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Causes of Engine Starting & Running Faults With Remedies

October 20, 2018 by Dr. IM Leave a Comment

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Causes of Engine Starting & Running Faults With Remedies:-

If the engine is maintained as per the instructions given in the earlier sections of this booklet, normally there will be no trouble. However, if a fault occurs, the following table would help the engine user to remove the faults of elementary nature and keep the idle time of the engine to minimum. If even after attending to the engine as per the following instructions, the working is still unsatisfactory, it is advisable that our nearest authorized dealer/distributor be consulted.

Fault

–            Cause

Remedy

Dirty/clogged air cleaner. Clean air cleaner, change oil in air cleaner.
High exhaust back pressure. Clean exhaust silencer and manifold
Fuel tank empty Fill up tank and air vent
Fuel tank cock closed Open the cock and air- vent if necessary
Air in fuel line Bleed fuel system
Strainer in feed pump Clean the strainer
inlet banjo bolt choked
Engine fails Fuel line leaking Check all fuel line connections for tightness,
to start change copper washers.
Faulty fuel injection nozzle Check the nozzle spray, if necessary change the nozzle
Dirty/choked fuel filter Change the filter elements and clean fuel
filter bowls.
Feed pump not working Operate feed pump, if not working, send it
to your dealer.
Wrong adjustment of  valve Re-adjust the valve clearances correctly.
clearance
Incorrect fuel timing Set to correct fuel timing.
Battery runs down Recharge battery
Battery of wrong capacity Use battery of correct  capacity
 

Faulty starter

recommended in Maintenance manual.

Repair starter

Loose or dislodged wiring Tighten all loose wiring

 

High exhaust back pressure Clean exhaust silencer and manifold
Dirty/Clogged air cleaner Clean air cleaner, change oil in air cleaner
Air in fuel line Bleed fuel system
 Engine difficult to start Fuel line leaking Check all fuel line connections for tightness change copper washers
Faulty fuel injection nozzle Check the nozzle spray, if necessary change the nozzle
Engine used after a long time Flush and service engine thoroughly
     Incorrect fuel timing Set it to correct fuel timing

 

Fault

Cause

Remedy

Run down battery, terminals loose or oxidized causing starter motor to turn slowly. Have battery inspected, clean terminals, tighten and coat with acid-free grease.
Grade of lub. oil used is too viscous

(applies particularly at very low temp. in winter)

Use correct grade of lub. oil as Recommended(in lub. Oil Specifications)
Fuel supply not sufficient Renew fuel filter and then air-vent, clean strainer in fuel lift pump
Engine starts                 but stops after some time

but stops

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after

some time

Dirty/Clogged air cleaner Clean air cleaner, change oil in
air cleaner
No fuel Replenish with clean fuel
Air in fuel line Bleed fuel system, tighten all fuel
connections
Choked fuel injector holes Clean holes
Dirty/Choked fuel filter Clean fuel filter bowls and
replace the fuel filter elements
Water mixed with fuel Change fuel and clean fuel tank
Wrong adjustment of valve clearance Re-adjust valve clearances correctly
Engine seized Contact nearest distributor
One or more cylinders not working Contact nearest distributor
Engine gives Dirty/clogged air cleaner
Clean air cleaner, refill lub. oil in air cleaner
poor
High exhaust back pressure Clean exhaust silencer and manifold
 performance Or engine De-rating due to altitude And temperature Calculate de-rating due to altitude and  temperature and Put correct load on engine
Lacks power Choked fuel injector holes or nozzle needle sticking Clean injector and fuel line, Have inspected by a specialist
Control lever setting wrong Adjust to correct setting
Faulty fuel pump Send pump for recalibration
Fuel supply not sufficient Renew fuel filter elements and air-vent, clean strainer in fuel lift pump, tighten fuel line connections
Overflow valve on fuel Have inspected by a specialist
injection pump not working properly

 

        Fault

Cause

                Remedy

Engine gives poor performance or engine lacks power Valve clearance out of adjustment, valve spring broken Re-adjust valve clearance, renew valve spring.
Dirty air cooling fins on cylinder heads    Clean air fins
Loose fan belt Tighten belts
Valve leakages Regrind the valves
Broken/seized/worn out piston rings Replace with new piston rings
Worn out liner and piston Replace with new one
Damaged main and connecting rod bearings Change bearings
Incorrect valve and fuel timings Set to correct settings
Faulty governor setting Set governor properly
One or more cylinders not working Contact nearest distributor
Exhaust smokes badly Too much oil in sump Drain off until level reaches low mark on dipstick
Oil level in oil bath air cleaner too high Pour off until level agrees with mark hole
Inefficient compression due to sticking or broken compression rings or incorrect valve clearance Have compression rings and pistons inspected by a specialist, readjust valve clearance
De-rating due to altitude and temperature Calculate de-rating due to altitude and temperature and reduce load on the engine if necessary
Poor quality of fuel Change to quality fuel
Engine overheats

(shut down engine

Immediately)

Cooling fins on cylinders and cylinder heads, very dirty Clean cooling fins, particularly the vertical ones on the cylinder heads
Injectors defective Have inspected by a specialist
Injection pump delivery out of Have adjusted by a specialist
adjustment
Insufficient cooling air input to blower Ensure the cooling air flow
Blower V-belt broken Renew V-belt

 

        FAULT              CAUSE                 REMEDY
Engine oil

pressure too low

(shut down engine

immediately

Wrong grade of lub oil used

Dirty/choked suction tube strainer Dirty/clogged oil filter

Use lub. oil of recommended grade

Clean strainer thoroughly

Clean oil filter and replace filter element by new one

Engine oil pressure too low (shut down engine immediately) Clogged oil passages

Defective relief valve in lub. oil filter

Leaks in lub. oil system

 

Faulty oil pump

Engine oil not changed at recommended period

Excessive play on main bearing

Flush oil passages

Replace with new one

 

Check connections on pump, lines, filter, pressure gauge and cooler for tightness

Replace with new one

Change the oil

 

Change bearings, consult specialist

Battery runs down frequently Faulty starter

Faulty generator

Faulty cut-out

 

Loose wiring

Repair starter

Repair generator

Clean the contact points, if necessary replace it

Tighten all loose wiring

 

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Filed Under: Technical Articles Tagged With: Cause, Causes of Engine Starting & Running Faults With Remedies, Engine gives poor performance, engine lacks power, Engine overheats, Engine starts but stops after some time, Exhaust smokes badly, Fault, Remedy

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