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21st June 2019, 07:52 | #11 |
Posted a thing or two
75 Conn CDT Tourer, 75 Conn SE V6, 75 Conn V6, 75 Conn CDTi Tourer, ZS 180 Join Date: Jan 2014
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Hi Arctic, as far as I know, the foam diaphragms are there to stop noise being transmitted from the sills up into the B-pillar, right next to the driver's & passenger's ears.
With the massively complicated & interconnected design of any modern bodyshell, vibration, noise and rumble from the front & rear subframes will eventually find it's way through to the effectively tubular sills, which can then act like a tunnel to move the noise along. Being connected directly to the base of the B-pillar means this unwanted sound would end up travelling upwards, next to the front seats, at head level. On 75's, there's another sealed diaphragm across the base of the B-pillar. In my humble opinion, the sill diaphragms do not directly cause rust - infact the rust in the rear of the sill always seems to have stopped just before it meets the foam. If they were made of open-cell, they'd hold moisture, but it seems the opposite is true - they are actually stuck so well to the surrounding metalwork that no damp can get close !! However, they do stop any chance of air movement (exactly what I believe they were designed to do), and as such, might limit any moisture removal from evaporation within the sill. However, if this was the main cause of the rust in our sills, the centre sections would rot out badly as this area is sealed on all three sides !!! And as it is, 75's are generally very good in this area (.....except my S-reg....)
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22nd June 2019, 09:27 | #12 |
Posted a thing or two
75 Conn CDT Tourer, 75 Conn SE V6, 75 Conn V6, 75 Conn CDTi Tourer, ZS 180 Join Date: Jan 2014
Location: Devon
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Found out yesterday (on S542AOX) that there's another, smaller foam diaphragm located up inside the rear wheel arch cavity. It's fitted below and roughly vertically in-line with the rear door catch.
I guess this again shows they don't cause rust, otherwise the normally susceptible arches would be rotting out at this point - something I've never seen
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22nd June 2019, 09:47 | #13 |
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2015 Mini Challenge 210 & 2005 Rover 75 Classic CDTi Join Date: Apr 2008
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Nice to hear and see that you are really cracking on with the car Paul. I can't wait to see the results.
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23rd June 2019, 16:02 | #14 | |
Posted a thing or two
75 Conn CDT Tourer, 75 Conn SE V6, 75 Conn V6, 75 Conn CDTi Tourer, ZS 180 Join Date: Jan 2014
Location: Devon
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Quote:
I doubt very much that your pristine example will ever require such surgery !!
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24th June 2019, 09:24 | #15 | |
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2015 Mini Challenge 210 & 2005 Rover 75 Classic CDTi Join Date: Apr 2008
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Quote:
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12th July 2019, 13:36 | #16 |
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Rover 75 Saloon Join Date: Apr 2019
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Thanks Paul
Just to say thanks to Paul (Sonic ZS) for all the pics. Excellent info - now we know how these things have been put together.
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13th July 2019, 07:55 | #17 |
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75 Tourer CDTi Connie SE Join Date: Jun 2017
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[QUOTE=I guess this again shows they don't cause rust, otherwise the normally susceptible arches would be rotting out at this point - something I've never seen [/QUOTE]
The rear wheel arches on my Tourer have started to bubble with some rust already in this area. Once the dam rain stops here, i will strip the paint and treat before it gets too bad! The front offside wing is already too far gone to save and is being replaced!
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My 75 Tourer CDTi was born Saturday, 21st June 2003 @ 09:50 My 75 was the 18,749th 75 Tourer to run off the production line, out of 27,407 It was the 195th 75 Tourer CDT Connoisseur SE (135) to be made out of 2,074 and the 1,789th 75 Tourer in Wedgewood Blue Metallic (code: JEL) to be made out of 1,871 Wedgewood Blue Metallic 75 Tourers |
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