F450 Engine(?) Screech

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Sep 21, 2014 | 09:56 PM

duckwing

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F450 Engine(?) Screech

My F450 2010 class C motor home has the V10 engine. In the RPM range of about 2200 - 2300, there is a screeching sound I believe is from the engine area. It does not matter what transmission gear I'm in thus the vehicle speed is not a factor - only happens in that engine RPM range. Seems to happen when slowly accelerating/decelerating through the 2200 - 2300 RPM range or continues to screech if I maintain that RPM. If I drop back or increase RPM out of the range it quits. If I accelerate thru the range a little quicker it doesn't happen. Also does not happen when parked and the engine is sped up. Any thoughts?

Jim

Sep 22, 2014 | 06:15 AM

redford

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From: Stephensville WI

Welcome to FTE duckwing.

My guess would be the idler or the tension pulley on the serpentine belt is worn. I replaced mine at 85,000 miles.

Sep 22, 2014 | 06:35 AM

Tom

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From: Isanti, MN

Does it change when you turn the air conditioner on or off?

My first thought was in the serpentine belt system, but that doesn't care if the truck is in gear or not.

Sep 22, 2014 | 08:16 AM

duckwing

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I did not try AC ON/OFF but will.

Vehicle has less than 30,000 miles on it.

Thanks - Jim

Sep 22, 2014 | 01:29 PM

phillips91

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From: Rogersville, TN

Quote:

Originally Posted by Tom

Does it change when you turn the air conditioner on or off?

My first thought was in the serpentine belt system, but that doesn't care if the truck is in gear or not.

My bronco blew the ac clutch out a while back and it would make a screeching sound when engaged, but it did it at all rpms.