Quote:
Originally Posted by oldgun
Managed to get the job don, took 3 hours with heat gun.
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Quote:
Originally Posted by AlanM
The internal filter is on the suction side of the oil pump so restrictions here could quite possibly impact on the operation.
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Hi Guys,
Just wondering how you have got on since changing your primary filters? Any problems, or worked a treat?
The reason I ask is that I've pulled my filter out and carefully disassembled it. These filters are very cheap and nasty internally. They appear to be seriously designed to fail.
I'm concerned that the process of heating, softening and bending the top downwards during installation will end up damaging the filter, effectively destroying it.
The membrane in mine is not actually paper, it's like some kind of non-woven fabric, kind of like face mask material. No complaint about that. My filter was made by Filtran, who specialise in this type of filter. They have a patent material called "V Pore", which seems fairly effective for filtering high flow-rate oil / transfluid.
The first problem is that the membrane is installed basically flat, and is simply crimped into the edge seam between the metal base and the plastic top. That would be okay if it was supported adequately internally, but it isn't.
The real problem is that there is a series of "supporting" ribs moulded into the inside of the plastic top, but these ribs are not continuous, they are segmented. The gaps between ribs and segments are quite large, so that as the filter clogs up, it gets sucked down (ok, up) into the gaps between the ribs. Imagine a powerline running across the countryside on poles. It dips down between each pair of poles. So, a membrane which starts out flat ends up becoming a series of dips and peaks.
Effectively, this stretches a membrane which started out flat. Of course, it doesn't appear to be elastic or stretchy, so basically, it's put under tension, and that tension is retrained around the edge seam - which is where it fails. In mine, a section of the membrane has pulled out of the seam, with obvious consequences. This is how plastic bits get into the mechatronics, I'm in no doubt about that now.
My concern is that when heating and softening the plastic top and pushing it down to get the spigot into the pump throat, you're doing exactly the same thing - pushing the ribs down against the membrane and stretching it. Possibly to the point of pulling some of it out of the edge seam.
I do have a bunch of photos to post, but no time at present.
Anyway, I'm very keen to hear if your filter replacements have been successful.