Damage wrist pin?
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Damage wrist pin?
What would cause this? PBM Piston PBMPF4040550
Only pin with this issue.
Only pin with this issue.
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Re: Damage wrist pin?
Just plain bad metallurgy?
If that’s pitting then I would expect to see those small particles loaded into the wrist pin bore.
Is that the case?
That looks to be the area on the pin where the oil ring groove has a drain hole going to.
Was any polishing or rework done to the pistons and that one drain hole not cleaned out fully?
If that’s pitting then I would expect to see those small particles loaded into the wrist pin bore.
Is that the case?
That looks to be the area on the pin where the oil ring groove has a drain hole going to.
Was any polishing or rework done to the pistons and that one drain hole not cleaned out fully?
You can cut a man's tongue from his mouth, but that does not mean he’s a liar, it just shows that you fear the truth he might speak about you!
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Re: Damage wrist pin?
Looks like corrosion. Most of PBM's pistons are Mahle and I have not seen anything like that.
Bill Koustenis
Advanced Automotive Machine
Waldorf Md
www.enginerepairshop.com
Advanced Automotive Machine
Waldorf Md
www.enginerepairshop.com
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Re: Damage wrist pin?
Looks like corrosion. Most of PBM's pistons are Mahle and I have not seen anything like that. Any chance it was like that from new ?
Bill Koustenis
Advanced Automotive Machine
Waldorf Md
www.enginerepairshop.com
Advanced Automotive Machine
Waldorf Md
www.enginerepairshop.com
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Re: Damage wrist pin?
High quality metal, body and paint work
http://www.spiuserforum.com/index.php?t ... inia.9030/
http://www.spiuserforum.com/index.php?t ... inia.9030/
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Re: Damage wrist pin?
Reminds me of this!
Oxygen, hydrogen, sulfur, sodium and phosphorous walk in to a bar……..
“OH SNaP” says the bartender!!!
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Re: Damage wrist pin?
1 of 16?
Sweat during assembly without lube.
DNA?
Really surprised that pin's bore isn't nasty!
Sweat during assembly without lube.
DNA?
Really surprised that pin's bore isn't nasty!
Re: Damage wrist pin?
Heat treatment scale that possibly did not clean up in the centerless grinding process.