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Cracked piston pin bosses

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Jethro
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Cracked piston pin bosses

Post by Jethro » Wed Nov 24, 2010 8:50 pm

Not sure if this is a common find or not, I searched the forum and couldn't find anything about it. I hope these pics come through. What does the 5 inside of this standard piston mean?

Jethro
Attachments
IMG_0924.jpg
IMG_0922.jpg
IMG_0929.jpg
IMG_0925.jpg
Last edited by Jethro on Thu Nov 25, 2010 12:53 am, edited 4 times in total.
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LOUD MOUSE
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Re: Cracked piston pin bosses

Post by LOUD MOUSE » Wed Nov 24, 2010 9:00 pm

Nothing there. .............lm

Jethro wrote:Not sure if this is a common find or not, I searched the forum and couldn't find anything about it. I hope these pics come through. What does the 5 inside of this standard piston mean?

Jethro

[/img/Users/JeffHahlbohm/Pictures/iPhoto Library/Originals/2010/Nov 23, 2010/IMG_0925.JPG

[img/Users/JeffHahlbohm/Pictures/iPhoto Library/Originals/2010/Nov 23, 2010/IMG_0922.JPG

[/img/Users/JeffHahlbohm/Pictures/iPhoto Library/Originals/2010/Nov 23, 2010/IMG_0929.JPG
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Jethro
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Post by Jethro » Thu Nov 25, 2010 12:47 am

Sorry that was my first attempt at that feature. Got a couple of pics up this time.

Jethro
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jensen
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Post by jensen » Thu Nov 25, 2010 2:25 am

Hi,

No info about the 5, but I have seen these cracks more then once, sometimes (mostly) they will run to the piston floor. The strangest thing is that the cracked piston is found mostly om the right side by me.

Jensen
assembly of Japanese motorcycles requires great peace of mind (Pirsig)
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LOUD MOUSE
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Re: Cracked piston pin bosses

Post by LOUD MOUSE » Thu Nov 25, 2010 7:57 am

It is a mold identifier.
Can ya send that piston to me?. ..............lm

Jethro wrote:Not sure if this is a common find or not, I searched the forum and couldn't find anything about it. I hope these pics come through. What does the 5 inside of this standard piston mean?

Jethro
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Jethro
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Joined: Fri Dec 25, 2009 1:26 am
Location: Helena, Montana

Post by Jethro » Thu Nov 25, 2010 3:20 pm

Sure LM, I'll get it in the mail some time next week. Any significance?, or just wanting to take a gander? So one of the pistons from this engine has both bosses cracked and the other piston has just a small hairline in one boss. I am assuming that these pistons are useless. What causes the cracks?

Jethro
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LOUD MOUSE
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Post by LOUD MOUSE » Thu Nov 25, 2010 4:35 pm

I would really like to look at both pistons for sure.
Were the pins difficult to remove?. ..........lm

Jethro wrote:Sure LM, I'll get it in the mail some time next week. Any significance?, or just wanting to take a gander? So one of the pistons from this engine has both bosses cracked and the other piston has just a small hairline in one boss. I am assuming that these pistons are useless. What causes the cracks?

Jethro
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