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Rod Bearing Clearance Measuring

Practical Engine Building

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Discussion and questions related to the course Practical Engine Building

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Does inserting the dial bore guage damage the rod journal bearing?

Even the most expensive high range bore gauges leave marks which you shouldn't be able to feel with the simple finger nail test - which is the 'ok' test. It is mentioned in one of the practical engine building videos that you can use the reverse side of emery paper after. I have heard of engine builders reporting no problems after pulling an engine apart after race season and checking the bearing marks.


Yes, as Remly has mentioned, the marks can be cleaned up with the back side of some emery paper and a light lubricant. Some of the better bore gauges use teflon buttons which tend to be a little gentler on the bearing surface but will still leave some light marks.

Do u know if mitutoyo offer these teflon button anvils? Mitutoyo parts are hard to look for on the Internet

Rather than starting a new thread, I'm hoping the last question asked would be answered. I can't find any Mitutoyo teflon button anvils, but their website is a pain to navigate. I'm looking for the PN of a good quality dial bore gauge to get myself (I typically go Mitutoyo, but I'm open to other brands like Insize, Starrett, etc) that I can get the teflon button anvils for. I couldn't find the PN for the Insize one used in the videos.

I have found that with abit of care the mitutoyo bore gauge is faily good with the marks it leaves behind. I have not really bothered looking for the Teflon button anvils

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