View single post by atgparker
 Posted: 12-08-2013 02:35 pm
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atgparker



Joined: 06-23-2013
Location: Mission Viejo, California USA
Posts: 90
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 In many of the forum-threads the oil filter type seal which keeps the adapter fixed to the auxiliary housing can be a source for leaking. And it seems many are inclined to replace this seal with the oil filter or at least every other filter change. Well Professional Products makes these PFS-10857 filters with a serviceable 25 micron stainless steel screen. There is a magnet in the cover and they are without any bypass valve so all the oil gets filtered all the time.

But aside from the filters internals which do not have a drain back valve the neat part is that you can fix the base of this filter to the oil cooler adapter with the Power Filters integral O-ring seal so that the other seal on the oil cooler adapter can be kept properly compressed "forever". As the Power Filters O-ring seal allows the filters housings base to compress the O-ring in the O-rings groove and then the bases surface goes metal to metal with the oil cooler adapter's surface. This in turn then allows the compression of the adapter to the auxiliary housing seal to be properly compressed to prevent shifting of the adapter where the influence of the oil lines flexing from engine rock could cause an upsetting of the square seals used with the auxiliary housing and a conventional oil filter.

The outer cover of the Power Filter unthreads from its base so you can service the filters screen and see how much steel is on the magnet! It is a bit tight with the starter motor but if your cleaver you can figure out how to get this apart and together so as to re seat the filters element back in the base and the outer housing cover of the Power Filters construction. But the base stays in place while servicing the filer element which keeps the oil cooler adapter fixed and leak free because your not upsetting the compression on the seals. In addition the oil cooler adapter is better able to maintain its radial position because it is not sandwiched between a pair of relatively tall square cross section O-ring gaskets. Which begs the question to ask how much would one turn the filter after the pair of square O-rings have lightly seated when using a conventional oil filter, 3/4 turn 1-1/2 turn?

In the Power Filter's base the oil passage ways are wonderful huge conical shaped slots, not crappy little holes, so as all of your oil goes through the 25 micron screen all the time. Professional Products offer tighter micron filtration elements for race engines. It is important to make sure you clean this 25 micron filter element in hot soapy water at oil change intervals as you sort through the mayhem left behind from previous ownership.

With 11602 in less than 500 miles I have managed to collect all of the Permatex aviation gasket sealant from the inside of the engine that would get past the oil pickup screen that seemed to live in the sump? Which dam near clogged up the screen completely in my new Power Filter. So the "good news" is that if something goes south its going to get caught in this filters screen and what is more all of it is going to be trapped after the oil pump has sent it through this Power Filter!

Now lets hear the debate on the pros and cons about anti drain back valves in an oil filter on the 907!

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