[Mgs] Fw: MGB oil filters and flow direction

frankk12 at verizon.net frankk12 at verizon.net
Sat Apr 13 09:24:13 MDT 2013


----- Original Message ----- 
From: <frankk12 at verizon.net>
To: "PaulHunt73" <paulhunt73 at virginmedia.com>
Sent: Saturday, April 13, 2013 11:19 AM
Subject: Re: [Mgs] MGB oil filters and flow direction


> Paul: I recently lost an entire crankcase of oil similar to what you 
> describe. Then I proceeded to lose another 5 quarts when I discovered that 
> the O ring from the  old filter had ahdered itself to the filter housing 
> and when I screwed the new filter on I had two O rings where there should 
> only have been one thus crating the oil leak. It was a costly lesson but 
> one I will never repeat. Check to make certain the old filter O ring  came 
> off with the old filter.
> Frank Krajewski
> ----- Original Message ----- 
> From: "PaulHunt73" <paulhunt73 at virginmedia.com>
> To: <mgs at autox.team.net>; <MG-MGB at yahoogroups.com>
> Sent: Saturday, April 13, 2013 10:39 AM
> Subject: [Mgs] MGB oil filters and flow direction
>
>
>> After 23 years of changing oil filters on this engine, three or four 
>> times in
>> the last few years there has been a problem in that the filter doesn't 
>> seem to
>> have sealed properly, and chucked out about a cup-full of oil at first 
>> start.
>> Oiled the new seal as usual, and the filter head was oily anyway.  This 
>> time
>> it didn't seal at all.  Started up twice and it gushed out.  Removed the
>> filter, everything looked OK.  Refitted tighter, tried again, gushed out
>> again.  Tried a new filter and this time it didn't leak, but oil pressure
>> didn't rise as it should.  Checked the dipstick and it was off the 
>> bottom,
>> having been up to Max before, i.e. chucked out a couple of litres or more
>> previously.  Refilled and this time it was OK.  These are Mann filters, 
>> with a
>> bypass valve as well as an anti-drainback valve.
>>
>> What's the direction?  I thought it came from the pump out of the back of 
>> the
>> block past the oil gauge tapping, through the cooler, into the filter 
>> head
>> (inverted replaceable cartridge type in my case), up the outside of the
>> filter, then down through the middle and into the block for the bearings.
>> This is what Haynes and the Workshop Manual appear to show.
>>
>> The curious thing is that immediately before oil started gushing out 
>> there was
>> a sort of squeal from the direction of the filter, as if there was high
>> pressure somewhere, but almost nothing was shown on the gauge.  If there 
>> was
>> something wrong with the filter such that it wasn't passing oil i.e. both 
>> the
>> filter was blocked and the bypass failed, surely that should have shown 
>> on the
>> gauge if that's between the pump and the filter?  And if the filter was
>> flowing oil (the middle had plenty in as normal when I took the first
>> replacement off, and the anti-drainback tube on the filter head) why was 
>> so
>> much pressure apparently developing to blow the seal?
>>
>> PaulH.
>> _______________________________________________


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