Re-tapping M8 x 1.25 threads for hot side of Turbo to Downpipe

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#28426
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#1
Hi all,

I recently swapped a 19k-mile stock turbo from a 2015 fiesta ST into my 2017 Fiesta ST with 178k miles. My buddy and I ran into a few issues doing the job, but one of those namely being:
I bought the new downpipe bolts from the dealer (at $12/bolt). We started to try and thread one in once the turbo was in. It would go in a bit, and then stop. We tried to do it more, and it gave us immense resistance. We then pulled it out, and the threads of the bolt were cooked. We ended up going to Home Depot to get some grade 8 M6 bolts with washers and nuts to mount the downpipe to the turbo (without having to use the threads in the turbo), but it won't hold for super long, as they weren't hardened steel, and the washers started to crush themselves.
I will eventually need to replace them, but I feel I will need to re-tap the threads in the turbo. I purchased a titanium coated tap online, but am curious: if I remove the downpipe but leave the turbo in, would I be able to fit a tap in there to clean the threads/re-tap the threads with the turbocharger still in the car? I would prefer not to remove it, as I'd have to spend plenty of time and money to get new gaskets in order to do that. Is it doable without removal?
 


Member ID
#32322
Messages
315
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246
#2
I was curious if you were successful in the swap, sucks about the stud... There should be enough space to get a tap in there with turbo installed. Chasing threads doesn't take a lot of force so if the tap fits you'll be good.
 




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