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michael vass
Grand Master
Username: mikebentleyturbo2

Post Number: 413
Registered: 7-2015
Posted on Monday, 04 December, 2017 - 03:32 am:   Edit PostDelete PostView Post/Check IP

Hi All
I want to change my gearbox oil and filter but when I look at various pics of the filters some look empty and some you can see filter material through the hole. See pics)
Any guidence on which brand to buy? there seems loads on offer.
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David Gore
Moderator
Username: david_gore

Post Number: 2758
Registered: 4-2003
Posted on Monday, 04 December, 2017 - 07:59 am:   Edit PostDelete PostView Post/Check IP

I used a FRAM TH400 filter kit purchased from Summit Racing [USA] for DRH14434 - note this kit includes the important O ring for the top of the modulator pipe from the filter [this must be replaced at the same time as the filter as a failed O-ring allows air to be sucked in causing erratic gear changes]:

https://www.summitracing.com/int/parts/frm-ft1020a

kit

.
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michael vass
Grand Master
Username: mikebentleyturbo2

Post Number: 414
Registered: 7-2015
Posted on Monday, 04 December, 2017 - 08:36 am:   Edit PostDelete PostView Post/Check IP

Thanks David but that is one that looks empty, was there anything in it?
Cheers Mike
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David Gore
Moderator
Username: david_gore

Post Number: 2759
Registered: 4-2003
Posted on Monday, 04 December, 2017 - 03:50 pm:   Edit PostDelete PostView Post/Check IP

Yes, I believe the gap you can see is a fluid gallery to act as a sump to ensure 100% fluid flow through the transmission valve bodies with no aeration.

Fram are well-respected filter manufacturers with many years of experience and are known for their quality products.
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Paul Yorke
Grand Master
Username: paul_yorke

Post Number: 1964
Registered: 6-2006
Posted on Monday, 04 December, 2017 - 06:12 pm:   Edit PostDelete PostView Post/Check IP

Both have filters in.

The visible one - fluid it's on top of the fabric and is sucked downwards through the fabric.

The empty looking one - fluid flows under the fabric and is sucked up through the fabric.

I think the theory is that crap will settle on the fabric on the visible type and settle on the metal on the other type.

Both do the same job.

Pickup o"ring is imperative.

Get a dip stick o'ring if sump entry type.

Check your selector shaft seal is not leaking before you start.

Messy old job. Enjoy :-)
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michael vass
Grand Master
Username: mikebentleyturbo2

Post Number: 415
Registered: 7-2015
Posted on Monday, 04 December, 2017 - 07:06 pm:   Edit PostDelete PostView Post/Check IP

Thanks guys
I'll order one then.
And I'll check the shaft for leaks before I start too.
Cheers
Mike
ps will a gallon be enough?
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michael vass
Grand Master
Username: mikebentleyturbo2

Post Number: 416
Registered: 7-2015
Posted on Tuesday, 05 December, 2017 - 09:54 pm:   Edit PostDelete PostView Post/Check IP

Hi All
Got the fluid ,filter and gasket but unfortunaley no O rings, any idea of part numbers for just the O rings please?
Cheers
Mike
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michael vass
Grand Master
Username: mikebentleyturbo2

Post Number: 417
Registered: 7-2015
Posted on Wednesday, 06 December, 2017 - 03:56 am:   Edit PostDelete PostView Post/Check IP

Hi all found a part number 1363951 , but 5 for an o ring! Is it anything special?
Cheers
Mike
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richard george yeaman
Grand Master
Username: richyrich

Post Number: 885
Registered: 4-2012
Posted on Wednesday, 06 December, 2017 - 08:59 am:   Edit PostDelete PostView Post/Check IP

Hi Michael in the grand scheme of things 5 buys you peace of mind, good luck.

