| 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
|
