YOUR RESEARCHUnderdrive Pulleys
1 matching discussions were examined; no attributable action/outcome evidence was detected. No consensus or repair conclusion is claimed.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Read captured repliesInsufficient extracted evidence does not mean there is no answer in the original discussions.
1 matching discussions · 3 captured posts examined · 1 partial discussions
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.
3 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T113718Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
How many of you have installed one? I've read that some (maybe all?) of the pulleys available for the 987.1 requires that one shaves off a small nub on the engine block (it's a raised protrusion that is hollow and has a notch for a TDC lock)... is this the case with all of the upgraded underdrive pulleys? If not, which are designed to avoid this surgical procedure? Thanks in advance.
The short answer is yes you have to grind off the boss. I suggest you search on this topic. There are a ton of posts. May even be a how to do it article. I did it on my 07 CS many moons ago and it was pretty easy.
What he said!
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