I'm in the middle of the first year engine class at MassBay's BMW program, and I recently got to tear down an over-revved S54.
Pretty much all of the intake valves are fubar, and some of the exhaust valves are damaged a little also. Some valves bent so far out of place that they collided with the top of the piston, never making it down the extremely deep valve reliefs. A few of the shims that normally sit on top of the valve retainers were just bouncing around above the oil drain passages in the head. The force of the piston-to-valve contact sheared all the bolts off of the intake cam's sprocket that connects to the Vanos. Thought I'd share...
Pretty much all of the intake valves are fubar, and some of the exhaust valves are damaged a little also. Some valves bent so far out of place that they collided with the top of the piston, never making it down the extremely deep valve reliefs. A few of the shims that normally sit on top of the valve retainers were just bouncing around above the oil drain passages in the head. The force of the piston-to-valve contact sheared all the bolts off of the intake cam's sprocket that connects to the Vanos. Thought I'd share...
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