Broken cylinder block bolt

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Oct 10, 2025 | 11:21 AM

#21

Callisto

Senior Member

Joined: Oct 2018

Posts: 10,665

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From: Northern California

Quote:

Originally Posted by meinbills

I am located in the Midwest.

It's a long bolt so I think 2 feasible ways of getting that broken bolt out. One is to drill and tap a left hand threaded hole into that bolt and use another bolt fitting into that hole to remove it. Two, to weld another bolt onto that broken bolt and use it to turn the broken bolt out. There are some vids out there that show a few ways to remove broken bolts like this.

In any case, dealership would charge $200 for "diagnosing" if they didn't get the job. In conclusion, they got the job and life moves on.

Ok well "midwest" is vague so I cant look up basic labor rates? And there is no way I can find what I would think is a qualified shop that could better do the service based on experience.

Your 2 ideas while they are good thoughts will likely not work and may cause damage to the lower crankcase. Re -read my last response and you will understand why?

If the shop you decided to attempt the repair I would request pictures of the finished R&R of the stud before they install the oil pan.

Last edited by Callisto; Oct 10, 2025 at 11:24 AM.

Oct 10, 2025 | 12:23 PM

#22

meinbills

Thread Starter

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Joined: Oct 2025

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True it's a good idea to get a picture. In any case, Mazda dealership will take care of it and it doesn't matter now. What I'm still not getting is how could that bolt break! Mazda.

Case closed.

Oct 10, 2025 | 01:06 PM

#23

Callisto

Senior Member

Joined: Oct 2018

Posts: 10,665

Likes: 233

From: Northern California

Quote:

Originally Posted by meinbills

True it's a good idea to get a picture. In any case, Mazda dealership will take care of it and it doesn't matter now. What I'm still not getting is how could that bolt break! Mazda.

Case closed.

I suggested that you take specific pictures. Preferably high definition. Then I will have at least 80& indication (based on a picture not physically examining and testing the parts) as to the cause. While I have never used it on any vehcle forum, I do have a certification in Aircraft Structural Analysis. LOL

Another suggestion is to ask for the stud returned when they remove it and not loos the nut. I also forgot to mention to have them take a picture of the surface of the lower crankcase after they remove the stud. These are both very important.

The case is closed when your Mazda is returned and running!