I WOULD BET MY NEXT PAYCHECK THAT THAT IS THE CHAINS BEING A TOOTH OFF!!!!!
I promise you that I had the exact same sound on my BMW when I timed it wrong 3 years ago. The timing marks on the BMW sprocket is just a little nick that you line up....problem was I had several nicks in the sprocket :rolleyes: and I picked the wrong one.
I fired it up and it made the EXACT same sound. I checked the sprocket and again thought that I had the right timing nick in position. I decided to drive it around the block like a dumbazz and I broke a valve. It broke an intake valve and then when the piston came back up it pushed the broken half of the valve up through the head. It couldn't be welded either. $600 later I had a new head AND a new sprocket.
The other valves in my engine were all hitting the pistons as well, but they did not bend, only one valve broke because the metal is so damn hard. All six pistons had little valve reliefs hammered into the top of them after that. The machine shop checked the valves and they were all straight except the broken one. I reused them all in the new head, and I have been driving it ever since. I learned a lot from that experience.
My advice is to shut the car down, retime the engine yourself or with someone who will TAKE INSTRUCTIONS from you. Count the links as was suggested and then put it back together. It will be cheaper and it will probably run. Worst case scenario you are out some time and a little RTV gasket material because the timing cover gaskets are reusable.
I find it VERY hard to believ that the lower end on a 2000 motor is subject to piston slap. They are full of shiit. These lower ends will go 200K if they are in stock form.
If I lived near you, I'd do the work for you and only charge you if I was right.
I wish I could help more, but hopefully this insight from my own bad experience will be something you can trust.
good luck
warmonger
