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Old 09-23-2017, 05:52 PM   #1
mfsuper90
 
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Cummins piston wrist pin height

I've searched a lot and came up with nothing. Can some one help me out with wrist pin height (crown to pin centerline) on a 6.7 QSB piston and the less common 4.1" bore 6.7 that was used in Ag equipment?

Thanks in advance
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Old 09-24-2017, 01:14 PM   #2
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Smoke has piston prints posted on here. I think it was something like 69-71mm IIRC.
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Old 09-24-2017, 01:38 PM   #3
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Old 09-24-2017, 06:57 PM   #4
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Much appreciated! I couldn't find that info for the life of me, very helpful.

Thanks again,
Eric
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Old 09-25-2017, 05:10 PM   #5
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69.4mm for both, Photobucket has become even more useless, I didn't think that was possible.
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Old 09-25-2017, 06:22 PM   #6
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Thanks smokem, I appreciate the help.

Is the 4.1" bore an actual cummins engine or is it the iveco/caseIH/ new holland counterpart?
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Old 09-26-2017, 01:38 PM   #7
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It was produced by Cummins and used in a few different applications, I had a good bit of info on the piston some time ago, but I do not recall where it is now. Referencing the pin location, the same value represents both 4.21" versions, I believe the smaller bore had a different compression height.
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Old 09-26-2017, 01:47 PM   #8
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Quote:
Originally Posted by Smokem View Post
I believe the smaller bore had a different compression height.
Along with a 38mm pin. I can picture the post where you put the info, I know it's on here somewhere. I've had those pistons in my hands on several occasions, I probably wrote it down somewhere where I was sure I'd remember it......
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Old 09-26-2017, 02:00 PM   #9
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Quote:
The pin is 38mm vs 40mm that is standard, bowl is 52mm wide and 25mm deep.

Compression distance;

12v/24v 5.9L ~ 71mm
24v 6.7L ~ 69mm
12v 6.7L ~ 63mm
...
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Old 09-26-2017, 02:12 PM   #10
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Quote:
Originally Posted by 9724VF350 View Post
I probably wrote it down somewhere where I was sure I'd remember it......
This describes my life.
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