I've been noticing a rattle sound under the hood when I start in the AM. I can also make it rattle by holding 1000-1200 RPM. Haven't poked my head under the hood yet. It's been doing it for a while now. I am at 182K miles. Sounds like a heat shield or something. Anybody else? It doesn't sound like anything serious which is why I'm dragging my feet.
How do you replace a heat shield when it's so rotten around the bolts that it's falling off and the bolts are so rusted in that you'll break them before you ever get them out? Guess they could be ordered through the dealership but I don't know how they'd be fastened. The heat shield by the turbo would be fine but anything under the car would be impossible to replace. I'll get some pictures of vehicles where I live and show you what I'm talking about.
It only happens at a 1000-1200 RPM. Slower or higher than that it's silent. It's apparently set up by a certain vibration frequency. I'll eventually get under there and poke around. I was mainly curious if any other diesel owners have ever heard this. Once I find out, I will report back, but it's not a really high priority. It's been doing it for a few weeks. I will probably investigate when I do the next oil change.
Find anything?
I watched the video a couple times. It sounded to me more like a high frequency rattle than a bearing. The narrow rpm range that causes the symptom also would seem to support a rattle.
That's my free, internet diagnosis.
Nope. It really sounds like a heat shield or something. It's been doing that for thousands of miles so i am not too worried about it. I will poke around under there when I change my oil next time.