Thermostat 5256423 4929642 3974823 3973834 Compatible With ISDE ISBE ISB QSB B5.9 B3.9 5.9L
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Model Compatibility: Fits ISDE, ISBE, ISB, QSB, B5.9, and B3.9 engine models as listed in the product title. Part Number Match: Replaces specific part numbers 5256423, 4929642, 3974823, and 3973834 for direct specification alignment. Engine Application: Designed for use with 5.9L displacement engines identified within the compatible model range. Functional Purpose: Serves as a replacement thermostat to restore equipment temperature regulation function. Installation Scope: Intended for direct installation on supported engines to match factory operating specifications.
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