Loud Knocking Diagnosed - Spun Bearing:(

[Phil Payne]

> I'd plan on replacing the rod that went out.  It is certainly not
round
> any more.  If the big end of the rod isn't round, it won't hold a
bearing
> any time at all.

I wonder if that was the cause this time around.  Or a piece of sh1t
trapped between rod and cap.

> You ought to take all the rods including the new
> replacement rod to a good machine shop and have them checked for
roundness,
> length, and twist.  Since the piston in the bad cylinder was
traveling
> higher in the cylinder, courtesy of the huge extra clearance in the
rod
> bearing, look carefully at the top of the piston to make sure it
wasn't
> hitting the head or valves.

Top piston ring is more likely to be damaged, since it'll be driven up
onto the rim it created itself.  Quite likely to find the top ring
cracked, IMO.

--
  Phil Payne
  http://www.isham-research.com/quattro
  +44 7785 302 803
  +49 173 6242039