Peterbilt 379. Fan clutch was replaced 3 years ago. ITs always had this loud annoying screech when it engages. Would like to finally figure it out. Few notes: ITs not the fan belt or the tensioner. I replaced all that thinking it was the issue. The noise is indeed coming from the clutch when it engages.
Peterbilt 379 Fan clutch Squeak when engaging.
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Don379, Apr 29, 2021.
Page 1 of 5
-
-
Trucking Jobs in 30 seconds
Every month 400 people find a job with the help of TruckersReport.
-
Sorry Don,
Revisit your belts. Tis not the clutch.
Are you sure you dont have any worn pulleys? Are we talking v or serp? If v and manual adjust, how did you set the tension?Dino soar, Rideandrepair, dunchues and 2 others Thank this. -
You might could try a new solenoid that supplies the air to it. It may not be putting air to the clutch fast enough. Might not make a difference but it is where I would start. Basically you have a clutch engaging and it is making that noise because it is probably grabbing it when the fan is stationary and the hub is spinning at who knows how many RPMS. I would squeal too. : )
Dino soar, Rideandrepair and God prefers Diesels Thank this. -
Rideandrepair, Goodysnap and God prefers Diesels Thank this.
-
Rideandrepair and God prefers Diesels Thank this.
-
Long shot, but have you looked at your crank pulley grooves? They get rubber in them, and cause your belt to ride high. Then it squeals like a pig. I pulled my belt off and ran the engine while I held a flathead screwdriver in each groove. #### going everywhere. Finished with a wire brush. No more squeak.
Learned the trick right here on TTR.Itsbrokeagain, Dino soar, S.V.Buyck and 5 others Thank this. -
I also suggest checking the pulley grooves on the hub and crank pulley. Belt should ride on the sides of the grooves, not the points. If the grooves have worn down, the belt will sit low and won't grip the pulley properly.
Dino soar, Rideandrepair, Don379 and 1 other person Thank this. -
Clean the grooves and look for wear on them. You aren't supposed to use belt conditioner on serpentine belts but if you did that would let you know if the belt is the culprit for sure.
Rideandrepair, Don379 and lester Thank this. -
I will be pulling belt off and cleaning pullies this weekendDino soar, Rideandrepair, Isafarmboy and 2 others Thank this. -
Rideandrepair and God prefers Diesels Thank this.
Trucking Jobs in 30 seconds
Every month 400 people find a job with the help of TruckersReport.
Page 1 of 5