How to measure bearing clearances
Thread Starter
Joined: Apr 2010
Posts: 2,816
Likes: 86
From: Instagram @chevyhotrodder
How to measure bearing clearances I have been thinking about buying an inexpensive bore mic and set of outside micrometers for measuring my rod & main bearings & journals. I also have some plastigage, but I've read mixed reviews on how accurate it is. Would an inexpensive set of measuring tools be adequate for the job? Or are these too inaccurate for this job?
I was thinking this dial bore mic (+/- 0.0005):
http://amzn.com/B006C6212Q
And this or similar mic set (+/- 0.0001)
http://amzn.com/B000YBACNA
This video demonstrates how to use these
http://youtu.be/gjN0fGfUzl0
The bore mic accuracy worries me a bit. Would it be better to use a telescoping gauge like the one below, pull it out and measure it with the same mic as the bearing journal?
http://amzn.com/B004Q7PTYU
Any advice is appreciated.
I was thinking this dial bore mic (+/- 0.0005):
http://amzn.com/B006C6212Q
And this or similar mic set (+/- 0.0001)
http://amzn.com/B000YBACNA
This video demonstrates how to use these
http://youtu.be/gjN0fGfUzl0
The bore mic accuracy worries me a bit. Would it be better to use a telescoping gauge like the one below, pull it out and measure it with the same mic as the bearing journal?
http://amzn.com/B004Q7PTYU
Any advice is appreciated.
You setup the dial bore gauge with the mic you use for the journal measurements, so the accuracy is quite good as the bore gauge is just an offset from the mic. Get both the bore gauge and the mic set and your all set..
That dial bore gage is just as accurate as a Sunnen, it's all in the technique learning how to use any of them. I have one like it and a Sunnen. Go with the .0001" accuracy instead of the .0005" for doing bearings.
Just buy one micrometer big enough to measure pistons and cranks with all the various attachments for different size stuff.
Just buy one micrometer big enough to measure pistons and cranks with all the various attachments for different size stuff.
Thread Starter
Joined: Apr 2010
Posts: 2,816
Likes: 86
From: Instagram @chevyhotrodder
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Thread Starter
Joined: Apr 2010
Posts: 2,816
Likes: 86
From: Instagram @chevyhotrodder
This seems to be the cheapest thing I can find with better than 0.005. This is the same gauge fitted with digital indicator that reads to .00005 for $120
http://amzn.com/B000XYND0M
I think I may give this a try, just need to find a decent mic or two for the crank journals & pistons.
http://amzn.com/B000XYND0M
I think I may give this a try, just need to find a decent mic or two for the crank journals & pistons.
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Verdad Gallardo Found mine on ebay. I don't believe the digital gage will work as good as a dial gage. You have to "rock" the needle to calibrate to your micrometer. Part of the technique!
Thread Starter
Joined: Apr 2010
Posts: 2,816
Likes: 86
From: Instagram @chevyhotrodder
Man, went back to ebay and found a bunch for around $125 that have 0.0001 dial indicators. I would prefer a dial over digital for this application. Like you said you want to rock/tilt and look for the minimum value. Hopefully I can make due with the digital - it does at least have a digital sweep around the top which should act like a dial.
