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[AllOutFirefighter13]

<span style="color: blue"> Duncan .

Very nice how-to...every time I come across the dreaded serpentine replacement, I seem to read a different way to do it! How were you able to overcome the shortness of the fan wiring? Did you use Greg's advice?

Also, interestingly enough, when I finally got the belt out, it didn't look like it was nowhere close to needing replacement, but I figured I had a new one in hand and I'd let it be another 60K miles before I replaced it again. My symptoms that I thought were telling me that it needed replacing started out as worse and worse chirpping, but soon I developed chirping while the engine was running AND it got worse with the A/C engaged. The weird thing about mine is that it finally sounded like something was broke everytime I would shut off the engine. After getting the belt out, I noticed that the tensioner didn't seem to be responding. Sure enough, I pulled it and couldn't hardly turn the adjusting portion with a 1/2" breaker bar that is about 3 feet long. Needless to say, I bought a tensioner from O'Reillys, got everything back on the engine, and it runs quiet again. If you ever hear a weird rattling sound (not like what the turbo does) when shutting it down (kinda sounds like the engine is shutting down very abruptly), most likely the tensioner is no longer working. At least that was my experience.

dmags

Not too long after I put some miles on my truck, I too would get the belt squeak when shutting down the engine. I was told that this is normal and is a result of the sudden stop of the crankshaft due to the relatively high compression involved with diesels and the spinning inertial mass of the driven accessories. Basically the serpentine belt was "peeling" out against either the crankshaft pulley and/or the accessory pulleys, thus the chirping upon shutdown. One thing to keep in mind is that all tensioners are constantly adjusting the belt tension. Each time the engine is revved in Park or Neutral, each time an automatic transmission shifts, and when you shut down the engine, the tensioner will move. This movement could result in a temporary loosening of the belt just enough to where it slides on a given pulley and chirps. Without watching the actions of the tensioner in slow motion when shutting down the engine, I am only guessing that just before everything stops turning, the tension could suddenly tighten as a result of this movement. I wouldn't worry about it if it were my truck. Good luck!

Later, </span>