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Hot Rod
#1 Posted : 11 October 2018 12:15:48(UTC)
Hot Rod

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Took the wheels off my '16 plate last night and was amazed to see how little underseal there is, plus what looks like masking tape covering big holes into the 'chassis' box sections.  The jacking points look super flimsy and not treated either.  I know Mazda saved weight on this car but seems short-sighted.

Any thoughts on adding extra underseal, or plugging the holes with something better than tape??  Or am I worrying about nothing?

Thanks all, Simon

 

John M
#2 Posted : 11 October 2018 12:24:56(UTC)
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I don't suppose anyone knows yet how the ND will fare, but it doesn't look well protected.  I had mine waxed underneath by https://www.themx5restorer.co.uk/

If you plan to own it long term then I think it's a good idea to get it done, or do it yourself.

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Countryboy
#3 Posted : 11 October 2018 12:43:25(UTC)
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Hi Simon.  Since the ND came out this subject has been discussed on many and various threads and it's been noted that although some "sensitive" areas had limited stone-chip protection, the car lacked comprehensive underbody protection, same as the earlier models.  It was recommended that if you felt it was an important issue to get the car thoroughly treated with underbody protection, I did and had my 2015 treated with Dinitrol shortly after purchase.

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Don't take my post as a personal attack, it's not! Just sound advice stupid!

Old enough to know better! Too old to change!!
Mad Malc
#4 Posted : 11 October 2018 14:50:17(UTC)
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https://www.mx5oc.co.uk/forum/yaf_postst87727_Mk4-Underseal-How-To.aspx.   

This is where you need to look, everything you need to know is on this thread.

I did ours myself, and use 'Duckoil' regularly on the suspension and other exposed bits. Take extreme care not to get any product on the discs, cover them up carefully and let any mist settle before exposing them again.

Mad Malc by the sea in Filey with a Mk4 SE-L Nav 2.0 in Artic White
AndyMk2
#5 Posted : 11 October 2018 15:02:02(UTC)
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It was an optional extra in Japan, but not offered in the UK it seems

Drumtochty
#6 Posted : 11 October 2018 15:29:59(UTC)
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Andy, to do it properly you need to do it before the subframes are attached, I think the extra cost option you can get done in Japan is after the car is put together. Maybe wrong.
Eddie Cairns

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Drumtochty
#7 Posted : 11 October 2018 15:33:23(UTC)
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Hot Rod as you will notice my how to has been linked to by Mad Malc.

If you will only keep the car for three years it will be OK otherwise you are doing the job for the next owner.

If you intend to keep the car longer I would do it and I will be doing my own Mk4 when it arrives.

Edited by user 11 October 2018 16:10:22(UTC)  | Reason: Not specified

Eddie Cairns

99 Mk2 1.8IS
08 Mk3 2.0 Sport RC sold, Drumtochty Glen, Auchenblae, Laurencekirk,
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Hot Rod
#8 Posted : 11 October 2018 21:14:24(UTC)
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Thanks all, looks like I have a few extra jobs to do. Luckily has only 1,000 dry miles so far, spent 2 years in a garage.

Current plan is to keep it for many years to come.

Hot Rod
#9 Posted : 12 October 2018 07:43:15(UTC)
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Had a good read through, thanks Eddie

One thing that's still not clear is what to do with the 'masking tape' over the box section holes near the suspension areas.  Makes sense to inject into these holes, but can they then be re-sealed with a grommet or similar? Even Duck tape looks like it would give better protection??  Once everything is gooed-up with the Bilt sprays nothing will stick again though?

cheers Simon

Drumtochty
#10 Posted : 12 October 2018 09:56:08(UTC)
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There is one hole that there is a Mazda supplied bung that goes in to it.

Back to you on this one, you need to supply a picture to identify which hole or holes you are talking about.

Have an other read of my how to, see what I have said and I mention the main hole a good few times but a picture needed to answer your question.

Edited by user 12 October 2018 09:57:32(UTC)  | Reason: Not specified

Eddie Cairns

99 Mk2 1.8IS
08 Mk3 2.0 Sport RC sold, Drumtochty Glen, Auchenblae, Laurencekirk,
Aberdeenshire
Mad Malc
#11 Posted : 12 October 2018 10:24:43(UTC)
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. Hi HR,

When you get down to going it you will find that there is no real need to remove the tapes. There are plenty of other ways into the box sections. I only removed one tape on the drivers side rear as I could not see any other way in to a particular area. I used one of the sill bungs that I had spare to cover the hole.

It is a messy time consuming job to do it properly but a sense of achievement will follow. The availability of a full car lift would ease some of the strain.

Mad Malc by the sea in Filey with a Mk4 SE-L Nav 2.0 in Artic White
andy1964
#12 Posted : 12 October 2018 10:29:37(UTC)
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Originally Posted by: Drumtochty Go to Quoted Post

If you will only keep the car for three years it will be OK otherwise you are doing the job for the next owner.

If you intend to keep the car longer I would do it and I will be doing my own Mk4 when it arrives.

Fully agree - this is very good advice.

I knew my NC would be a "keeper" when I bought new in 2012, so after looking on this forum before I took delivery & therefore being aware of the lack of anti-corrosion treatment from Mazda I had it rustproofed very shortly after taking delivery.  I'm so glad that I did!

 

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Parker
#13 Posted : 13 October 2018 08:05:59(UTC)
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I had my RF treated with Dinitrol at CBS Autos, Nelson, Lancs. and was pleased with their work. https://www.mx5specialists.com/

There are still photos of work-in-progress on my car (amongst many others) on their FB Photo gallery .

Green'90 Eunos V-Special 1.6 Auto.>> White'18 RF Auto.
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