This seems a hard little bugger to find much info on.

Not having an extra one, I sprayed it off with brake cleaner and resused it on the previous oil change.

Is it to be replaced each time or after X # of oil changes?

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1974 240D "Boldie" 170K.- New timing chain/freshly rebuilt IP/replaced valve seals/injectors/upgraded stereo/new Bilsteins with Yokohamas/fresh paint and rocker panels plus lots of welds.

it supposed to be cleaned each time and only replaced if the screen is broken

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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg

Many thanks.

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1974 240D "Boldie" 170K.- New timing chain/freshly rebuilt IP/replaced valve seals/injectors/upgraded stereo/new Bilsteins with Yokohamas/fresh paint and rocker panels plus lots of welds.

And it is not the pre-filter, but the main oil filter. Be careful not to get dirt on the inside.

Thanks.

For anyone searching in the future, which side of these Knecht filters faces up, towards the hood? I'm inclined to say Side A, but don't want to steer anyone wrong.

Side A






Side B





Consequences for being wrong?

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1974 240D "Boldie" 170K.- New timing chain/freshly rebuilt IP/replaced valve seals/injectors/upgraded stereo/new Bilsteins with Yokohamas/fresh paint and rocker panels plus lots of welds.

I know only a slightly different version. The open side must be at the top, the oil streams back into the engine via the opening.

Entire assembly:



Open side



Closed side



So I think side A.

Consequences: no oil filtering or no oil delivered to vital points.

Thanks, again!

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1974 240D "Boldie" 170K.- New timing chain/freshly rebuilt IP/replaced valve seals/injectors/upgraded stereo/new Bilsteins with Yokohamas/fresh paint and rocker panels plus lots of welds.