----- Original Message -----
From: <frankk12@verizon.net>
To: "PaulHunt73" <paulhunt73@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@virginmedia.com>
> To: <mgs@autox.team.net>; <MG-MGB@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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