Pulley alignment

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Oct 25, 2024 | 04:38 PM

ehusmann

Thread Starter

Cross-Country

Joined: Oct 2014

Posts: 78

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Pulley alignment

1993 F150 5.0L. Recently truck has developed a serpentine belt alignment issue where the air pump pulley is slightly turned in toward the center of the engine. Anyone ever have this problem? Some recent history. Roughly two months ago air pump decided to cause problems. First fix was to pull air pump pulley and install a smaller belt. Didn't work. Tried several belts but none provided correctly tension but lots of squealing noise. Second attempt was to install a delete kit from LMR. Looked good but more issues. First belt came off. Second belt - more noise. Third attempt, gut the air pump and re-install. Still some belt chatter and it shed one rib of the belt. My only explanation is somehow the alternator/air pump mount has become twisted. Any thoughts as to why this is happening?

Oct 25, 2024 | 09:44 PM

Junktownbill99

Fleet Mechanic

Joined: Nov 2022

Posts: 1,695

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I doubt the mounting bracket is bent. Pull the belt off and check every pulley and bearing.

Also inspect the harmonic balancer, make sure the rubber ring is intact.

Oct 25, 2024 | 09:49 PM

AuroraGirl

Lead Driver

Joined: Jun 2021

Posts: 5,208

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Quote:

Originally Posted by ehusmann

most likely another pulley is the problem, check the Power steering pump pulley if its flush with the shaft, and without a belt see if the pulley is able to go in/out a tiny bit (its supposed to)