I replaced the chain, guides, and tensioner. The engine started up with a rattle on the passenger side valve cover. I imediately shut the engine off. I checked with the local indy shop. He advised me to send the tensioner back and get a MB tesioner. He said he has had the same problem with after market tensioners. I reinstalled the old tesioner until Phil sent a new MB tensioner. All is fine. As previosly stated I would check oil pressure to the tensioner. Are the holes in the gasket lined up and clear to allow oil to reach tensioner? I got lucky and did not damage the valves. Good luck.