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mf40 oil bath air filter setting up instructions please

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tony vobe

09-15-2007 10:36:53




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finally got round to re doing my air filter assembly after removing it all as it was rusted split and full of water when purchased(fitted a k+n type temporarily). according to a few people the mf40 u.k had a dry assembly. mine has an oil bath which is better? if i purchase a new one

please see ebay item number 220134107468

firstly will it fit in the clamp i have to mount it
and what do i do to service it? clean and oil etc i dont have a clue on these filters

thanks for any help

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Gerald J.

09-16-2007 08:05:21




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 Re: mf40 oil bath air filter setting up instructions please in reply to tony vobe, 09-15-2007 10:36:53  
In dirty operating conditions, the dry type filter needs service at least once a day, else it chokes the engine. The K&N filter is not much of a filter, it stops humming birds, but not bees. Its not a safe filter in dirty conditions.

Gerald J.



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tony vobe

09-16-2007 02:08:04




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 Re: mf40 oil bath air filter setting up instructions please in reply to Chuck Bergstrom, 09-15-2007 10:36:53  
thanks

seems like checking every day is a pain in the backside. i will see if i can get a dry canister to replace it with.



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135 Fan

09-15-2007 22:35:18




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 Re: mf40 oil bath air filter setting up instructions please in reply to tony vobe, 09-15-2007 10:36:53  
My 135 has an oil bath that works fine but a dry element is less hassle. The only thing you have to worry about with a dry element is that if the filter is really dusty, dirt doesn't get into the intake when you take the filter off. Most dry element filters can have a smaller safety filter inside that usually doesn't need to be replaced very often because the main filter will catch all the dirt. The safety inner filter will stop any dust getting into the intake when you take the outer filter off for cleaning or replacement. A dry filter can be mounted vertically or horizontal as needed. Make sure to check what it's designed for. I think a dry filter has the most effective filtering but have never heard of problems with a proper oil bath filter. Dave

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Jerry/MT

09-15-2007 12:18:32




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 Re: mf40 oil bath air filter setting up instructions please in reply to tony vobe, 09-15-2007 10:36:53  
There are at least two methods used to filter air in an oil bath air filter. The first is to turn the air 180o just above the oil cup at the bottom. The bigger particles are centrifuged out in the turning process and end up in the oil cup. The second method is that the airflow also pulls oil droplets up into the metal mesh (but not into the engine unless you use too light an oil). That oil traps the finer particles and when you shut down, it drains off the mesh and deposits the particles in the oil cup. So you need to check and replace the oil daily in very dusty conditions or at least check the cup to see if there is a lot of dirt in there. This is a usually neglected check and most old oil bath filters are literally coated in a oil-dirt mixture that takes a soaking in diesel or lacquer thinner to remove.

To service it, check it regularly; every day in really dirty conditions. If it need replacement, pour off the oil and clean out the cup. Replace the oil with clean oil as specified in the owners manual. It's usually 30W oil and it doesn't have to be some expensive oil. The cheapest 30W will do. I get my oil bath oil at Walmart

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