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YOUR RESEARCHReplacing bolts ?? Help
Reported or suspected cause
only fasteners not made in the usa or india
Suggestion or failed attempt
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Read evidence and context
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Suspected cause
Coming from Sweden they are probably the only fasteners not made in the USA or India.
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Suggestion
I know this wont sound quite that obvious but you do need to be careful which bolts you replace with stainless, A2 is usually car grade however most stainless does not have the tensile strength of steel bolts and although a4 marine might sound the best the extra chromium increases the likelyhood of fatigue if there is no movement A2 is fine also consider galvanic corrosion on that basis it is worth checking the strength of the bolts that are coming out particulalry the turbo and manifold ones
Leading evidence: 'only fasteners not made in the usa or india' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'only fasteners not made in the usa or india' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check strength of the bolts' (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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Suggestion
I know this wont sound quite that obvious but you do need to be careful which bolts you replace with stainless, A2 is usually car grade however most stainless does not have the tensile strength of steel bolts and although a4 marine might sound the best the extra chromium increases the likelyhood of fatigue if there is no movement A2 is fine also consider galvanic corrosion on that basis it is worth checking the strength of the bolts that are coming out particulalry the turbo and manifold ones
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
1
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Suggestion
most automotive sizes are m5 m6 and m8, m8 being 13 mm,I had wanted to change the turbo to manifold nuts which are M8 to copper coated steel but in the end went for porsche due to time constraints
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.
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Suggestion
Perhaps the best bet is to use GOOD quality alloy steel fasteners with a good zinc or nickel coating and cover them in copperslip.
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.
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Check strength of the bolts
No successful repair reported for this finding.
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Reported fixes
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Unsuccessful attempts
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Discussions
Read evidence and context
Discussions that contain suggestions
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Suggestion
I know this wont sound quite that obvious but you do need to be careful which bolts you replace with stainless, A2 is usually car grade however most stainless does not have the tensile strength of steel bolts and although a4 marine might sound the best the extra chromium increases the likelyhood of fatigue if there is no movement A2 is fine also consider galvanic corrosion on that basis it is worth checking the strength of the bolts that are coming out particulalry the turbo and manifold ones
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
most automotive sizes are m5 m6 and m8, m8 being 13 mm,I had wanted to change the turbo to manifold nuts which are M8 to copper coated steel but in the end went for porsche due to time constraints
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8 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Porsche Club GB: 1 discussions
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Generation: 20261027T025149Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi all,
I am in the process of choosing a new, sportier exhaust for my 996 Turbo.
As part of this, I would like to replace as many bolts as reasonably and practically possible with Stainless Steel versions.
Is there a diagram or list anywhere of all the bolts around the exhaust, heat shields, turbos etc and their sizes ?
Thanks
I don't know if I am being a little dense but I have just looked at the PET manual and it doesn't say what sizes I need.
For example, on PDF page 60 which shows the exhaust, part no 7 which is the bolt that fixes the exhaust cat to the turbo, is just described as 'lock nut' - how am I meant to source an equivalent stainless steel version without knowing the size of the nut ?
Also, on PDF page 62, I cannot tell how the Turbo Heat Shield (part 14) is attached the Turbo unit. I can see it goes through a stud (part 29) but not what is secured at the end of the stud ?
Any help/guidance ?
I often use here:-
http://www.deroure.com/diagrams.asp?MAK=3&SMA=0&SMO=0&ST=&SC=0
Parts diagrams are zoomable and the current OPC prices are displayed along with any bolt sizes etc.
I know this wont sound quite that obvious but you do need to be careful which bolts you replace with stainless, A2 is usually car grade however most stainless does not have the tensile strength of steel bolts and although a4 marine might sound the best the extra chromium increases the likelyhood of fatigue if there is no movement A2 is fine also consider galvanic corrosion on that basis it is worth checking the strength of the bolts that are coming out particulalry the turbo and manifold ones
most automotive sizes are m5 m6 and m8, m8 being 13 mm,I had wanted to change the turbo to manifold nuts which are M8 to copper coated steel but in the end went for porsche due to time constraints
2 articles which might help
http://www.volksbolts.com/faq/basics.htm
http://donsnotes.com/home_garden/bolts.html
for stainless bolts/nuts etc i have found these two companies on ebay to be competitive
http://stores.ebay.co.uk/Aruncas?_trksid=p2047675.l2563
http://stores.ebay.co.uk/A-BOLT-FTB?_trksid=p2047675.l2563
for a slightly wider and more specialist selection i found these guys helpful
http://www.accuscrews.co.uk/17-precision-hardware all no afilliation
good luck
Hi
Richard is spot on. Watch for corrosion between the stainless steel and the surrounding non stainless steel components. Also, A2 grade fasteners will crevice corrode in short order in the hot, damp conditions encountered around an exhaust system. There are some stainless fasteners that are up to the job but they are expensive and not particularly easy to find. Try TR fasteners and ask them for Bumax Fasteners in the sizes you need. These are equivalent to 10.9 grade steel fasteners so should be strong enough and are made from 316 grade stainless steel, which is marine grade. From memory, they are only available in hex socket cap head form, but I might be wrong because that is all we use on the boats.
Be prepared to pay for them. If you think Porsche parts are pricey then you'll get a real wake up call. You might also have to wait for them. Quality doesn't come cheap and these are about the only fasteners that are guaranteed 100% defect free. Coming from Sweden they are probably the only fasteners not made in the USA or India.
Perhaps the best bet is to use GOOD quality alloy steel fasteners with a good zinc or nickel coating and cover them in copperslip.
Regards
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