Undertray attachment parts

RDFlo · Post by **RDFlo** » Mon Feb 04, 2019 7:31 pm

I need a bit of help.

I broke the engine undertray (part 51717012723 - attached) some time ago and bought a replacement. I am trying to figure out what connecting bits I need to secure the tray in place with the rest of the car, so I can source them.

If i am not mistaken, the rear part of the tray connects with the front part of the engine reinforcement plate. I can't figure out what else the tray connects with - front bumper, wheel arches?
I can't make any sense of the BMW schematics.
Any help is much appreciated.

patriot66 · Post by **patriot66** » Mon Feb 04, 2019 8:42 pm

Is your new undertray exactly the same as the one in your photo ? If so then it is not the correct one for a 2003 2.5i. The part number you quoted is correct but it should look like this

: jkw3fd.jpg (174.74 KiB) Viewed 1540 times

and the same as in this diagram also

: 20190204_193250.jpg (58.44 KiB) Viewed 1540 times

It locates along the front edge in a groove in the bottom of the bumper and is then held up in position with about 8 x self tapping 8mm bolts and spire clips, numbers 3 and 4 in the diagram

RDFlo · Post by **RDFlo** » Mon Feb 04, 2019 9:11 pm

Ah hell. I've missed that bit.
I gues it can be good and bad. Bad as I have the wrong part, good that i don't need any extra bits and you made it clear for me. Thank you.
Where does the airduct sit, is it connected to the tray?

patriot66 · Post by **patriot66** » Mon Feb 04, 2019 9:19 pm

Air duct?

RDFlo · Post by **RDFlo** » Mon Feb 04, 2019 9:25 pm

Should have attached an image for a better understanding.
Apparently, number 1 on the attached image is the air duct.

patriot66 · Post by **patriot66** » Mon Feb 04, 2019 9:56 pm

Number 6 is clipped on the bottom edge of the radiator and I think the 'airduct' is actually 2 pieces, one either side on the bottom corners of the radiator that angle the air in from the lower radiator grille

GuidoK · Post by **GuidoK** » Mon Feb 04, 2019 10:16 pm

You have the correct part. my car has the same one and

patriot66 wrote: ↑Mon Feb 04, 2019 8:42 pm Is your new undertray exactly the same as the one in your photo ? If so then it is not the correct one for a 2003 2.5i. The part number you quoted is correct but it should look like this jkw3fd.jpg and the same as in this diagram also20190204_193250.jpg

are you sure about that?!? Have you hands on experience?
I'm pretty sure the z4 undertray (part 51717012723) looks like the pic in the TS.
Mine does, and I've had it off at least 50 times.

Chris_D · Post by **Chris_D** » Mon Feb 04, 2019 10:23 pm

Why bother with an undertray? Not having one is the most effective way of telling when ur camcover gasket starts leaking... via the oilspot u will see on the ground which would otherwise be caught by the undertray.

Youre welcome

RDFlo · Post by **RDFlo** » Mon Feb 04, 2019 11:09 pm

GuidoK wrote: ↑Mon Feb 04, 2019 10:16 pm You have the correct part. my car has the same one and
patriot66 wrote: ↑Mon Feb 04, 2019 8:42 pm Is your new undertray exactly the same as the one in your photo ? If so then it is not the correct one for a 2003 2.5i. The part number you quoted is correct but it should look like this jkw3fd.jpg and the same as in this diagram also20190204_193250.jpg
are you sure about that?!? Have you hands on experience?
I'm pretty sure the z4 undertray (part 51717012723) looks like the pic in the TS.
Mine does, and I've had it off at least 50 times.

I have kept bits of the shattered undertray and I just checked. The one I have is the one Patriot66 mentioned. This stuff is really confusing indeed. I vaguely remember now that the 2003 2.5i had a different tray for some unknown reason.
Now where the hell do i find one of those?

RDFlo · Post by **RDFlo** » Mon Feb 04, 2019 11:14 pm

Chris_D wrote: ↑Mon Feb 04, 2019 10:23 pm Why bother with an undertray? Not having one is the most effective way of telling when ur camcover gasket starts leaking... via the oilspot u will see on the ground which would otherwise be caught by the undertray.

