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Corrosion on valves - 1999 996 Cab/Tip

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6 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
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YOUR RESEARCHCorrosion on valves - 1999 996 Cab/Tip

Leading reported evidence

Replace engine

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Performed · outcome unconfirmed

I just replaced an engine that broke a rod and have a nice set of heads to scavenge off of it.

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Corrosion on valves - 1999 996 Cab/Tip
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Leading evidence: 'Replace engine' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace engine' (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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Replace engine

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
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.

Performed · outcome unconfirmed

I just replaced an engine that broke a rod and have a nice set of heads to scavenge off of it.

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Corrosion on valves - 1999 996 Cab/Tip
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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.

  • Rennlist: 1 discussions

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Generation: 20261026T174436Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

This concerns a potential replacement engine for my 1999 Cabriolet. Current 3.4 engine has failed and "playing" with a replacement engine, to get it back on the road. Upon tear down of the engine, I noticed that the number 5 cylinder (passenger side, middle cylinder), looks to have corrosion on the valves. The engine was pulled from a working car, but has sat a while. The engine turns over just fine and isn't frozen. The exhaust port also seems to have signs of coolant in the cylinder. 1. Basically, I want to know what your thoughts are on the next steps? All the other valves look great. I am thinking about removing the cylinder head and having it sent out. 2. Should I do both heads? 3. What is a ballpark price to have the heads reworked? I am hesitant to just put it in the car "as is". 4. How difficult is it to remove the heads and reinstall, and keep timing? I can lock the cam in place, with the tool that comes with the IMS retrofit kit. Any questions or advice is helpful.

POST 3Original post

BTW, this is a good read. It's full of info on these heads and what needs to be reworked. https://newsite.hamheads.com/2016/11...age-m96m979a1/

POST 4Original post

I just replaced an engine that broke a rod and have a nice set of heads to scavenge off of it. There is only 53K miles on the engine if you are interested to buy as another option. Otherwise I will likely ebay it.

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