Re: belt/pulley squeal that i cannot find... DRIVING ME CRAZY!!!
Squeaking on shutdown is an annoyance that is encountered with many diesel engines. At idle rpm and below the torsional inputs are very high and the tensioner arm has to have a lot of leverage on the belt to maintain necessary tension--when it doesn't, the belt briefly slips. Many heavy truck engines have specific logic written into the tuning and will make sure that the fan clutch is engaged to take extra load off the motor.
As I said earlier, the chirping issue is a different issue. This is a belt/pulley groove fit issue-- all belt mfgrs profile their belts differently so in the right environment, some can chirp and some dont simply based on the material and profile differences. A belt swap can stop the noise. However, the noise may come back--there are chronic chirp issues that occur due to misalignment of the pulleys. This causes a deformation of the belt 'v' over time and eventually the belt chirps. This is a drive issue caused by tolerance stack/pulley location, tensioner failure, etc that may or may not be easily corrected.
First thing, first-- isolate the belt/pulley fit issue by spraying water on the belt. If the noise goes away, you have a belt/alignment issue. If noise stays, you have a drive component issue (pulley, bearing, accy, etc).
2000 F250 CCSB-- GT4294R, 250/100s, Dahl/Fuelab, PHP, scan gauge, stock 17* pump
1994 F250 4x4 SC (sold)
1997 F250 CCSB 2wd (sold)