i put my motor together and i just want to make sure this is ok. It has a lot of compression
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QUOTE (Sidewinder @ Apr 28 2009, 03:36 PM) index.php?act=findpost&pid=774764
Most times when this happens the wrist pin breaks in two, or the rod and wrist pin break out of the wrist pin journal on the piston.
Then the next ones I've seen are where the rods breaks in two. The piston is lodged in the jug and the broken end of the rod rotates busting out the cases.
Was this a stock 08 crank and rod? With the 20mm wrist pin.
Back in the day the 20mm pistons used to snap wrist pins out of the piston wrist pin journal and so the WR conversions with the 18mm wrist pins became more popular. 18mm pins leaves more material on the piston to support the wrist pin. Not saying this is a better option... just some history.
It is possible that a wrist pin clip popped out leading to the wrist pin walking to one side before the pin ripped out of the piston journal. In this case you would want to see how the clips were installed and how they were indexed. I leave the wrist pin clip end gap at 6'o-clock, that way the forces applied to it will push the pin to 3 and 9 o-clock thus locking it in place. If the clip end gap is at 3 or 9 then the forces will collapse the clip leading to it popping out.
IMO... CSI it, and let the parts tell the story....
Keep us posted with the pictures.
i was just read another topic and i saw someone post this:[/b]![]()
Most times when this happens the wrist pin breaks in two, or the rod and wrist pin break out of the wrist pin journal on the piston.
Then the next ones I've seen are where the rods breaks in two. The piston is lodged in the jug and the broken end of the rod rotates busting out the cases.
Was this a stock 08 crank and rod? With the 20mm wrist pin.
Back in the day the 20mm pistons used to snap wrist pins out of the piston wrist pin journal and so the WR conversions with the 18mm wrist pins became more popular. 18mm pins leaves more material on the piston to support the wrist pin. Not saying this is a better option... just some history.
It is possible that a wrist pin clip popped out leading to the wrist pin walking to one side before the pin ripped out of the piston journal. In this case you would want to see how the clips were installed and how they were indexed. I leave the wrist pin clip end gap at 6'o-clock, that way the forces applied to it will push the pin to 3 and 9 o-clock thus locking it in place. If the clip end gap is at 3 or 9 then the forces will collapse the clip leading to it popping out.
IMO... CSI it, and let the parts tell the story....
Keep us posted with the pictures.
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