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 Post subject: Gearbox tunnel sealing
PostPosted: Mon Sep 24, 2018 9:04 pm 
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Hi all. I am sure this has been covered many times before, but does anyone have any recommendations for sealing a gearbox tunnel?

I've removed mine to deal with some grot (caused likely by the seal failing in the first place), so after I have cleaned it all up and dealt with the rust I will want to seal it properly.

Any ideas much appreciated.

Kind Regards

MC

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1980 1500HL - OPD
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PostPosted: Mon Sep 24, 2018 10:24 pm 
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I bought this for my Toledo, but it's going to be some months before I try it:

https://shop.tssc.org.uk/product/gearbo ... l-seal-kit

I didn't measure to see if 3m was long enough!

I don't think the fixing are any good, but hopefully the seal itself will be.

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1971 Triumph Toledo 2 door
1977 Triumph Stag
Toledo blog, Toledo & Dolomite part catalogues & repair manuals


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PostPosted: Mon Sep 24, 2018 10:52 pm 
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Quote:
Hi all. I am sure this has been covered many times before, but does anyone have any recommendations for sealing a gearbox tunnel?

I've removed mine to deal with some grot (caused likely by the seal failing in the first place), so after I have cleaned it all up and dealt with the rust I will want to seal it properly.

Any ideas much appreciated.

Kind Regards

MC
What you need is dumdum sealant, but they stopped making it. Basically a flexible sealant that doesn't set.

I am going to try a couple of strips of universal weather seals on mine, to see if they will work.


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PostPosted: Mon Sep 24, 2018 11:14 pm 
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As my Sprint is ostensibly a racer it is stripped bare inside. I have used a type of draught seal tape that is adhesive on one side.

I have been to quite a few very wet events this year, namely Croft at Easter during the Beast from the East and later at 3 Sisters where I was literally going through water splashes.....as there's no carpet I can see if any water comes in....result, no leaks!

Something like this....

https://rover.ebay.com/rover/0/0/0?mpre ... 2385847929


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PostPosted: Tue Sep 25, 2018 8:55 am 
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Old fashioned windscreen sealant, still available from motor factors, in plastic tubes. It's pretty much non-setting.


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PostPosted: Tue Sep 25, 2018 9:14 am 
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Silicone sealant or butyl strip. The strip though is quite messy to remove if you need to whereas silicone sealant often peals away quite nicely.

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1961 Chevrolet Corvair Greenbrier Sportswagon
1980 Dolomite Sprint project using brand new shell
2009 Mazda MX5 2.0 Sport
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PostPosted: Tue Sep 25, 2018 10:19 am 
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I used a neoprene sponge which is waterproof when compressed, roughly 15mm thick from Ebay.

The self adhesive was not doing a good job, so a bit of glue and some bulldog clips helped stick it down overnight.

The picture was taken after removing the tunnel to change a O/D switch, and put back with no extra works to the strip.


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PostPosted: Tue Sep 25, 2018 10:30 am 
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The neoprene foam idea is spot on. I think I might go with that.

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1961 Chevrolet Corvair Greenbrier Sportswagon
1980 Dolomite Sprint project using brand new shell
2009 Mazda MX5 2.0 Sport
2018 Infiniti Q30


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PostPosted: Tue Sep 25, 2018 4:37 pm 
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Quote:
Quote:
Hi all. I am sure this has been covered many times before, but does anyone have any recommendations for sealing a gearbox tunnel?

I've removed mine to deal with some grot (caused likely by the seal failing in the first place), so after I have cleaned it all up and dealt with the rust I will want to seal it properly.

Any ideas much appreciated.

Kind Regards

MC
What you need is dumdum sealant, but they stopped making it. Basically a flexible sealant that doesn't set.

I am going to try a couple of strips of universal weather seals on mine, to see if they will work.
There is panel sealant which comes as a tape - a modern version of dumdum

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PostPosted: Tue Sep 25, 2018 5:46 pm 
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I would have thought that something modern like Sikaflex 512, Tiger Seal or butyl rubber caulking strips would outperform that old Eldro Dumdum stuff anyway.

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Current fleet: '75 Sprint, '73 1850, Daihatsu Fourtrak, Honda CG125, Yamaha Fazer 600, Shetland 570 (yes it's a boat!)

Past fleet: Triumph 2000, Lancia Beta Coupe, BL Mini Clubman, Austin Metro, Vauxhall Cavalier MK1 & MK2, Renault 18 D, Rover 216 GSI, Honda Accord (most expensive car purchase, hated, made out of magnetic metal as only car I've ever been crashed into...4 times), BMW 318, Golf GTi MK3 16v x 3


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PostPosted: Tue Sep 25, 2018 6:21 pm 
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Quote:
I would have thought that something modern like Sikaflex 512, Tiger Seal or butyl rubber caulking strips would outperform that old Eldro Dumdum stuff anyway.
I don't know anything about Sikaflex 512 but I wouldn't use Tiger Seal - you want to get the tunnel off now and then! :D


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PostPosted: Tue Sep 25, 2018 6:47 pm 
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Oh yeah, good point! :oops: Forget those first two then, seal really well, permanently... A non setting mastic such as a poly butyl rubber caulking then, I've used IDL99 on my boat windows and deck, definitely waterproof and flexible.

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Current fleet: '75 Sprint, '73 1850, Daihatsu Fourtrak, Honda CG125, Yamaha Fazer 600, Shetland 570 (yes it's a boat!)

Past fleet: Triumph 2000, Lancia Beta Coupe, BL Mini Clubman, Austin Metro, Vauxhall Cavalier MK1 & MK2, Renault 18 D, Rover 216 GSI, Honda Accord (most expensive car purchase, hated, made out of magnetic metal as only car I've ever been crashed into...4 times), BMW 318, Golf GTi MK3 16v x 3


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PostPosted: Tue Sep 25, 2018 8:11 pm 
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Spot on gents, thanks for the replies.

These all look like viable options and I will look at a 'Dum Dum' equivalent or the neoprene option.

Cheers.

MC

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Matt Cotton

TDC Oxfordshire Area Organiser.
TDC/TSSC group meeting - 3rd Tuesday of the month
The Duke at Clifton - OX15 0PE

1980 1500HL - OPD
1976 Sprint - SWU


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PostPosted: Thu Sep 27, 2018 7:12 pm 
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I used this:-

http://www.jamespaddock.co.uk/gearbox-tunnel-seal-3


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PostPosted: Sun Sep 30, 2018 11:07 am 
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I went through this a few weeks ago, butyl strip was recommended by a member and this I used. 8mm strip, on a roll, warm it up it goes nice and soft, I then bolted it down with 6mm nuts and bolts for added strength. The strip takes up all the varying gaps around the tunnel and never sets so can be easily removed.
I did get some rolls of neoprene foam but found this a little tricky on the varying bends plus then adding all the bolt holes, I did however use the foam on the straight bits at the very top front.

Hope that helps.

Got the butyl from eBay, the branded one in a yellow box if you search.

Chris.


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