I have a 95 F150 with a 5.0. I have a strange chirping noise in the motor. I thought it was just the belt slipping. I replaced the belt, belt tensioner and then the water pump. The noise continued. Then I removed the belt and ran the motor. The noise was still there. This eliminated all the accessories. It sounds just like a belt chirp. It sounds like it's external, no knocking or heavy metal sound. Has anyone heard of a harmonic balancer making a noise like this? Any help would be appreciated.

 

Have a good look at the balencer , if the rubber is old & cracked or missing pecies it could be , make sure the bolts tight , if you think it sliped put a timing light on it & see ....Lew

 

The rubber looks good and it doesn't appear to have slipped, the factory puts a white paint mark across the two pieces and they're still line up. I would think if it slipped I would also be getting a bad vibration. I was thinking it wore out and it's metal rubbing causing the noise. I see a slight wobble when it's running, but very slight. I already spent a bunch of money on belts, tensioners and water pump and was hoping someone has also experienced this, before I throw more money at it. The truck runs great with only 150,000 miles. I just don't want to be left stranded.

 

I am in the same situation-and have just noticed that the Thermactor/air pump pulley has developed a wobble--and suspect that it is the source of this chirping noise.

But if you removed the drive belt-your problem couldnt be this-never mind. Does the noise go away when the clutch pedal is depressed ?-(if your truck is a manual)

 

It turned out to be the distributor. The bushing went bad. When I pulled it out and turned the shaft it was obvious. I just put a new one in and the noise is gone.

 

New distributor or new bushing?? How many miles on the distributor?

 

ok subscribing to this cause mine is doing it and it goes up and down with rpms i'll check that bushing tomorrow

 

I had to replace the whole distributor. It was original 150,000 miles. When I took it out and turned the shaft by hand it made the noise. I narrowed it down by taking the belt off and running the motor, it still made the noise. Then I put a long screw driver handle to my ear and the other end down to the base of the distrubutor. I could hear the chirping through the screw driver. This is similar to using a tethoscope.

 

I had to replace the whole distributor. It was original 150,000 miles. When I took it out and turned the shaft by hand it made the noise. I narrowed it down by taking the belt off and running the motor, it still made the noise. Then I put a long screw driver, handle to my ear and the other end down to the base of the distrubutor. I could hear the chirping through the screw driver. This is similar to using a stethoscope.

 

It is a bad cps synchronizer.Go to youtube and type in"bad cps synchronizer"and you can see a video of one chirping out of the motor.Apparently common on the 5.0.
EDIT-or bad distributor(labmaster)