Richard.
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Maxwell Heazlewood
Prolific User
Username: tasbent

Post Number: 120
Registered: 9-2017
Posted on Wednesday, 06 December, 2017 - 11:44 am:   Edit PostDelete PostView Post/Check IP

Michael...that is patently ridiculous!
Go to your local bearing and seals place and match up a modern Viton rubber seal.
The seals on offer, you don't know how long they have been sitting on the shelf and how old they are.
Just my thoughts....I have always had success at
matching up seals with a good guy behind the counter who knows his onions
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Paul Yorke
Grand Master
Username: paul_yorke

Post Number: 1967
Registered: 6-2006
Posted on Wednesday, 06 December, 2017 - 06:50 pm:   Edit PostDelete PostView Post/Check IP

It is 150% important that the suction tube is completely and fully sealed and tight or the gearbox will suck in air and will be ruined very quickly indeed.

The filter should be able to hang without the bolt holding it up.

Is that price from who you bought the filter off?

Never match to an old o'ring because there is no way of telling how deformed it is.
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Mark Aldridge
Grand Master
Username: mark_aldridge

Post Number: 482
Registered: 10-2008
Posted on Wednesday, 06 December, 2017 - 07:09 pm:   Edit PostDelete PostView Post/Check IP

Given that this filter is a long service item , 24k miles , why not use the genuine Bentley part. I guess that most owners probably do less than 10k miles per year.I change the filters at 24k miles, but the ATF every year or 10k miles whichever comes first.
Mark
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Maxwell Heazlewood
Prolific User
Username: tasbent

Post Number: 121
Registered: 9-2017
Posted on Wednesday, 06 December, 2017 - 10:32 pm:   Edit PostDelete PostView Post/Check IP

far be it for me to rain on anyone's parade but it is not a unique part.
Any seal specialist worth his salt can tell the difference between a new 'O' ring and one that has been in service for a few years....easy enough to match and you buy them for cents rather that inflated dollars/pounds...common sense will prevail.
Making sure as Paul so rightly says, that the filter is a solid push fit.
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richard george yeaman
Grand Master
Username: richyrich

Post Number: 886
Registered: 4-2012
Posted on Wednesday, 06 December, 2017 - 10:55 pm:   Edit PostDelete PostView Post/Check IP

Given the time involved in going to the seal and bearing shop one errand to buy an O ring in my view is false economy, and as Paul said if it sucks air that the box could be destroyed, is it worth it,

Richard.
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michael vass
Grand Master
Username: mikebentleyturbo2

Post Number: 418
Registered: 7-2015
Posted on Thursday, 07 December, 2017 - 03:27 am:   Edit PostDelete PostView Post/Check IP

Hi All
Thanks for all your advice and opinions.
I know what you mean Paul, I have heard of people putting 2 O rings on to make sure, don't know if you've heard of that?
Mark sorry it's not a RR/B box it's a GM box so the part number is a GM number even on the RR/B parts list.
This is why I think a GM part will be better value than the inflated RR/B price, why do they always charge more for RR/B bits grrr.
Hi Maxwell I don't have a pattern to shop with (yet)lol and can't find the spec.
Hi Richard I agree but it costs nothing to shop around online, wish I was rich like you lol.
Thanks again
Mike
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richard george yeaman
Grand Master
Username: richyrich

Post Number: 887
Registered: 4-2012
Posted on Thursday, 07 December, 2017 - 09:47 am:   Edit PostDelete PostView Post/Check IP

Hi Michael good luck with your search, I am so glad I can still be perceived as being Rich, and I am, but its not with money, My user name is not a clue to my wealth LOL.

Richyrich.
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gordon le feuvre
Prolific User
Username: triumph

Post Number: 222
Registered: 7-2012
Posted on Thursday, 07 December, 2017 - 08:11 pm:   Edit PostDelete PostView Post/Check IP

Michael, you asked why R-R prices are higher than any one else. They say it is extra quality control. In the 70's the dealer price for screen for Cloud 111 was 600+. Autoglass 200. I was asked by insurance company to qualify this. The response from R-R was their man could see issues with glass that no one else could see including glass manufacturer's own team, so the rejection rate was very high. Manufacturer then sold "rejected" screens to Autglass, they said they had never had complaint!! The point, is there an element of overkill here, surely if the filter is good enough for GM quality is that not enough?

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