I remember this site from some time back. I thought the chap had
been warned off by one of the big daddies. So is the old one of way
back - or is it being updated? I don't see any date on it - mind you
I don't see very well anyway !!!
At 04:00 AM 12/16/2009, Paul Hunt wrote:
>It's an anti drain-back tube. Together with the anti drain-back
>valves that should be in spin-on filters it prevents oil draining
>out of the filter when switched off, which would otherwise happen
>with an inverted filter, leading to longer times to get pressure
>when restarting. However the valves in filters can be very variable
>in construction and quality, and poor ones will allow the oil to
>drain out more as the filter gets older, and some can be pretty-well
>ineffective from day one, see
>http://people.msoe.edu/~yoderw/oilfilterstudy/oilfilterstudy.html.
>Volvo 3517857-3/Mann W917 seem to retain the oil for their lifetime
>(3k miles in my cars), better than the Unipart/Champion/Halfords
>typically available in the UK which tend to tail off albeit it about
>50% dearer. Some Fram filters are reputed to be good but one I
>tried from a well known supplier in the UK were noticeably
>worse. K&N Gold seemed as good as the Volvo/Mann but are harder to
>get hold off and twice the price. One thing to be aware of is to
>make sure your filter is at least an inch longer than the tube, some
>filters that fit the thread are so short they tighten down onto the
>end of the tube which prevents oil pressure developing.
>
>PaulH.
>
>----- Original Message -----
>>... I see a small
>>metal tube about 4 inches long that is press fitted into the threaded
>>hole that the oil filter element screws down onto with the metal tube
>>fitting up into the oil filter. What is the purpose of this tube...
>
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Regards
Barrie
(705) 721-9060
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