Hi, i just did a quick write up on doing the cam ledge replacement since there is zero info online. Once your in there its pretty straight forward and i want to give a special thanks to http://www.bimmertoolrental.com
for their help and guidance and tool. If youre unfortunate enough to have this issue this diy should help you.
Full description coming soon
Thing you'll need
Cam timing tool --> http://www.bimmertoolrental.com
Timing rail tensioner p/n 11317584723 $39.37 d$36.58
Intake bearing ledge p/n 11127550913 $54.81 d $55.54
Exhaust bearing ledge p/n 11127531224 $61.00 $d 50.92
Collar screw p/n x2
Rectagrind intake p/n x2
11317587757 $5.62 $3.55
Rectagribd exhaust p/n x2
Put the car on TDC the way i learned was taking sparkplug 1 off put a long screw driver and turn the crank on neutral until the screw driver is at its highest point. Install the tdc pin on the drivers side of the block (remove plastic plug)
To make sure you're on TDC make sure that the last rear lifters are not compressed by the cam lobes ( check the drawing from a couple pics below)
Install the tdc pin drivers side of the block pull the oem plug.
Release the timing tensioner 27mm. Remove the cam gear bolts and vanos plates. With a marker mark the teeth to the chain and zip tie chain to gears.
Remove vanos plates these are interchangeable but i marked them anyways
After removing all top bolts remove one ledge at a time.
Picture of the medal hook rings. New ones are made out of teflon and just slide in
Install the new rings into the cams before installing them into the new ledges use engine assembly oil into every friction parts.
Lower each tray plus cam into location start bolts and tighten them one turn at a time evenly to avoid breaking anything.