pulled a 2011 cc 2.0 turbo engine apart that had been run though water, the engine would run, but miss firing and making noise,  pull the head off and found a ball bearing in one of the pistons,  the head and pistons were pinged up on 3 cylinders though,  puzzled on how this ball bearing got in there,  turbo is intact, air filter and turbo pipes and innercooler had water but no damage

pulled a 2011 cc 2.0 turbo engine apart that had been run though water, the engine would run, but miss firing and making noise,  pull the head off and found a ball bearing in one of the pistons,  the head and pistons were pinged up on 3 cylinders though,  puzzled on how this ball bearing got in there,  turbo is intact, air filter and turbo pipes and innercooler had water but no damage

Is the ball bearing intact ?  Nice and round ?   If not, maybe its not a ball bearing. I pulled the head off a 2.0 Type-4 and found What thought was a ball bearing. Got to looking at it under a mag. glass . It turned out to be a nut when I spotted the remains of some threads. That nut had traveled to all 4 cyl's and beat up the pistons. The nut ended up nice and round.

That is wierd.... 


I know some of the oil galley passageways are capped off by round, bearing looking guys and then the end is peened over... maybe it's one of those from the head or something... 

i think it had something to do with driving though water, i should have grabbed some picture, i had to put the engine back together for core