Always tighten your crankshaft pulley bolt up to specs!

otherwise this happens to your crank keyway and crankshaft sprocket...

http://i97.photobucket.com/albums/l2...R/DSCF1565.jpg

http://i97.photobucket.com/albums/l2...R/DSCF1566.jpg

that's almost one tooth of play in either direction as a result of that damage. I rebuilt the engine 20,000kms ago and it seems I didn't tighten the crankshaft pulley bolt up to the correct torque (which is 195Nm if you were wondering)

I only discovered it after I had to remove the cambelt

http://i97.photobucket.com/albums/l2...R/DSCF1562.jpg

to remove the upper 'cam tray' from the front cylinder bank

http://i97.photobucket.com/albums/l2...R/DSCF1551.jpg

in order to replace a tappet, which due to the inferior design does this

http://i97.photobucket.com/albums/l2...R/DSCF1557.jpg

when it's meant to look like this

http://i97.photobucket.com/albums/l2...nt/tappets.jpg

which you can only replace it by accessing the underside of the cam tray

http://i97.photobucket.com/albums/l2...R/DSCF1554.jpg

http://i97.photobucket.com/albums/l2...R/DSCF1556.jpg

so yeah.. I fixed one problem only to discover a major problem. looks like the crank is going to come out to be repaired :(