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Old 01-19-2017, 08:50 PM   #1
SeanL15
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Default After rebuild all 4 pistons hitting head?

I have a 2004 WRX, I had spun main and rod bearings. I didn't have the money to scrap the block, crank, and rods so I had them resurfaced. After putting the block back together with original block, pistons and rods, all 4 pistons hit the heads and will only rotate 180 degrees? what can be causing this? the only thing i got new was over sized bearings? Rod bearings were .010 if i remember right?

This is my first rebuild, i am an Aircraft mechanic so i figured i could do it no problem...lol
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Old 01-19-2017, 09:20 PM   #2
Dave D.
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The only thing that makes sense to me is that your pistons are hitting the valves -- did you have the heads done? Sounds like your timing might be a bit off...
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Old 01-19-2017, 10:36 PM   #3
the_saintusa
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How much was machined off the block and the heads?

Stock head gaskets?
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Old Yesterday, 02:08 AM   #4
SeanL15
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stock head gaskets, nothing shaved off heads or block, valves are seated and fine. i never got to setting the timing because i couldn't rotate the engine by hand once i bolted the heads on.

everything is stock except the bearings?

The pistons stick out of the top of the block at TDC. So i can set the heads with gasket on and rotate the crank and it will raise the unbolted head up at each piston position, so it's not 1 stretched rod or anything like that.
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Old Yesterday, 03:28 AM   #5
jamal
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You must have the wrong pistons or rods or something.
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Old Yesterday, 09:41 AM   #6
rtv900
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Whaaat? With ALL the original parts?

Do the pistons have a pop up on them that is off center to one side of the piston that matches the combustion chamber shape on that side??? And maybe you put them in rotated 180 degrees?

If you didn't mill the block or heads and you don't yet have valves in I can't think of any other possibility other than different rods.
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Old Yesterday, 10:15 AM   #7
Mnash50259
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Quote:
Originally Posted by the_saintusa View Post
How much was machined off the block and the heads?

Stock head gaskets?
This^^^
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Old Yesterday, 11:47 AM   #8
2milehi
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Something had to change. Are you certain that they reconditioned the original rods? Usually when bearings spin the crank and rods get pretty trashed.
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Old Yesterday, 11:53 AM   #9
rexworx
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Did the Machine shop give you the wrong crank back when you had it polished?

Might be crazy but maybe they gave you a 79mm stroke crank from a 2.5 that they were also polishing for someone else. Instead of the 75mm crank you gave them.

I know it sounds crazy but its just a random thought.
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Old Yesterday, 03:45 PM   #10
SeanL15
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yep original rods and original pistons? Nobody has been able to figure it out im stuck...
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Old Yesterday, 03:48 PM   #11
SeanL15
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Quote:
Originally Posted by rtv900 View Post
Whaaat? With ALL the original parts?

Do the pistons have a pop up on them that is off center to one side of the piston that matches the combustion chamber shape on that side??? And maybe you put them in rotated 180 degrees?

If you didn't mill the block or heads and you don't yet have valves in I can't think of any other possibility other than different rods.
What do you mean rotated 180 degrees?
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Old Yesterday, 03:49 PM   #12
SeanL15
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Quote:
Originally Posted by rexworx View Post
Did the Machine shop give you the wrong crank back when you had it polished?

Might be crazy but maybe they gave you a 79mm stroke crank from a 2.5 that they were also polishing for someone else. Instead of the 75mm crank you gave them.

I know it sounds crazy but its just a random thought.
I will have to check into that, thanks!
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Old Today, 08:06 PM   #13
subaru_gc8
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im voting on the crank, it seems to me that your stroke has changed...
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