or the -like. Stop engine quickly by interrupting the fuel supply and check the governor system
Incorrect adjust­ment of governor.     Adjust governor
5. Engine knocks.      
Ignition too advanced. Incorrect adjustment of fuel oil pumps. Adjust correctly.
Mechanical faults. Connecting rod bolts loose. Check connecting rod bolts thoroughly. If cracked or defect, replace them. Tighten nuts.
Mechanical faults. Hot or worn bearings. Replace bearing lining,check lube oil system, correct fault if any before restarting.
  Flywheel loose. Tighten nut and lock it
  Worn pistons and linings. Replace them.
6. Engine smokes.      
Black smoke from engine. Air filter choked. Clean filter.
  Fuel valve out of order. See under "Starting difficulties".
  Insufficient compression.    
  Engine overloaded. Reduce load.Never overload.
  Thermostat valve leaking. Replace valve.
Black smoke from engine. Lube oil forces its way past leaky piston and oil rings into combustion chamber. Replace oil and piston rings.
7. Excessive fuel oil consumption.      
Engine runs hot Engine overloaded. Reduce load(never overload)
Insufficient compression,     See under "Starting difficulties".
Leaky fuel system, Fuel pipes leaking. Repair or replace,
    Fuel pump plungers and linings worn. Replace defective parts.
Increasing oil level. Fuel lift pump diaphragm defective, Replace diaphragm.
Engine smokes. Fuel valves out of order. Clean and adjust valves.
    Thermostat valve leaks. Replace valve.
8. Excessive lubricating oil consumption.      
Lube oil enters combustion chamber. and piston rings worn. Replace rings.
  Pistons and cylinder linings worn- Replace defective parts.
Lube oil teaks out of crank shaft end bearings. Oil seal rings and bearings worn. Replace seal rings and repair bearings.
9. Engine runs hot      
Smell of heat. No cooling water . Stop engine, fill up with cooling water when engine cooled off.
  Engine overloaded. Unload engine.
Cooling water temperature too high. Lack of cooling water owing to defective cooling water pump or escape of water from leakage. Remedy the fault.
Cooling water too high Defective thermostat. Replace thermostat
    Fan belt too loose Tighten belt.
  Radiator choked Clean radiator.
  Pressure vacuum valve out of order. Repair valve.
Lube oil pressure insufficient Lube oil filter choked. Clean filter.
    Lube oil pump defective. Repair pump.
    Lube oil pressure line leaks. Repair or replace line.
    Defective lube oil overflow valve, Repair valve.
10. Engine jars.      
Engine misfires. Air in fuel system. Ventilate. See under "Starting difficulties" and "Engine does not reach maximum capacity"
  Fuel valves out of order.  
11. Normal operation temperature is not reached.      
Too low a cooling water temperature. Thermostat defective. Replace thermostat.
  Air temperature too low. Cover radiator

 

 


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