I was driving my 1999 3.5L 300M when steam started coming out of the engine compartment and I immediately pulled over and turned off the motor. After waiting about 45 minutes, I tried to restart it and it was obvious that the engine was spinning too freely. I didn't get any noises that were really concerning me but I figured out later that the timing belt had broken.
My question - since there have been no obvious signs or sounds of valves hitting pistons and the I can turn the crank and the cam shafts fairly easily (I have the front of the engine taken apart to replace the timing belt), what are the chances I have not bent any valves?
You'll have to do a compression test in order to be sure that no valves were bent. You should have heard if a valve wold have hit a piston.
By the way: I can't hear pistons hitting valves when a timing belt breaks. it is not loud enough. It usually just bends some valves a little. The only one I saw where it can be heard is on a Kia 4cyl. where the valves actually BREAK off. clattering around sounding like broken glass until the engine comes to a stop. (for the last time.)
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