Stock Problems/Issues Discussions related to warranty related issues and repairs, or other problems with the OEM parts and software for MINI Clubman (R55), Cooper and Cooper S(R56), and Cabrio (R57).

Cylinder 3 misfire

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  #51  
Old 12-09-2021, 06:32 PM
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Originally Posted by thefarside
From what I can glean from an online search the damage shown is a classic case of detonation caused failure.

Suggest you either replace or have your injectors professionally cleaned.

Curious why you have chosen 9.5 pistons.
I actually bought 10.5s. Can you point me to the articles on the injectors?
 
  #52  
Old 12-12-2021, 05:18 PM
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Im still waiting for my pistons to come in. I bought a bore measuring tool and confirmed the bores are in good shape. A couple of questions while I'm waiting if you don't mind...

- I'm going to hone the cylinders. Should I do anything to protect the oil squirters? I was thinking about putting a piece of tape on the three honing blocks that represent the depth prior to going too deep.
- How do I remove the pins that connect the piston/rod? Are they press fit? Do I just use a socket to push them out?
- Do you heat the rod before pressing them in?
 
  #53  
Old 12-16-2021, 10:54 AM
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I just got off the phone with Carrillo. I ordered their 7515 pistons. The guy on the phone recommended I send the block to the machine shop to have it honed. He said the piston/ring setup is too high tolerance to do the honing at home. Does anybody have experience here?

If I stepped away from the Carrillo pistons and bought stock pistons, could I hone the cylinders using a local auto parts store honing tool?

Thoughts much appreciated!
 
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