MG4 Undertray dip/bulge

[Macadoodle]

The only problem I have with the idea of a redesigned undertray solving the issue is that it won't change the rather odd design where the BMS ( I think ) box hangs down around 10mm lower than the surrounding structure.
The undertray curves around this like an afterthought. Does it need to be in the airflow ? Most manufacturers house this component within the battery shell. Odd.

 

[Rolfe]

Are you sure it actually does that? I've not been close enough to touch it, and others have said it's an optical illusion that it hangs down. And lots of people have undertrays that fit. Are these boxes in a different position in their cars?

 

[Macadoodle]

Hangs down the best part of half an inch on my one, had my undertray on and off many times trying to solve the oil leak, definitely not an illusion.
One of many head scratching design decisions on this car IMO.

 

[Rolfe]

Bizarre.

 

[lbdsg]

Just checked a brand new build and the bulge is still there. No redesigned tray there. Do we think there is a need for some ventilation there?? Not saying it was designed to have the bulge, it is clearly not a good fit there, but I’m concerned about tidying it up (metal bar, some sort of sealant, etc) and inadvertently causing a separate issue…thoughts?

 

[PristDean]

Just checked a brand new build and the bulge is still there. No redesigned tray there. Do we think there is a need for some ventilation there?? Not saying it was designed to have the bulge, it is clearly not a good fit there, but I’m concerned about tidying it up (metal bar, some sort of sealant, etc) and inadvertently causing a separate issue…thoughts?

It is obviously not as intended or designed, i.e warped, so it's a problem for your dealer to resolve. Any attempts at DIY repairs may invalidate your warranty.

 

[lbdsg]

It is obviously not as intended or designed, i.e warped, so it's a problem for your dealer to resolve. Any attempts at DIY repairs may invalidate your warranty.

Yes, I am inclined to agree. But that presumes the ability to find a dealer that agrees it needs to be sorted and takes action. If not, not sure which is the lesser evil - doing nothing or sorting it myself.

 

[PristDean]

Yes, I am inclined to agree. But that presumes the ability to find a dealer that agrees it needs to be sorted and takes action. If not, not sure which is the lesser evil - doing nothing or sorting it myself.

Yes, the trick is to find a dealer who has their own budget and is willing to support you, shares your views etc. If you go in with the view of "This is obviously intended to be there, but is defective because it is warped, so needs to be replaced", I think that's hard to disagree with.
Of course it's your car, but consider DIY repairs in the battery area in particular may impact the warranty and potentially the sale ability of the car.

 

[malcinaz02]

I posted in another thread about this related to water on the road. Basically I lost 40% of the under shield when it was ripped off by puddles from the recent storm. It has been replaced but the replacement has gaps either side of the center bolt. Guess we will all have to be extra careful in the rain until MG decide to fix this issue with a different material or more bolts to secure it

 

[Rolfe]

@PristDean got a new undertray fitted which seems to fit well. He reported about it in a different thread.

 

[PristDean]

I posted in another thread about this related to water on the road. Basically I lost 40% of the under shield when it was ripped off by puddles from the recent storm. It has been replaced but the replacement has gaps either side of the center bolt. Guess we will all have to be extra careful in the rain until MG decide to fix this issue with a different material or more bolts to secure it

Yes, as @Rolfe stated, mine was replaced due to gaps I found very similar to the ones you mention. This has a detrimental effect on the aerodynamics of the car, especially if you have a Trophy with down force created by the rear spoiler. The gaps will create a counter effect to that down force and also drag, as air collects behind a solid rear bumper. This will negatively impact on the cars efficiency.
Of course, debris and water will also collect and create risks as you have experienced.
If I was you, I would be straight back to your dealer to have those gaps removed, otherwise you risk the above and a repeat of what you have already experienced.

 

[GameZone]

I have this issue as well. Will the dealer replace the tray with something better, or is this due to happen again?

 

[Nobbyplopps]

I have this issue as well. Will the dealer replace the tray with something better, or is this due to happen again?

I took my car to the dealers last Monday and have been waiting for a week now for them to hear back from MG to authorise it ?

 

[coff33]

MG Australia have instructed dealers to not fix it and its not a safety issue until they figure out how to fix it properly.

 

[Nobbyplopps]

MG Australia have instructed dealers to not fix it and its not a safety issue until they figure out how to fix it properly.

That’s a weird one. Many in UK have already had their under trays replaced.

 

[Rolfe]

And when several people have already experienced broken trays, I don't think it can be said definitely not to be a safety issue.

 

[coff33]

And when several people have already experienced broken trays, I don't think it can be said definitely not to be a safety issue.

I'm just relaying what i see in mg Australia Facebook group, not that i agree with it.

 

[Norfunk]

It's the same in the UK the majority of dealers aren't fixing it in mgs instruction.

 

[PristDean]

So let's be clear.... if you found your car had large gaps with door alignments, would that be acceptable because it's not a safety issue ?... of course not. This is in effect a poor standard of parts and or installation quality. In short it's unacceptable on a brand new car and creates the potential for damage to occur, water and debris ingress, broken tray etc.
The safety argument is the dealer attempting to fob you off. Stand your ground and demand a replacement citing the above and that others have already had theirs replaced because of this, setting the precedent.

 

[tsedge]

It does seem that dealers will replace it if there's a big sag but not for a minor one.

I still can't get excited about a bit of plastic I can't see underneath the car, but I get it.