Marine Parts Express will be closing for inventory from January 7th through January 17th, 2022. On-line ordering will still be available and orders will be processed. However, phone support will be limited during this time.
IMPORTANT: MARINE PARTS EXPRESS INTENDS TO REMAIN OPEN DURING THE COVID-19 CRISIS, HOWEVER WE NEED YOU TO BE AWARE THAT FEDEX, UPS, AND USPS ARE EXPERIENCING NATIONWIDE SHIPPING DELAYS. AS A RESULT, WE MAY NOT BE ABLE TO GUARANTEE 2ND DAY OR OVERNIGHT SHIPMENTS. IF YOU ARE WORKING WITHIN A LIMITED SHIPPING WINDOW, IT IS IMPERATIVE THAT YOU CONTACT US DIRECTLY - VIA PHONE (NOT EMAIL) - TO CONFIRM AVAILABILITY AND/OR ALTERNATE SHIPPING METHODS INCLUDING DROPSHIPPING. THANK YOU FOR YOUR PATIENCE. 1-877-621-2628.
If you are on a mobile device or having trouble viewing schematics below, try downloading the schematics manually by clicking on the download button 
These schematics are for specific serial number engine models. While many Cummins engines share the same part numbers not all engines within a family use exactly the same parts, please contact with the engine serial number to verify.
4BT3.9M.UNIT(150) 4B3.9/ - May 30 2019 07:00:22 PM