Has anyone undersealed their A110?

Has anyone undersealed their A110?

Author
Discussion

OliffeFox

Original Poster:

38 posts

32 months

Tuesday 12th September 2023
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Hi all,

I am thinking of undersealing my A110 as it is a "keeper", I enjoy using it year round and I am aware that just because its aluminium doesn't mean it won't corrode.

Has anyone any experience of doing this already ?

thanks

Simon.

timhum

163 posts

189 months

Tuesday 12th September 2023
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Doesn't the undertray cover most of theunderside of the car? You coujld underseal that but I guess that its plastic so not necessary

Tim

Andy642

16 posts

20 months

Tuesday 12th September 2023
quotequote all
My car is a 2019 and, before I bought it 18 months ago, looks as though it had been run through winter.
I plan to keep it for the foreseeable future so when I serviced it last year I stripped all the under trays and wheel arch liners off to give it a close inspection.
The main areas of concern were,

The radiators were showing alloy oxidisation so I sprayed those with WD40 from both sides to give them some protection. This will have to be repeated but I don’t plan to run the car through winter. I love the smell!

A lot of the fixings clips that received bolts holding the under trays were rusting. Poor quality Renault parts I’m afraid. I Waxoiled those and used Copperslip on the bolts.

The headlight transformer packs had surface corrosion. Sprayed with WD.

The wheel arch areas front and rear were generally ok but most of the alloy brackets on the suspension and engine mounts again had surface corrosion. I Waxoiled everything!

I hate white powder covered engines and gearboxes so they both get WD sprayed. And no the engine hasn’t burst into flames yet🙄

All very time consuming but I hope worth while.
It’s a problem buying cars from the North (as well as running them up here) as the councils are obsessed with chucking salt on the roads at the remotest sign of a frost. It truly knackers any alloy components.

kdempsie

97 posts

175 months

Wednesday 13th September 2023
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I haven’t undersealed my Alpine however, I used ACF 50 on my kit car and it makes a really good job of stopping aluminium corrosion. It can be sprayed or brushed on and is thin enough to get into tight spaces.

Keith.

jont-

119 posts

95 months

Wednesday 13th September 2023
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One area to pay particular attention to would be the jacking points. These are made of steel, and get pelted quite badly by anything the car throws up, especially the forward facing edges of the front jacking points.

agreed the mild fixing clips are bad too - yet another Lotus copycat effort...

Cockyj

17 posts

29 months

Saturday 20th January
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I'm thinking of protecting my undercarriage with Lanoguard..... I'm getting in touch with Litchfield in Tewkesbury to see if they can do my PE like they've done to one of Chris Harris Porsches. My car was originally in Scotland ,and I run it through the winter too.

Liam22

138 posts

112 months

Sunday 21st January
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I'm not bothered by a protective white film of aluminium oxide corrosion but after 12k miles and light use through 2 winters I have noticed the engine undertray fixings are eating away at the undertray (galvanic corrosion). The benefit of doing intermediate oil changes/inspections.

I've applied copper grease to the bolt washers (where they meet the aluminium) as a temporary measure but will investigate a set of nylon washers. Something I'd happily pay Life110 for wink

worldwidewebs

2,480 posts

256 months

Monday 22nd January
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eBay for nylon washers or just use some Duralac

Liam22

138 posts

112 months

Monday 22nd January
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worldwidewebs said:
eBay for nylon washers or just use some Duralac
Thank you. I am well aware of the existence of both things. So unless you've already measured and counted the undertray fixings I'll save the eBay search until I have them.

worldwidewebs

2,480 posts

256 months

Monday 22nd January
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Liam22 said:
Thank you. I am well aware of the existence of both things. So unless you've already measured and counted the undertray fixings I'll save the eBay search until I have them.
Tetchy. Yes I have

Liam22

138 posts

112 months

Monday 22nd January
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worldwidewebs said:
Tetchy. Yes I have
Fair. And now I've probably blown my chance of you sharing that information with me smile

Julian Thompson

2,585 posts

244 months

Thursday 25th January
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I have got all my undertray bolts off at the moment. What do you need to know?

Liam22

138 posts

112 months

Friday 26th January
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Julian Thompson said:
I have got all my undertray bolts off at the moment. What do you need to know?
The thread diameter and shoulder diameter for the T30 and T40 bolts would be cool - thanks!

Panamax

4,789 posts

40 months

Friday 26th January
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I thought the BIG PROBLEM with underseal is that once moisture gets in behind it there's a real danger corrosion will be accelerated, not reduced. I certainly wouldn't underseal any car of mine.

Park outside or in a well ventilated garage. Poorly ventilated garages just make things worse, holding humidity.

Julian Thompson

2,585 posts

244 months

Friday 26th January
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Liam22 said:
Julian Thompson said:
I have got all my undertray bolts off at the moment. What do you need to know?
The thread diameter and shoulder diameter for the T30 and T40 bolts would be cool - thanks!
Will do, send you pics and details tmz.

Julian Thompson

2,585 posts

244 months

Saturday 27th January
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The main silver bolts that hold the shear plates on are M8 with captive 22mm diameter washers. The shank is 5mm and the thread length including the shank is 28mm.

The 4x longer black bolts that hold the rear diffuser at the back are M6 with captive 22mm washers. The shank is just 2mm and the thread length including the shank is 30mm.

The shorter black bolts that hold the rear undertray are M6. They have no washers but their head is 17mm diameter. They are threaded all the way down and that thread length is 20mm.