Rear axle differential seal gasket

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Rear axle differential seal gasket

Post by drcdb15 » Mon May 07, 2018 2:49 pm

I have done some searching and can't find anything specific to the MB differential elsewhere on the Forum so hopefully this thread won't duplicate anything.

MB61 passed its MoT last week :hurrah: and the only 'advisory' (we're not allowed to call them that now, are we) was an oil weep from the diff cover. Now I'd planned to change the oil here anyway as I guess from the history I know that it will still have its original oil in it, so I need to get a gasket. Or do I?

So far, I know the gasket for the 6A, 6B and 8B are all the same (even same Reliant part number, 207827), and Mick Gaughran's MB site says the MB diff casing is 'pretty much the same', confirmed by the same part numbers for the casing and the cover (216705 and 210366 respectively) for the 6B, 8B and MB. However, the MB parts list shows (below) the gasket but does not assign it a part number - obviously an error, but it begs the question, do I need a gasket at all, or would 'instant gasket' sealant be better - and if so, which one would members recommend?

I see lots of stuff on eBay from Retro Parts, offering RTV sealants with almost magical properties. Companies House reveals Retro Parts Ltd to be a one-man operation turning over around £30Kpa - nothing wrong with that of course, but is his stuff really better than the likes of Loctite and Dow? What do other folks use for sealing the rear diff?
MB rear diff diagram K1.jpg
MB rear diff diagram K1.jpg (128.32 KiB) Viewed 665 times


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Rear axle differential seal gasket

Post by peter freeman » Mon May 07, 2018 3:22 pm

Plenty of gasket paper out there for you to make your own. Hold it in place on the rear cover and gently tap the edge with a hammer to cut out to shape. Perhaps now a lost art but really not difficult for a amateur to do - some here - https://www.amazon.co.uk/s/?ie=UTF8&key ... 2417076713



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Rear axle differential seal gasket

Post by Coupe Racing » Mon May 07, 2018 4:46 pm

I bought a hole punch set too - well worth it for ease of making the bolt holes


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Rear axle differential seal gasket

Post by scimjim » Mon May 07, 2018 4:48 pm

The Sierra diff on the small sports doesn’t have a gasket - but the tolerances on the 4HA are probably a little larger? I’d just buy a new gasket and use a smidge of hylomar blue.


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Rear axle differential seal gasket

Post by drcdb15 » Mon May 07, 2018 8:41 pm

peter freeman wrote:
Mon May 07, 2018 3:22 pm
Plenty of gasket paper out there for you to make your own. Hold it in place on the rear cover and gently tap the edge with a hammer to cut out to shape. Perhaps now a lost art but really not difficult for a amateur to do - some here - https://www.amazon.co.uk/s/?ie=UTF8&key ... 2417076713
I don't know that taking a hammer to a mating surface is such a good idea, no matter to just the edges and how gently you try - I was always told to rub the edge of the surface through the paper using a soft metal like copper, or a hardwood block, at 45 degrees to the mating face. Thanks for the link, there's also a thread on the Forum headed simply "Paper gaskets" where the various options are discussed at some length - seems shipping charts are printed on very suitable paper, presumably oiled to withstand the marine atmosphere :lol:

Anyway, my question was really about the pros and cons of a traditional gasket (which looks like it may be quite hard to source unless anyone can tell me where MB got their diffs from, was it Ford again?) versus an instant gasket out of a tube, which is convenient in itself, and as Jim says, you may want to use anyway.

Thanks as always folks for your thoughts.


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Rear axle differential seal gasket

Post by scimjim » Mon May 07, 2018 8:49 pm

MB diff is just a Salisbury 4HA like most GTEs (not Ford) - I’m surprised the gaskets are difficult to find?


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Rear axle differential seal gasket

Post by gtcse8 » Mon May 07, 2018 8:50 pm

When I changed Mick`s for his polished Alloy cover I used the paper gasket type.

But they can be sealed with Silicone RTV, if you wait for the "Bead" to skin over before offering the cover up.

Haven't heard from Mick if his is still oil tight.

I do use a slightly higher torque than in the book.


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Rear axle differential seal gasket

Post by peter freeman » Mon May 07, 2018 9:09 pm

There are hammers and there are hammers.



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Rear axle differential seal gasket

Post by philhoward » Mon May 07, 2018 9:10 pm

It isn’t the size of the hammer, it’s how you use it.. :wink:


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Rear axle differential seal gasket

Post by peter freeman » Mon May 07, 2018 9:43 pm

used it most of my working life in this way - taught to use it as off the shelf gaskets are not always available.



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Rear axle differential seal gasket

Post by Elizabeth's dad » Mon May 07, 2018 9:56 pm

I have just fitted a new cover on the diff of my 5a. Given that the diff is basically the same as a Jag, I used a silicone gasket for a Jag from a hot rod shop on ebay with a bit of Hylomar for added security.


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Rear axle differential seal gasket

Post by drcdb15 » Mon May 07, 2018 11:58 pm

philhoward wrote:
Mon May 07, 2018 9:10 pm
It isn’t the size of the hammer, it’s how you use it.. :wink:
Left handed, I suppose ... :lol: Ah, reminds me of Steve's hammer... Steve was a builder (still is) who did some work for me (building roof trusses among other things) and whilst 'normal' people had 16oz hammers, Steve had a beast at 24oz, useful when you're nailing roof trusses. He had biceps like tree trunks, and sneered at namby-pamby 'boys' with their nail guns. Reckoned he could drive a 6 inch nail home with a single blow from his 'beast'.

Er, sorry... gone a bit off-topic there ... :W


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Rear axle differential seal gasket

Post by drcdb15 » Tue May 08, 2018 12:02 am

scimjim wrote:
Mon May 07, 2018 8:49 pm
I’m surprised the gaskets are difficult to find?
I don't know that they are, I just noticed QRG doesn't list them explicitly, and a google for Reliant diff gasket gets nowhere, so I haven't tried seriously yet - as I didn't know the specific part I was looking for other than the Reliant number. But armed with your info doubtless I can find one. Thanks :)

Edit: even with that info I find eBay not exactly awash with them. Just 6 on offer, though one did mention Reliant, so that's progress. Over £6 delivered :roll: but under £1 at some stores - with £5 delivery :cry: Still, it's not something I plan on doing too often. Best price I've found: £5.39 delivered from Coventry Auto Components. One supplier is offering them at only £1.41, but charging over £7 for delivery :lol:


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Rear axle differential seal gasket

Post by scimjim » Tue May 08, 2018 8:25 am

JB Engineering and Salisbury transmissions (website seems to be under build?) are both mentioned on here for axle parts.


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Rear axle differential seal gasket

Post by scimjim » Tue May 08, 2018 8:41 am

The Land Rover gasket LOOKS the same (RTC1139) and although the 8HA is a much bigger axle, there’s an outside chance it’s the same gasket?


Jim King

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), Sabre/MX5 auto (The Flying Broomstick),
1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

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