What is the law in mot’s regarding diesel cars of pre 1979 vintage?
Posted on November 13th, 2009 by admin
I am under the impression that cars of this age are not emission tested. It is just a visual test.
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.
November 13th, 2009 at 10:04 pm
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
November 13th, 2009 at 10:34 pm
Yes, it’s just a visual test.
References :
Mot tester.