Checking exhaust smoke using opacimeter

Checking exhaust smoke using opacimeter

Start up vehicle engine and allow to warm up to service temperature (radiator cooling fan comes on twice).

Position opacimeter measurement unit firmly near the vehicle exhaust pipe (place opacimeter fume exhaust down wind)

Connect hose of measurement unit to vehicle exhaust pipe.

Connect and adjust equipment as instructed by the Manufacturer.

Pump accelerator pedal three times quickly to the floor until rpm limiter threshold speed is reached.

Carry out measurements over five successive full accelerator pedal pumps.

Note maximum values achieved.

Take the arithmetic mean of the three closest readings to obtain the test result.

If more than one set of three readings is suitable, choose the one with the highest mean.

If exhaust smoke level exceeds 70%, carry out the tests desribed overleaf.