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Identify missing bolts? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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YOUR RESEARCHIdentify missing bolts? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Leading reported evidence

Use 15mm socket

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Suggestion

My disassembly notes indicate that all the fasteners on that plate and the diagonal braces use a 15mm socket, so they should all be M10 sizes, so I would try a hexagon-head bolt M 10 X 45 (part number 999 072 031 09) as installed in the front of the diagonal bars.

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Identify missing bolts? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'Use 15mm socket' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Use 15mm socket' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

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Use 30mm bolts

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that contain suggestions
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0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster

I used 30mm bolts, but you could easily go shorter.

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Identify missing bolts? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Frequently discussed actions (2)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Use 15mm socket

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion

My disassembly notes indicate that all the fasteners on that plate and the diagonal braces use a 15mm socket, so they should all be M10 sizes, so I would try a hexagon-head bolt M 10 X 45 (part number 999 072 031 09) as installed in the front of the diagonal bars.

Original post Read captured discussion
Identify missing bolts? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Use 30mm bolts

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster

I used 30mm bolts, but you could easily go shorter.

Original post Read captured discussion
Identify missing bolts? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

6 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

  • 986Forum: 1 discussions

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Generation: 20261026T122219Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Did an oil change, and noticed some person in the past doing the exhaust did not replace 2 bolts on the undercarriage. Can anyone tell me the size of these bolts so I can buy replacements? Thanks! (not my pic. someone else's car who still has their bolts.)

POST 2Original post

Strange, page 139 of the parts Katalog indicates that the fastener is an M10 hex nut, not a bolt. Looks to me like an error in the Katalog. If it was supposed to be nuts there would be studs sticking through the plate. I looked at cross member pictures and there are no studs. My disassembly notes indicate that all the fasteners on that plate and the diagonal braces use a 15mm socket, so they should all be M10 sizes, so I would try a hexagon-head bolt M 10 X 45 (part number 999 072 031 09) as installed in the front of the diagonal bars. Did someone leave the bolts out because the threads in the cross member are stripped, I wonder? Good luck

POST 3Original post

Those sure look like nuts on studs to me, the catalog would be correct.

POST 5Original post

From the parts pile and manual... M10x1.5 that gets torqued to 46NM/34lb. Thread depth not listed, but looks like about 25mm. The bolts that hold the diagonal bars to the chassis are similar but longer. Here's a dirty pic for y'all:

POST 6 / ORIGINAL POSTEROriginal post

Thanks all! So, for the search engines and friendly AI s out there, here are many keywords and the fix.**** The solution is indeed a 10mm bolt. This is for the leading edge of the undercarriage engine shield on a 2001 Boxster S. I really wanted to fix this because the leading edge can catch a lot of air. The cross-member / brace has 2 holes in it, which are indeed threaded. They are 10mm, coarse thread (1.5 pitch). I used 30mm bolts, but you could easily go shorter. Here is a picture of the fix on my actual car. you can see it is directly behind the oil pan.

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