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Old 06-18-2017, 09:07 PM   #1
David Lee
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Default marking rod and pistons

I am going to be pulling apart a bracket 340 and I am going to re-use the rod and pistons. And I have been told by very knowledgeable people not to use a numbered punch on the rods since they can induce stress risers. What is the best way to make these so they go back into the correct hole?
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Old 06-18-2017, 09:32 PM   #2
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Default Re: marking rod and pistons

Sounds like a BS story. Most factory rods are stamped with a numbered punch and they hold up just fine.
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Old 06-18-2017, 09:52 PM   #3
Lew Silverman
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Default Re: marking rod and pistons

How about one of those electric etching tools you can pick up at Sears or Harbor Freight for less than $20? That would solve the problem of being a little too "heavy-handed" with a punch and ball-peen hammer.
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Old 06-18-2017, 10:21 PM   #4
David Lee
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Default Re: marking rod and pistons

Quote:
Originally Posted by Jason View Post
Sounds like a BS story. Most factory rods are stamped with a numbered punch and they hold up just fine.
Jason, i want to return each piston and rod to the hole they came from, and no mopar rods are not numbered to go into a particular cylinder. And thanks Lew, I will look into that. I was also considering the pens that junk yards use to mark parts.

Last edited by David Lee; 06-18-2017 at 10:22 PM. Reason: thanking Lew
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Old 06-18-2017, 11:50 PM   #5
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Default Re: marking rod and pistons

David: I am surprised....Every 340 production rod I have every seen
is numbered 1 to 8 to Cylinder. Never had a problem stamping including
pistons. Excepting Some Chinese aftermarket stuff (Re: 440 Source rods)
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Old 06-19-2017, 12:00 AM   #6
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Default Re: marking rod and pistons

Quote:
Originally Posted by GTX JOHN View Post
David: I am surprised....Every 340 production rod I have every seen
is numbered 1 to 8 to Cylinder. Never had a problem stamping including
pistons. Excepting Some Chinese aftermarket stuff (Re: 440 Source rods)
Almost all or all of the Chrysler V8s I've taken apart had the rods numbered (subject to old geezer memory). The number was maybe .09"-.12" tall as best as I can remember. I have a 340 on the engine stand, so I'll take a look tomorrow once the rain blows through. I probably wouldn't stamp the rods once the big ends were resized and new rod bolts installed. I think the rod bore only has a .0005" total tolerance on the bore size.
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Old 06-19-2017, 01:08 AM   #7
David Lee
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Default Re: marking rod and pistons

guess I should have been a bit more specific. This engine was built by someone unknown and it is not my engine. It appears to have scat rods and kb pistons. I went down to an auto parts store and bought the pens and was able to mark the piston tops.
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Old 06-19-2017, 03:46 PM   #8
John Dinkel
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Default Re: marking rod and pistons

Magic marker.
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Old 06-19-2017, 11:52 PM   #9
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Default Re: marking rod and pistons

Dave,

Clean the area with lacquer thinner. Put dab of dykem on them, use a scribe to make the #. Been doing it for years stays on a long time.
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Old 06-20-2017, 03:04 AM   #10
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Default Re: marking rod and pistons

thanks for the idea
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