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Old 04-28-2004, 04:42 PM   #1
freded OP
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Joined: Dec 2003
Location: New Mexico
Oddometer: 174
Need your opinion on this piston

I am in the process of rebuilding a KRS. Bought an engine and it wasn't exactly what was represented so took it completely apart and am rebuilding it. This piston was either dropped or something was dropped on it. So question is it good enough to be used or should I buy a new one?
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Old 04-28-2004, 05:07 PM   #2
Gutless wonder
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Joined: Feb 2002
Location: Tempe AZ, USA
Oddometer: 4,924
Just follow the basic rule in life when cooking, wrench'n, etc...

"When in doubt... Thow it out"
Unless you're a cheap bastard and then you come here to ask questions
Change must come from a barrel of a gun. -- Mao Tse Tung

When governments fear the people, there is liberty. When the people fear the government, there is tyranny -- Thomas Jefferson
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Old 04-29-2004, 06:12 AM   #3
Stuck in the Sandbox
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Joined: Oct 2003
Location: Ft. Myers, FL
Oddometer: 736
The nick seems to be below the sealing/oil rings so you should be okay. I wouldn't use it because I am one anal bast---. The little bit of vibration or unbalance would have me regretting the damn piston as soon as I felt something and would crack it open again to rip it out.

So I would get a new one, but only because I only do the same job once!

Beer will not solve all of your problems, but neither will milk.
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Old 04-29-2004, 06:17 AM   #4
Studly Adventurer
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Joined: Mar 2004
Location: Downeast, Maine
Oddometer: 802
The nick in the body looks acceptanble to me, as long as you remove any sharp edges.

From my screen though, it looks like there is a nick on the upper surface of the top ring groove. If it is in fact a nick, I would reject this piston.
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Old 04-29-2004, 09:10 AM   #5
Rubbery-Lip Flappin' PHI
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Joined: May 2002
Location: Albuturkey
Oddometer: 1,478
If it appears to be a ding from handling I'd use it. Make sure there is no raised area around the ding. (like the rim of a crater) Might need a little work with a riffler and some paper to take that off. Only the lower part of the skirt runs on the bore, some fancy pistons have even eliminated the area where your ding is located.

If, on the other hand, it appears to be a void from a casting, I'd be more wary.

When pistons fail, it is usually at the crown, or the ring grooves. Only if they were porly fitted, or EXTRAMLY worn will you ever see a skirt failure.
Sincerity is the most important thing. Once you learn to fake that, the rest is easy.
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