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MG MGB Technical - MOT Failed

Just put the B in for its MOT. failed on brakes, already ordered the parts. Also failed on emmission HC level at 1800 should be 1200, depressed!
A Charman

Hi Andrew, What year?

Peter
peter burgess

1977.
A Charman

Is there a hydrocarbon limit for that year? If so It was the case that, if the co level is acceptable at idle, the hydrocarbons can be checked at higher rpm (cannot remember but think around 2500) and if less than 1200 a pass is given.This was mainly introduced for Metros .

Peter
peter burgess

B. Vehicles first used on or after 1 August 1975

1. Check that the analyser probe can be inserted into the tailpipe.

2. Use a suitable exhaust gas analyser to
determine the proportions of carbon monoxide {CO) and hydrocarbons (HC in the exhaust gas over a period of at least 5 seconds at idle.

Note: Any residual hydrocarbons (ie those indicated by the analyser when it is sampling only clean airj should be deducted from the HC reading obtained from the vehicle.

Note: If a vehicle meets the CO requirement at its normal idling speed but fails the HC check, re-check the HC level at a high idle speed of 2000rpm. If the HC reading is 1200 ppm or less, the vehicle will meet both the CO and HC requirements.
. the CO requirement must be met with the engine running at its normal (low) idling speed
. do not use a cold start/cold running mechanism to achieve a high idle speed. Instead, apply light pressure to the throttle pedal.

See here http://www.motuk.co.uk/manual_730.htm
GeoffE

MOT now passed, another 11 months of trouble free running, mut must try an improve the brakes.
A Charman

This thread was discussed between 02/06/2009 and 11/06/2009

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