When is an air filter 'Dirty'

Discussion in 'Engine' started by GlenQ, Jul 10, 2011.

  1. GlenQ

    GlenQ Active Member

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    Just checked my air filters. The filter box was full of dead flies. The filters themselves did not seem too bad just a little discoloured. How do you really know when it's time to change them:confused:
     
  2. Whitey

    Whitey Active Member

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    Good questions. I think they are just replaced in due course rather than being 'dirty'.

    I bet in other countries they have more reason to need to be changed - ie dusty climate.

    Chris
     
  3. davidjpowell

    davidjpowell MB Enthusiast

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    Moons ago I had a Renault Laguna II, which had been my company car from new.

    I had left the firm, but returned shortly afterwards. In between the car had been crashed. When it returned to me it also needed a service. After this fuel consumption was down by 5 mpg... Noticeable.

    Took the dealer 3 trips to spot an air filter full of 'cellulose'. Not sure why it had not been changed at the service in any case.

    A dirty fuel filter is going to use more fuel, or I imagine potentially 'strangle' an engine.
     
  4. wemorgan

    wemorgan MB Enthusiast

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    I've just replaced the air and cabin filter in my car. I think there's little argument mine needed doing.

    [​IMG]
    [​IMG]
     
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  5. Dieselman

    Dieselman Banned

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    The colour isn't a good indicator of blockage, really you need a manometer.
     
  6. Whitey

    Whitey Active Member

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    Not always practical on a domestic vehicle though ?!
     
  7. Number_Cruncher

    Number_Cruncher Active Member

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    A unit like this is used to monitor air filter efficiency on commercial vehicles;

    ebay item 200622486388

    Mercedes trucks used to have an indicator on the dashboard where a sensitive differentiual pressure gauge would reveal a red flag as the filter blocked. It probably wouldn't be too difficult to obtain one and use it - you could argue it would be a better use of dashboard space than the gimmicks usually found there.
     
  8. tim.100

    tim.100 Active Member

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    Some Land Rover Defender diesels had a visual gauge in the engine bay (on the air filter canister) in the 1990's Tdi 200 models.
     
  9. Dieselman

    Dieselman Banned

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    As do some Mercedes cars.
     
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