Removing undertray - BMW M5 Forum and M6 Forums
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post #1 of 10 Old 23rd April 2008, 06:47 PM Thread Starter
topper
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Removing undertray

I want to get the undertray off to have a look at things. I can't actually jack the car up at the moment - my jack is too tall to fit unless I drive it onto bricks or wood, and I can't drive it as half the engine bay is in my conservatory.

Anyway, access under there is still okay. The middle section appears to have four screw holes, two on each side. I can feel that none of them are there. So what's keeping it in?

Do I have to take the side undertrays off first? That might be a pain as I can't turn the wheel and it looks like they are secured under the wheel arch, not just under the engine.
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post #2 of 10 Old 23rd April 2008, 08:08 PM
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Humm ... I removed it a couple years ago ... so I am working with a feeble memory.

I think it is held on with 8 or maybe 10 fasteners total. 4 (as I recall) are 10MM hex bolts, and 6 (again, as I recall) are philips screws.

The front (just behind the bumper) is held in place with a grove that the lower lip of the front bumper fits into. (Again, not sure.)

I did take off the lower covers, inside each fender (my original intent, but I decided to take down the center cover for ease of repair ... I had hit something on the highway that broke the lower right cover).

With the car still on the ground, I did it all with no problem. If you could just get it up high enough to get your head underneath ... understanding the problems in doing that ... You should be able to see everything you need to fix.

"The greatest obstacle to discovery is not ignorance; it is the illusion of knowledge."

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post #3 of 10 Old 30th April 2008, 11:10 PM Thread Starter
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Quote:
Originally Posted by jclyman View Post
I think it is held on with 8 or maybe 10 fasteners total. 4 (as I recall) are 10MM hex bolts, and 6 (again, as I recall) are philips screws.

The front (just behind the bumper) is held in place with a grove that the lower lip of the front bumper fits into. (Again, not sure.)
I'm still wrestling with this, believe it or not. Sorry for being thick.

Does the front bumper need to come off?
Does the thin black trim at the bottom of the front bumper need to come off?
Does it need to be unscrewed from the other shield that is further back under the car?
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post #4 of 10 Old 1st May 2008, 01:37 AM
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The middle section (basically covers the transmission) has more than 4 screws holding it in. If I remember correctly, there are two that are hidden from view just forward and to the right and left of the center jacking point. They are recessed up an inch or so.

I hope this helps.

Last edited by PaulRuffo; 1st May 2008 at 01:38 AM.
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post #5 of 10 Old 1st May 2008, 02:50 AM
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Quote:
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I'm still wrestling with this, believe it or not. Sorry for being thick.
No problem.
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Does the front bumper need to come off?
Absolutely NOT.
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Does the thin black trim at the bottom of the front bumper need to come off?
Yes, but I believe it is part of the underpan.
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Does it need to be unscrewed from the other shield that is further back under the car?
I don't think so.

I just went out and looked at my car (without jacking) and found the following:

At least 4 - 10MM bolts (recessed) to be removed. At least 2 Phillips fasteners to be removed. Could be 4 more, not sure.

The black pieces on either side (in front of the wheels) do NOT have to be removed.

And, d@mit, I see mine is coming loose again (at least one fastener missing and two others loose) ... so, in a way, thanks. I'm glad I looked.

No way you can drive it up on a curb so you can crawl underneath?

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post #6 of 10 Old 1st May 2008, 03:00 AM
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While freshening my new (to me) M5 up I have taken off every underbody panel and wheel well liner and either replaced or cleaned so I have some recent experience.

1. The front bumper does not have to come off.

2. I think it wouldn't hurt if one side (either left or right) of the front portion of one of the under bumper black trim/forward wheelwell liner came off or was loosened. One side of mine was broke at the time I removed the front engine splash shield and i replaced it and then went to reinstall the splashshield and found it difficult to wedge the splash shield back in but I managed to do it

Someone else can pipe in with advice here but I would think BMW would not design it so you had to remove one of the forward wheel liner/under bumper things to get the splashshield out but cold be wrong.

3. The splashield fits into a lip of sorts above the rear of the front bumper fairly tightly (as noted above) and this provides a good deal of the mechanical integrity to hold it in there. There are (from memory) a couple of 10mm bolts on either side of the front of the splash shield that screw into the front wheel liner/under bumper trim plus two of the phillips head quick turn/release fasteners on each side. There is one more quick release fastner on each side at the very rear of the shield towards the transmission/Cats. These fastners are part of the second plastic shield that covers the transmission tunnel, so yes you do have to release these as second/transmission shield fits over the top of the rear of the splash shield. (also note these fastners are held in by a washer/clip so they won't come all the way out)

That should allow enough for you to pry the rear of the splashshield from under the tranny shield without totally removing it (tranny shield). The splashield should now be showing signs of wanting to drop away from the car and I think the only thing you will need to do is pull it away from the lip where it's lodged under the front bumper. Again might be easier with one of the under bumper/front trim pieces removed but should be doable without.

Hopefully this jumbled description doesn't just confuse you more



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I'm still wrestling with this, believe it or not. Sorry for being thick.

Does the front bumper need to come off?
Does the thin black trim at the bottom of the front bumper need to come off?
Does it need to be unscrewed from the other shield that is further back under the car?

Tom
Seacoast NH

2002 Imola Red M5 with various Dinan Bits
2008 Porsche Cayman S
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post #7 of 10 Old 3rd May 2008, 11:02 PM Thread Starter
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post #8 of 10 Old 29th October 2008, 04:48 AM
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any pixs of the splash shield DIY? I have to replace mine and where would I get the part?
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post #9 of 10 Old 29th October 2008, 05:43 AM
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Without offending, if you need a DIY to remove the undertray you should not be operating a screwdriver!

Seriously, just look and do.

It is, of course, a dealer only item. Call the 3 or 4 dealers that operate a mail order/internet outlet.
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post #10 of 10 Old 29th October 2008, 06:55 AM
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