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Old 06-13-2010, 08:25 PM   #1
dexterous
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Default How to identify a 2.5L STI crank shaft?

I have a 100% new crank shaft in my possession that I was told is a USDM STI crank. Is there any way to tell if it is in fact a 2.5L STI crank? It was in a box with the following Subaru part number: 12200AA370 but who's to say that the box was not switched at one point in the past.
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Old 06-13-2010, 08:34 PM   #2
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While it may matter to some, I don't care what 2.5 the crank comes from. A 79mm crank is a 79mm crank. (phase 1 aside).

So....

I put the crank in a block with used bearings, and measure the coming and going. It will either be 75 or 79mm.
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Old 06-13-2010, 09:16 PM   #3
john 1badSTI
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post up some pics from different angles.
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Old 06-14-2010, 10:44 PM   #4
dexterous
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I will get picts when I get home from the business trip that I am on. Is that part number at least an STI crank?
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Old 06-14-2010, 10:47 PM   #5
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Quote:
Originally Posted by dexterous View Post
I will get picts when I get home from the business trip that I am on. Is that part number at least an STI crank?
Yes the "370" is an earlier version before they started nitriding them
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Old 06-15-2010, 11:36 PM   #6
dexterous
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What year does the 370 match up to?
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Old 06-18-2010, 08:09 PM   #7
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Quote:
Originally Posted by dexterous View Post
What year does the 370 match up to?
They started nitriding in 09 (?) so I imagine it would be 04-08.
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Old 06-18-2010, 08:21 PM   #8
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Quote:
Originally Posted by Super Nintendo View Post
They started nitriding in 09 (?) so I imagine it would be 04-08.
I believe it's '08 they started nitriding part number 12200AA400. Have used a couple of them.



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Old 06-19-2010, 10:47 AM   #9
dexterous
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Would this be the item I need to replace the crank in a 2008 2.5L EJ255 bottom end that had a spun bearing? I was able to get a block for basically free but the crank and rods are not so hot.
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Old 06-19-2010, 01:00 PM   #10
Maxwell Power
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as someone said, a 79mm crank is pretty much the exact same as long as it's phase 2.

That crank is a phase 2 and therefore will fit in ANY 2.5L.
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Old 10-30-2010, 06:07 PM   #11
bjm
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Rather than start a new thread I thought I'd post here...

I have a few cranks here that I don't know where they're from. Some will be 2.0 and one should be 2.5. Are there any markings on the cranks that I can use to identify them?

The main one in question has the following marking:
CCBCC IIIZ
373668 C

Any ideas?
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Old 10-30-2010, 07:35 PM   #12
jaxscuby
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those are your main & rod bearing codes..

Quote:
Originally Posted by bjm View Post
The main one in question has the following marking:
CCBCC IIIZ
373668 C

Any ideas?
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Old 10-30-2010, 07:47 PM   #13
bjm
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thanks, I figured the CCBCC and IIIZ were bearing codes but wasn't sure about the 373668
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