The Tdi is noticeably smoother and quieter after a recent valve adjustment, and after advancing the timing.
However, now I'm finally able to really hear the ringing noise I've been trying to track down for some time. To preface -- when I hear valves clack, they "clack". When the knock on the 2.25 in the Series was hardly pin drop, I knew what I was hearing right away. And as it developed, it had the sound of "knocking" on hardwood. When the V8 used to clack because of low quality, or low octane fuel, that's exactly what it sounded like; it had a "thin clack".
What I'm hearing is a distinct, repetitive ring.
Now that the engine is running so smoothly, and therefore quieter, I was able to catch it on video. I'm sure you'll hear it, but in the video is sounds a bit more like just a tap-tap-tap. In real life, that tap is a metallic ring.
https://flic.kr/p/GC1EFt
It is pretty clearly coming from the front of the engine. In fact, I used to only be able to hear it by bending down in front of the radiator. But I can't seem to be able to pin-point it with a stethoscope, except for at the thermostat housing!
However, now I'm finally able to really hear the ringing noise I've been trying to track down for some time. To preface -- when I hear valves clack, they "clack". When the knock on the 2.25 in the Series was hardly pin drop, I knew what I was hearing right away. And as it developed, it had the sound of "knocking" on hardwood. When the V8 used to clack because of low quality, or low octane fuel, that's exactly what it sounded like; it had a "thin clack".
What I'm hearing is a distinct, repetitive ring.
Now that the engine is running so smoothly, and therefore quieter, I was able to catch it on video. I'm sure you'll hear it, but in the video is sounds a bit more like just a tap-tap-tap. In real life, that tap is a metallic ring.
https://flic.kr/p/GC1EFt
It is pretty clearly coming from the front of the engine. In fact, I used to only be able to hear it by bending down in front of the radiator. But I can't seem to be able to pin-point it with a stethoscope, except for at the thermostat housing!