20 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH996 serious corrosion near front subframe mount
Leading reported evidence
Inspect thoroughly
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
Unsuccessful attempts
1
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Read evidence and context
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Performed · outcome unconfirmed · Original poster
All doused in waxoil type stuff inside, and the rest of the car inspected thoroughly.
Leading evidence: 'Inspect thoroughly' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check area out' (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
Using heat(for welding ) can alter the metalurgy when repairing a car or one could've use substandard parts in doing repairs.
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Suggestion
Those guys know how to keep a car running forever, regardless what it takes.
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Suggestion
Using heat(for welding ) can alter the metalurgy when repairing a car or one could've use substandard parts in doing repairs.
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.
20 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T122219Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Has anyone seen rust like this on a 996?
This is just behind the from right hand side subframe mount. I poked a screwdriver through the damaged underseal when investigating what I thought was surface rust.
This has rotted from the INSIDE out.
The inner skin around the subframe mount appears to be solid, but the outer is gone.
I'd advise everyone to check the area out.
Anyone got an idea of what its going to take /how long / price to fix this? I can't weld.....
No evidence of any accident damage or repair. This just does not seem to happen to the 996! They are hot dip galvanised and are covered in the thickest underseal I've ever seen.
There was no sign of this hole until I started chipping away at the very thick underseal.
The underseal had started to come away at the edges on the bottom, it peeled all the way back and with a little prod this hole opened up.
The inner layer of metal seems to be solid - the hole has opened up where there is a designed hole in the inner skin. Water must have sat here and corroded through, or crept up between underseal and metal.
If you have a mint car it must be worth spraying some cavity wax inside this cavity.
This is UK car used in all year round, on salted roads in the winter.
Since there is a factory hole just behind it, not much water can sit there but salt sure can build up and do this. This will need cutting and wellding and for that, you'll need to remove most of the carpet on that side of the car
The reason why I mentioned accident and UK is I've seen some pretty bad corroded cars coming out of UK. With that said though and as you mentioned, these parts are suppose to be galvanized, hence my accident inquiry. UK is notorious for hack surgeries where they piece together 2 halves from two different cars to make it into one driveable car, all under the radar if you know what I mean. Using heat(for welding ) can alter the metalurgy when repairing a car or one could've use substandard parts in doing repairs. It's these scenerios where I typically see premature or rare rusting attributes on cars like this.
It's just ironic that you have a "rusty996".
Hack jobs are everywhere. North America has just as many as the UK. The real hacks are in the former Eastern Block where people don't make as much money as the well to do countries in Europe. Over here, the real hacks are in Cuba. Those guys know how to keep a car running forever, regardless what it takes.
[Image-only post; no author-written text. Original image references:]
https://cimg6.ibsrv.net/gimg/rennlist.com-vbulletin/614x334/porsche911_7d4089627d570796a47109ab089e6219652f135f.jpg
True...I definitely do not want one of those Cuban "classics" regardless of how friendly we get with Cuba - much of the butchery going on under the hoods, while impressive for sheer creativity, is not undoable.
911s have been fully galvanized (with underbody sealant) since 1976 - and have been rusting before and since then. On my 1980 911SC that had spent its entire life in Southern California and Arizona I had to do rust repairs on a few spots, thankfully just small areas.
The 996s are old enough now that we will start seeing more of this.
The kind of rust I had on my galvanized 911SC was from unwanted moisture collecting in the typical rust areas on 911s. I grew up in SoCal, beach rust (marine air) is not quite the same as the rust you find in the Northeast and Upper Midwest.
I happen to have had a pretty good history on that SC and the SoCal owners weren't beach dwellers.
Also, Northern Arizona gets plenty of snow and magnesium chloride is used in many areas for snow and ice removal/clearing. Northern AZ cars certainly can and do rust (though not as bad as what you might find back east).
Groove is on the right track... I have seen rust here before.
The battery drain comes out into the right front fender. If the battery was boiled on a charger, or otherwise melted down it rusts the crap out of the right front frame rail area. IF a battery ruptures in the cowl, or if the drain is not connected, acid can ruin the cowl area and run down the seams.
All sorted. Took a local coded welder 3 hours or so. He said he had welded up a few boxsters in the same state so rusty cars of this design and generation are not so rare.
Metal was solid around the subframe mount, water / salt must have collected in the hollow at this point and corroded through the outer. It was cut back to good metal, and new metal seam welded in with a stitch to the inner part as per original to retain the properties of the crash structure.
All doused in waxoil type stuff inside, and the rest of the car inspected thoroughly.
There was no need to drop the subframe / fuel tank or remove the carpets.
