I recently hauled a 5000lb trailer with my 03 F250 6.0L Super Duty Turbo diesel and noticed a strange noise, similar to a belt hitting something, when the turbo kicked in while pulling up a hill. This noise seems to come from the center part of the engine near the cab. Once I took my foot off of the accelerator it stopped. It only seems to happend when under load. Nothing obvious is loose around the turbo. Any ideas?

 

the only time i've heard a belt hit something it was my dad's across my behind........what kind of noise are you hearing?.

 

I'm guessing your hearing the fan kick on. Just my .02

 

It took me awhile to figure out the sound the electric fan makes when it kicks in and out, but it aways kicks in under a load/up hill it seems, but it sounds like a dull whine like a turbo

 

The noise is more like a flapping sound (not a knock) that happens about every 0.5 seconds for as long as you put it under load. It is definitly not a whining noise.

 

I would say an exhaust leak at one of the up pipes,grab a flash light and have a look for soot on the up pipes from above and below.

 

Have you unplugged your EGR yet? Mine did the same thing, after unplugging the EGR, I've never heard the sound again.

 

So what is an EGR? Also, reference exhaust leaks.. I recently had the Y tube replaced just under the turbo because of a small fracture that was causing diesel fumes to leak into the cab. This noise seemed to appear after that was fixed.

 

Huntlin, read this thread for more info:

https://www.ford-trucks.com/forums/2...tructions.html