Cummins ISX 3689611 Timing Gear PAI 172025OEMCROSS REFERENCE: 3689611 3690446 3689135 3686776 3685512 APPLICATION: Cummins ISX Multiple Use Application. DETAILS: Genuine Part BRAND: PAI 172025OEM Cummins ISX 3689611 Timing Gear PAI 172025OEM. Replacement parts and aftermarket parts. Supports gear rotation and maintains consistent engine timing. All components are proudly manufactured in the U. S. A. by PAI Industries Inc., an ISO9001 certified company with over 50 years of experience in the