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Nasty Scrape from rough road #742705
24/05/22 10:10 AM
24/05/22 10:10 AM
Joined: May 2011
Posts: 1,283
South West Hertfordshire, UK
Quicksilver Online content OP
Has a lot to Say!
Quicksilver  Online Content OP
Has a lot to Say!

Joined: May 2011
Posts: 1,283
South West Hertfordshire, UK
I left a pub yesterday evening in my 3.7. The exit was on a nasty, rough incline with an uneven surface. Pulling away I heard a horrendous scraping from underneath my car. The car drove fine and seems ok in its handling but immediately after the scrape there was a horrible noise from the underside and wheels which sounded like bits of dust swirling around in the wheels. This stopped after about a minute.

The car is in for its service next month so I will get this checked. Does anyone think this could be an issue or just a routine scrape the car can withstand?


David
2020 Roadster 3.7 Dove Grey.
Re: Nasty Scrape from rough road [Re: Quicksilver] #742709
24/05/22 10:53 AM
24/05/22 10:53 AM
Joined: Feb 2016
Posts: 4,902
East Harling, Norfolk UK
RichardV6 Offline
Part of the Furniture
RichardV6  Offline
Part of the Furniture

Joined: Feb 2016
Posts: 4,902
East Harling, Norfolk UK
Scraped mine a few times on speed bumps. Initially the overlong seat bolts would touch and/or the inverted U section cross member where it dips under gearbox. Shortened bolts and also exhaust bobbin excess thread so now only the cross member to catch. Oh forgot to mention tail pipes also scraped slightly on broad humps but a thing of the past now with side pipes laugh2

Can only add that scrapes always sound worse than any damage done. Maybe a peek underneath with a torch wouldn't go amiss but doubt you will see anything untoward.


Richard

2018 Roadster - Red/Magnolia - "Morton"
1966 Land Rover series 2a SWB
1945 Moto Guzzi Airone
Re: Nasty Scrape from rough road [Re: RichardV6] #742710
24/05/22 10:59 AM
24/05/22 10:59 AM
Joined: May 2011
Posts: 1,283
South West Hertfordshire, UK
Quicksilver Online content OP
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Quicksilver  Online Content OP
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Joined: May 2011
Posts: 1,283
South West Hertfordshire, UK
Phew ! Good to know - thanks Richard.


David
2020 Roadster 3.7 Dove Grey.
Re: Nasty Scrape from rough road [Re: Quicksilver] #742726
24/05/22 02:34 PM
24/05/22 02:34 PM
Joined: Mar 2017
Posts: 1,866
Oxon
Craig Jezz Offline
Talk Morgan Enthusiast
Craig Jezz  Offline
Talk Morgan Enthusiast

Joined: Mar 2017
Posts: 1,866
Oxon

Why not fit a chassis-cross-member rub plate? It also protects the brake pipe on mine as you can see here.

https://www.wolfperformance.co.uk/product/trad-chassis-cross-member-rub-plate/

[Linked Image]


[Linked Image]


Craig Jezz

Morgan 4/4 Sports Sand
Re: Nasty Scrape from rough road [Re: Craig Jezz] #742728
24/05/22 02:38 PM
24/05/22 02:38 PM
Joined: May 2011
Posts: 1,283
South West Hertfordshire, UK
Quicksilver Online content OP
Has a lot to Say!
Quicksilver  Online Content OP
Has a lot to Say!

Joined: May 2011
Posts: 1,283
South West Hertfordshire, UK
Thanks Craig. That’s a good tip and I wasn’t aware of that product. I might ask Richard Thorne to look at that when I service the car.


David
2020 Roadster 3.7 Dove Grey.
Re: Nasty Scrape from rough road [Re: Quicksilver] #742729
24/05/22 03:00 PM
24/05/22 03:00 PM
Joined: Mar 2017
Posts: 1,866
Oxon
Craig Jezz Offline
Talk Morgan Enthusiast
Craig Jezz  Offline
Talk Morgan Enthusiast

Joined: Mar 2017
Posts: 1,866
Oxon


Craig Jezz

Morgan 4/4 Sports Sand
Re: Nasty Scrape from rough road [Re: Craig Jezz] #742731
24/05/22 03:12 PM
24/05/22 03:12 PM
Joined: May 2011
Posts: 1,283
South West Hertfordshire, UK
Quicksilver Online content OP
Has a lot to Say!
Quicksilver  Online Content OP
Has a lot to Say!

Joined: May 2011
Posts: 1,283
South West Hertfordshire, UK
Does it lower the ride height though, making more crashing noises whilst protecting the chassis cross member?


David
2020 Roadster 3.7 Dove Grey.
Re: Nasty Scrape from rough road [Re: Quicksilver] #742732
24/05/22 03:16 PM
24/05/22 03:16 PM
Joined: Dec 2008
Posts: 20,335
South Yorkshire
DaveW Offline
Roadster Guru
DaveW  Offline
Roadster Guru
Member of the Inner Circle

Joined: Dec 2008
Posts: 20,335
South Yorkshire
Originally Posted by Quicksilver
Does it lower the ride height though, making more crashing noises whilst protecting the chassis cross member?


Because the crossmember is an inverted U shape, occasionally owners have grounded and got stuck.

The skid plate is maybe 3mm thick but covers the edges of the "U" making getting stuck less likely.


DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
Re: Nasty Scrape from rough road [Re: Quicksilver] #742747
24/05/22 06:51 PM
24/05/22 06:51 PM
Joined: Nov 2015
Posts: 4,863
Northern Capital of Cool
CooperMan Offline
Just barreling along
CooperMan  Offline
Just barreling along
Part of the Furniture

Joined: Nov 2015
Posts: 4,863
Northern Capital of Cool
David, as others have said probably caught the crossmember, it always sounds awful but usually just removes the protective underseal coat

One watchpoint on 3.7's is the thin steel plate shown here that protrudes low

[Linked Image]

As it serves no purpose, I carefully ground mine away (the bubbly stuff on the crossmember is some waxoil spray to replace the scraped edge)

[Linked Image]


Jon M
Re: Nasty Scrape from rough road [Re: Quicksilver] #742768
24/05/22 09:39 PM
24/05/22 09:39 PM
Joined: Feb 2016
Posts: 4,902
East Harling, Norfolk UK
RichardV6 Offline
Part of the Furniture
RichardV6  Offline
Part of the Furniture

Joined: Feb 2016
Posts: 4,902
East Harling, Norfolk UK
Originally Posted by Quicksilver
Does it lower the ride height though, making more crashing noises whilst protecting the chassis cross member?

Yes it does and yes it would which is why I haven't been tempted. Brake lines are nowhere near the lowest points on our Roadsters BTW. Hopefully not on any others either.


Richard

2018 Roadster - Red/Magnolia - "Morton"
1966 Land Rover series 2a SWB
1945 Moto Guzzi Airone
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