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BLACK SMOKE EMISSION AND ENGINE MAINTENANCE


LAW APPROPRIATE 

Under Procedure
3(I) MOTOR VEHICLES (Control of Smoke And Gas Emission) Rules P.U.(A) 414/1977 under Section 57 Road Transport Act 1987 equable :

No body can use or effectuate to use a motor vehicle which smoke emission more than 50 HSU".

If found guilty, can be fined not exceeding RM500 and imprisoned no exceeding 2 weeks for the first time, can be fined not exceeding RM1,000 and imprisoned not exceeding one month for the next time.

 

SMOKE EMISSION OF DIESEL VEHICLES

  1. Exhaust black smoke emitted from a diesel engine is carbon formed during the combustion in the form of soot.

  2. Possible causes for a diesel engine to emit excessive black smoke are :

    • Faulty injectors.

    • Restricted air intake.

    • Early or late injection timing.

    • Over fueling.

    • Wrong fuel.

    • Excessive exhaust back pressure.

    • Intake air too hot.

    • Under load - low compression.

    • Engine operating below engine operating temperature.

    • Faulty turbo charger.

  3. Remedies to reduce diesel engine black smoke emission :

    • Clean, repair or replace injectors.

    • Service or replace air filter if it is excessively clogged. Check piping/ducting and connections for obstruction and leakage.

    • Set injection pump timing to engine manufacturer's specification.

    • Set/calibrate injection pump and injectors to engine manufacturer's specification.

    • Ensure correct grade and catena rating of the fuel being used as per vehicle manufacturer's recommendation.

    • Check exhaust system for restriction, carbon built-up, etc.

    • Ensure location of air intake is not under high temperatures.

    • Ensure engine compression pressure is within vehicle manufacturer's specification. This helps checking for gasket leaks, correct valve adjust or leaks, worn out piston and piston rings.

    • Check for correct opening temperature of engine thermostat.

    • Check turbocharger for damage (insufficient boost pressure).

  4. Vehicle service maintenance

    • Carry out service and maintenance interval as per vehicle manufacturer's recommendation.

    • Maintain air intake filter system correctly by using approved air filters, and ensure that there is no obstruction and leakage of air intake ducting.

    • Use grade of engine oil as approved by the vehicle's manufacturer.

    • Change fuel filters at interval recommended by the vehicle's manufacturer.

    • Adjust engine valve clearance at intervals recommended by the vehicle's manufacturer.

    • Remove injectors, check for leakage, carbon built-up, and clean fuel delivery pump as per vehicle manufacturer's recommendation.

    • For engine fitted with turbocharger, best maintenance is to observe instruction of starting and stopping the engine as per vehicle manufacturer's recommendation.

    • Check exhaust system for corrosion and obstruction.