Is my air filter actually doing anything??

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LEON_BARKER

Member
Posts
48
Location
Kent
1988 Defender 90 w/ 200tdi.

Hi All,

So i after changing my oil, oil filter and fuel filter today I decided to have a look at the state of my air filter.

I took it out and it all looked in very clean condition. When i put it back in I realized that it doesnt actually fully fill the housing. It's as if it's not tall enough. So instead of air going though the filter and then down the middle. It just goes down the sides and underneath. The filter has a rubber seal on the bottom which I guess is ment to be pressed up against the bottom of the housing when the bolt is tightened, but the bolt fully tightens before the filter is against the base.

Let me know if I'm being stupid, or if whoever I brought this from 12 months ago made an error.

I've attached a couple of pics also.

Ta

20190421_151151.jpg
20190421_151155.jpg
 
Dis you screw the filter down onto that threaded stud then put the housing lid on top and screw that down?

Your meant to screw the filter down tight into the mount in the middle then put the lid on, hat way the air comes in and has no choice but to go through the filter then put the bottom to the engine
 
@flat that's exactly what I did, but it seems like the filter isn't tall enough to reach the bottom. Therefore leaving a gap for air to just go arround the bottom.
 
Mine, just pushes onto the threaded section, then you tighten the cap onto it which compresses the rubber section, BUT I did have to add a few extra washers onto the the threads between the tower and the cap to allow for the compression of the filter when the cap got tightened.

Cheers
 
Disco and defender air filters are different iirc?
I also recall there are 2 types of disco filter but I might be imagining that. :rolleyes:
 
Update:

I've measured the depth of the filter hhousing and the depth of the filter that has been in since I brought the landy 12 months ago, its apparent that the filter hasn't been going all the way to the bottom.

So I'm guessing the engine has been getting unfiltered air this whole time. Oops

20190422_141543.jpg
20190422_141614.jpg
 
LEON_BARKER said:
Update:

I've measured the depth of the filter hhousing and the depth of the filter that has been in since I brought the landy 12 months ago, its apparent that the filter hasn't been going all the way to the bottom.

So I'm guessing the engine has been getting unfiltered air this whole time. Oops

View attachment 176102 View attachment 176103
Click to expand...

Just checked a few filters in the garage, seems they are about 280mm approx outside , not including the rubber seal and 265mm approx inside allowing for the stepped back end, again not including the seal.

Looks like you have a dodgy filter there.

Cheers
 
Retroanaconda said:
300 version is shorter.
Click to expand...

Are you sure? I buy 300tdi service kits and the filter is the long version as measured in my post above, and I have what I beleive is a 200tdi filter with the plastic shroud over the rear end of it and that is the same length as the unshrouded one.

Cheers
 
I thought those short ones came out of 300Tdis but looking on google perhaps not. I got supplied one in error by a motor factors once and it was labelled as for a 300Tdi Defender. Perhaps there is another application which uses the same design but a shorter cartridge.

Either way its too short. The proper part for a 200Tdi is NTC6660. They’re cheap either genuine or from a reputable brand (e.g. Mahle).

This all assumes the OP is using the proper 200Tdi filter housing of course, given that it’s a converted vehicle.
 
It’s definitely not the original air filter housing, my standard ‘87 110 with na engine has the air filter fitted into the lid of the housing. Air to the engine comes out the top. Maybe you have a mix up as suggested above
 
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