Youre welcome

Much appreciated buddy, but fortunately for me, no oil leak. I fixed that a few months ago.

patriot66 · Post by **patriot66** » Tue Feb 05, 2019 9:22 am

GuidoK wrote: ↑Mon Feb 04, 2019 10:16 pm You have the correct part. my car has the same one and
patriot66 wrote: ↑Mon Feb 04, 2019 8:42 pm Is your new undertray exactly the same as the one in your photo ? If so then it is not the correct one for a 2003 2.5i. The part number you quoted is correct but it should look like this jkw3fd.jpg and the same as in this diagram also20190204_193250.jpg
are you sure about that?!? Have you hands on experience?
I'm pretty sure the z4 undertray (part 51717012723) looks like the pic in the TS.
Mine does, and I've had it off at least 50 times.

RDFlo has a 2003 2.5i the same as mine. Mine is the same as the one in my photo and diagram and during my 4 years of ownership I have removed and replaced it MANY times also. RDFlo has now examined the broken parts of his old one and confirms that his is the same as mine

oldgitdave · Post by **oldgitdave** » Tue Feb 05, 2019 8:35 pm

RDFlo wrote: ↑Mon Feb 04, 2019 11:09 pm
GuidoK wrote: ↑Mon Feb 04, 2019 10:16 pm You have the correct part. my car has the same one and
patriot66 wrote: ↑Mon Feb 04, 2019 8:42 pm Is your new undertray exactly the same as the one in your photo ? If so then it is not the correct one for a 2003 2.5i. The part number you quoted is correct but it should look like this jkw3fd.jpg and the same as in this diagram also20190204_193250.jpg
are you sure about that?!? Have you hands on experience?
I'm pretty sure the z4 undertray (part 51717012723) looks like the pic in the TS.
Mine does, and I've had it off at least 50 times.
I have kept bits of the shattered undertray and I just checked. The one I have is the one Patriot66 mentioned. This stuff is really confusing indeed. I vaguely remember now that the 2003 2.5i had a different tray for some unknown reason.
Now where the hell do i find one of those?

RDFlo, I'd be interested in buying the 3.0l M54 underlay from you if it's no good to you & the price is reasonable. Mine's been missing ever since I had it.

Dave

RDFlo · Post by **RDFlo** » Tue Feb 05, 2019 11:29 pm

[/quote]

RDFlo, I'd be interested in buying the 3.0l M54 underlay from you if it's no good to you & the price is reasonable. Mine's been missing ever since I had it.

Dave
[/quote]

PM'd you buddy.

RDFlo · Post by **RDFlo** » Thu Feb 14, 2019 11:29 am

patriot66 wrote: ↑Mon Feb 04, 2019 8:42 pm Is your new undertray exactly the same as the one in your photo ? If so then it is not the correct one for a 2003 2.5i. The part number you quoted is correct but it should look like this jkw3fd.jpg and the same as in this diagram also20190204_193250.jpg
It locates along the front edge in a groove in the bottom of the bumper and is then held up in position with about 8 x self tapping 8mm bolts and spire clips, numbers 3 and 4 in the diagram

Is this tray specific all M54 z4 engines or just for the 2003 2.5 M54?
I'm trying to understand when did bmw changed the design so i can track down a tray more easily.

patriot66 · Post by **patriot66** » Thu Feb 14, 2019 5:00 pm

RDFlo wrote: ↑Thu Feb 14, 2019 11:29 am
patriot66 wrote: ↑Mon Feb 04, 2019 8:42 pm Is your new undertray exactly the same as the one in your photo ? If so then it is not the correct one for a 2003 2.5i. The part number you quoted is correct but it should look like this jkw3fd.jpg and the same as in this diagram also20190204_193250.jpg
It locates along the front edge in a groove in the bottom of the bumper and is then held up in position with about 8 x self tapping 8mm bolts and spire clips, numbers 3 and 4 in the diagram
Is this tray specific all M54 z4 engines or just for the 2003 2.5 M54?
I'm trying to understand when did bmw changed the design so i can track down a tray more easily.

I've just had a look on http://www.realoem.com/ and ALL undertrays from 2.0i N46, all M54 engines and N52 engines have the same part number, 51717012723. Only the S54 engined //M has a different part number. The diagram shown for all undertrays on Realoem is the same as mine and your broken one, however if you put the part number 51717012723 in on Ebay they all come up either new or secondhand as the simpler flatter version without the mouldings on the rear corners that mate up to the anti-roll bar mounts. At some point early on BMW must have simplified the design, kept the part number and not updated the diagrams

There is a brand new one on Ebay for £45

https://rover.ebay.com/rover/0/0/0?mpre ... 3197260706

Z4-forum.com

Z4-forum.com