Belt Pulley

Alternator Pulley 3926858 for Cummins ISB6.7 ISC8.3 QSB6.7 – Direct-fit Replacement

<p>Stop wasting time and money on alternator pulleys that fail mid-shift or throw belts under load — this <strong>direct-fit Cummins alternator pulley</strong> delivers OEM-equivalent durability and precise tension retention for ISB6.7, ISC8.3, and QSB6.7 engines. Built to match the exact 24-tooth helix angle and 10.5mm pitch diameter of the original, it eliminates harmonic slip and prevents premature belt wear — a common failure point with generic aftermarket units.</p> <ul> <li><strong>Verified cross-reference</strong>: Fits 3926858, 3965146, and 3965147 applications — no guesswork needed</li> <li>Engineered for Cummins CM2250/CM2350 series platforms with factory-matched bore tolerance (Ø32.00 ±0.01 mm)</li> <li>Ready to ship today from our Guangzhou warehouse — no 4-week waits or inflated OEM pricing</li> <li>Backed by 6-month warranty and real-time technical support from Cummins-certified parts specialists</li> </ul>