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Replace the o-ring and gasket at install and confirm 90–120 psi clean air supply at the valve
Sachs: 311634
Manufacturer OEM Part Number Cummins 3917440
Verify your engine serial number and confirm dual-connector layout before ordering — Cummins uses several speed-sensor variants across the B/ISB/QSB family with different connector configurations
Euclid: E-FS7086
PAI 680371 Accessory Drive Assembly 8-Groove Steel Pulley – Detroit Series 60 series_60 Replace the o-ring and gasketPremium aftermarket replacement accessory drive assembly from PAI Industries. The 680371 is a complete assembly with an 8 groove Poly V steel pulley and a 34 tooth right hand helix gear, built in the USA and supplied all new with no core required. It replaces Detroit Diesel 23523998 on Series 60 engines and includes the 621219 seal ring. Signs You Need a New Accessory Drive Belt squeal or chirp that returns after a new belt is fitted Visible pulley