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Old 07-14-2011, 08:15 PM   #1
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Blown head gasket, only to find pistons upside-down...

The picture says it all... Where do I go from here? The valves don't look bent but should I pressure test them? I have to pull the motor and swap the pistons around; will I have to re-hang the rods so they can all go back into the same bores?
Click the image to open in full size.
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Old 07-15-2011, 12:24 AM   #2
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Re: Blown head gasket, only to find pistons upside-down...

Getting the heads checked would be a good idea. Honing and re-ringing should be enough to swap the pistons from side to side.
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Old 07-15-2011, 12:12 PM   #3
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Re: Blown head gasket, only to find pistons upside-down...

What about the rod offset?
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Old 07-15-2011, 12:32 PM   #4
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Re: Blown head gasket, only to find pistons upside-down...

They're aftermarket pistons, I doubt they have a rod offset.
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Old 07-15-2011, 12:36 PM   #5
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Re: Blown head gasket, only to find pistons upside-down...

Is a re-ring imperative? The motor has less than 4k miles on it.
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Old 07-15-2011, 12:38 PM   #6
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Re: Blown head gasket, only to find pistons upside-down...

The rings are broken-in to the cylinders they're in now. They won't seal in different ones.
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Old 07-15-2011, 12:41 PM   #7
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Re: Blown head gasket, only to find pistons upside-down...

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Originally Posted by ronnjonn View Post
What about the rod offset?
Ahhh ok, I see what you mean... yeah, they'll probably have to be rehung.
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Old 07-15-2011, 12:53 PM   #8
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Re: Blown head gasket, only to find pistons upside-down...

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Originally Posted by Apeiron View Post
Ahhh ok, I see what you mean... yeah, they'll probably have to be rehung.
I'm willing to bet the guy who put the motor together put half the pistons in wrong... won't know 'til I pull it.

http://www.jepistons.com/TechCorner/Pin-Offset.aspx

The pistons did seem really loud when cold.
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Old 07-15-2011, 01:01 PM   #9
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Re: Blown head gasket, only to find pistons upside-down...

Those pistons probably don't even have pin offset. The problem is the connecting rods. They have a side that has to face the other rod on the pin, and a side that faces the crank throw. Essentially you need to turn the piston 180 degrees without turning the rod, which can't be done without taking the rods off.
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Old 07-15-2011, 04:22 PM   #10
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Re: Blown head gasket, only to find pistons upside-down...

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Originally Posted by kerplunk318 View Post
I'm willing to bet the guy who put the motor together put half the pistons in wrong... won't know 'til I pull it.
I'd be having a little chat with that guy.
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Old 07-15-2011, 06:14 PM   #11
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Re: Blown head gasket, only to find pistons upside-down...

Thats just bad workmanship. you can clearly see were the valve was contacting the piston, so they are most likely damamged in one way or another. Best thing to do would be to pull each rod/piston assembly at a time, pull the piston off the rod, and rotate it 180 degrees. then reinstall with new spirolocks on the pins. and i would most def have the heads checked out for bent/damaged valves.
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Old 07-15-2011, 06:14 PM
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