F 250 2WD Pickup V8-7.3L DSL (1990)
This TSB article is being republished in its entirety to provide specific bolt number references in Figures 3 and 4.
ISSUE:
Front-end accessory drive belt (FEAD) belt noise may be heard and excessive belt edge wear or loss may occur.
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The "chirp" noise may occur at constant engine speeds and all engine loads. It is caused by belt/pulley misalignment.
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The belt "squeal" noise is intermittent and is heard during engine speed variations, usually at engine start up. The noise is caused by belt slippage.
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Belt edge wear and/or belt loss is caused by belt mistracking across the automatic belt tensioner. If the automatic belt tensioner is out of parallel, the
belt can be "driven" to either flange of the pulley, causing belt edge wear and in some cases, the loss of the belt.
