Fox 5.0 noise

Mike Kauntz · Sep 22, 2018

I'm wondering if anyone else ever had this happen. After "getting on it" I heard a clack clack clack noise coming from the Belt area of the engine. There were a few original worn parts I wanted to change anyway so I changed the serpintine belt, power steering pump, and the pulley on the tensioner. Noise went away until I jumped on it again. After regular city driving the noise faded. I also have an A/C delete with a pulley, the bearing is good and I looked at the harmonic balancer and it looked okay. I might add I ran the engine (shortly) with serpentine belt removed and there was no noise.

General karthief · Sep 22, 2018

Any changes in performance when the 'clacking' occured?
maybe a lifter going slack?

Mike Kauntz · Sep 22, 2018

No change at all. Just the noise.

Mike Kauntz · Sep 22, 2018

General karthief said:
Any changes in performance when the 'clacking' occured?
maybe a lifter going slack?

No change at all.

96pushrod · Sep 22, 2018

I’ve had the bearings in my alternator go bad and it made a clacking sort of noise.

You’re positive it’s coming from your belt area? You open the throttle when standing right next to the engine to verify?

Mike Kauntz · Sep 22, 2018

96pushrod said:
I’ve had the bearings in my alternator go bad and it made a clacking sort of noise.

You’re positive it’s coming from your belt area? You open the throttle when standing right next to the engine to verify?

I'm pretty sure it's coming from the belt area. My brother used to hot test engines at Ford Engine plant and I opened the throttle up for him. He then suggested taking the serpintine off and running the engine and the sound disappeared. I'm not ruling anything out at this point, the alternator was installed just before I bought the car.

Mike Kauntz · Sep 22, 2018

Mike Kauntz said:
I'm pretty sure it's coming from the belt area. My brother used to hot test engines at Ford Engine plant and I opened the throttle up for him. He then suggested taking the serpintine off and running the engine and the sound disappeared. I'm not ruling anything out at this point, the alternator was installed just before I bought the car.

90sickfox · Sep 22, 2018

I've run into similar issues on several cars. Check and make sure the aluminum alternator bracket bolts are tight. I've seen them loosen up and cause a similar noise after getting on them. There's a big bolt kinda hidden in the corner of the bracket under the alternator. I've seen those brackets loosen up and the stress will cause the bracket to break. Check all the mounting bolts for all the accessories ( alt, ac, ps pump, air pump ). Also, check your fan, if its still stock, I've seen the stock plastic blades crack and cause the same issue. Also seen metal flex fan rivets fail causing a tapping noise.

The fan clutch can also cause a noise like that. Pull the fan and inspect it. It shouldn't wobble on the shaft that runs to the water pump.

Mike Kauntz · Sep 22, 2018

90sickfox said:
I've run into similar issues on several cars. Check and make sure the aluminum alternator bracket bolts are tight. I've seen them loosen up and cause a similar noise after getting on them. There's a big bolt kinda hidden in the corner of the bracket under the alternator. I've seen those brackets loosen up and the stress will cause the bracket to break. Check all the mounting bolts for all the accessories ( alt, ac, ps pump, air pump ). Also, check your fan, if its still stock, I've seen the stock plastic blades crack and cause the same issue. Also seen metal flex fan rivets fail causing a tapping noise.

The fan clutch can also cause a noise like that. Pull the fan and inspect it. It shouldn't wobble on the shaft that runs to the water pump.

I hadn't even thought of some of these simpler things to check. I do have the stock plastic fan, I will check these out in the morning. Thank you for the input I'll let you know.

Fox 5.0 noise

Mike Kauntz

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General karthief

wonder how much it would cost to ship you a pair

Mike Kauntz

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Mike Kauntz

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96pushrod

I think they're a little easier to get off

Mike Kauntz

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Mike Kauntz

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90sickfox

Wasn't a pretty sight...and I've got big hands

Mike Kauntz

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Fox 5.0 noise

Member

wonder how much it would cost to ship you a pair

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I think they're a little easier to get off

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Member

Wasn't a pretty sight...and I've got big hands

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