Comments on: What is the law in mot’s regarding diesel cars of pre 1979 vintage? http://london-lez.org/diesel-cars/what-is-the-law-in-mots-regarding-diesel-cars-of-pre-1979-vintage Sat, 19 May 2012 16:59:11 +0000 http://wordpress.org/?v=2.7 hourly 1 By: Bandit600 http://london-lez.org/diesel-cars/what-is-the-law-in-mots-regarding-diesel-cars-of-pre-1979-vintage/comment-page-1#comment-4090 Bandit600 Sat, 14 Nov 2009 03:34:59 +0000 http://london-lez.org/diesel-cars/what-is-the-law-in-mots-regarding-diesel-cars-of-pre-1979-vintage#comment-4090 Yes, it's just a visual test.<br><b>References : </b><br>Mot tester. Yes, it’s just a visual test.
References :
Mot tester.

]]> By: m_13 http://london-lez.org/diesel-cars/what-is-the-law-in-mots-regarding-diesel-cars-of-pre-1979-vintage/comment-page-1#comment-4089 m_13 Sat, 14 Nov 2009 03:04:59 +0000 http://london-lez.org/diesel-cars/what-is-the-law-in-mots-regarding-diesel-cars-of-pre-1979-vintage#comment-4089 The only emission test applicable to Diesel engines is the measuring of exhaust smoke density. The test involves accelerating the engine several times to its maximum unloaded speed. Note: it is of the utmost importance that the engine timing belt is in good condition before the test is carried out. The limits for Diesel engine exhaust smoke, introduced in September 1995 are: Vehicles first used before 1st August 1979: Exempt from metered smoke testing, but must not emit "dense blue or clearly visible black smoke for a period of more than 5 seconds at idle" or "dense blue or clearly visible black smoke during acceleration which would obscure the view of other road users". Non-turbocharged vehicles first used after 1st August 1979: 2.5m-1 Turbocharged vehicles first used after 1st August 1979: 3.0m-1 Excessive smoke can be caused by a dirty air cleaner element. Otherwise, professional advice may be needed to find the cause.<br><b>References : </b><br>http://www.haynes.co.uk/webapp/wcs/stores/servlet/Feature_MOTView?langid=-1&storeId=10001&catalogId=10001#checks21to25 The only emission test applicable to Diesel engines is the measuring of exhaust smoke density. The test involves accelerating the engine several times to its maximum unloaded speed. Note: it is of the utmost importance that the engine timing belt is in good condition before the test is carried out.
The limits for Diesel engine exhaust smoke, introduced in September 1995 are:
Vehicles first used before 1st August 1979: Exempt from metered smoke testing, but must not emit "dense blue or clearly visible black smoke for a period of more than 5 seconds at idle" or "dense blue or clearly visible black smoke during acceleration which would obscure the view of other road users".
Non-turbocharged vehicles first used after 1st August 1979: 2.5m-1
Turbocharged vehicles first used after 1st August 1979: 3.0m-1

Excessive smoke can be caused by a dirty air cleaner element. Otherwise, professional advice may be needed to find the cause.
References :
http://www.haynes.co.uk/webapp/wcs/stores/servlet/Feature_MOTView?langid=-1&storeId=10001&catalogId=10001#checks21to25

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