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Re: [Mgs] oil filter

To: "Paul Hunt" <paul.hunt1@blueyonder.co.uk>, "Bernie Grabow"
Subject: Re: [Mgs] oil filter
From: Barrie Robinson <barrie@look.ca>
Date: Wed, 16 Dec 2009 13:45:34 -0500
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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