Undertray fixings

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TJS
Joined: Mon 12 Sep, 2005 19:05
Posts: 474

  Z1 roadster

Undertray fixings

Post by TJS »

I can't track down a part number for the coarse threaded brass chassis inserts for the rear undertray torx fixings (item 12 in the link). The usual problem; the insets unscrew and wear rather than the torx stud. Do I need to track down similar size generic M6 rivnuts ? If so recommendations welcome !

https://www.realoem.com/bmw/enUS/showpa ... Id=51_1857

Alternatively not sure if the "M8 blind rivet nut flat headed" part no 41132291403 and hex bolt with washer (07119915082) used to attach the floor to the chassis will work. (Items 5 & 12)

https://www.realoem.com/bmw/enUS/showpa ... Id=41_0333

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a1z1
Joined: Tue 04 Sep, 2007 20:43
Posts: 149

  Z1 roadster
Location: Newark

Re: Undertray fixings

Post by a1z1 »

Hi Tj,

You are close.. the part is listed on the diagram number 11.

There are 2 sizes
41122292143 uses 4 on the car and is used to hold the handbrake onto the floor.
41622290686 Receives the bolts that hold the undertrays and sill panels on.

Regards,

Ivor
________________
1990 Red Z1 (Gone back to the motherland)
1991 Green Z1 (stolen by the wife)
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TJS
Joined: Mon 12 Sep, 2005 19:05
Posts: 474

  Z1 roadster

Re: Undertray fixings

Post by TJS »

Many thanks Ivor,

A set of the correct sized "threaded plugs" have been ordered from BMW Germany @ £7.50. The respective Torx screws are no longer available from BMW but generic stainless studs and washers are widely available.

Cheers

TJS
TJS
Joined: Mon 12 Sep, 2005 19:05
Posts: 474

  Z1 roadster

Re: Undertray fixings

Post by TJS »

After 3 months of Z1 body fixing parts being on BMW Germany back order I have finally got around to putting the car back together.

The Z1 workshop manual wants you to insert repair helicoils into the fibreglass before screwing in the brass threaded plugs. No need, BMW have increased the external diameter of the plugs by 3 mm which should be sufficient when screwed and cemented into place. I used JB weld and let it cure for 24 hours. New black stainless steel hex cap screws and washers with low tack thread lock complete the task

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