Cummins 5.9L ISB/QSB Oil Cooler 3"x 9" 3975986CN 1.3/4'' Replacement Part
$1,028.50 AUD
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Cummins 5.9L ISB/QSB Oil Cooler 3"x 9" 3975986CN 1.3/4'' Replacement Part
$1,028.50 AUD
Shipping calculated at checkout.
Cummins 5.9L ISB/QSB Oil Cooler 3"x 9" Replacement Part (3975986CN) from Mr Cool (USA) is a dedicated heat exchanger & cooler built for Cummins 5.9L ISB/QSB marine engines. Its copper-nickel (CuNi) bundle delivers durable, corrosion-resistant cooling in saltwater environments. The unit measures 3 inches by 9 inches with a 1-3/4 inch connection, making it a straightforward replacement for oils cooling loops in the transmission/oil circuit. Part numbers: 3975986CN.
Big Burjo's Marine ships everywhere across Australia: delivery to every marina, port, coastal town in Australia, from Gold Coast Broadwater to Manly Harbour and Hervey Bay. Free delivery Australia-wide on orders over $350. This heat exchanger & cooler is a strong option in our marine parts range, alongside boat parts and heat exchangers & coolers, offering reliable oil cooling for saltwater use. A trusted replacement part for Cummins 5.9L ISB/QSB engines, it keeps temperatures in check on long passages.
Details
Full specifications, features and technical details for this product are listed in the description above. Need help checking compatibility with your vessel, caravan or 4x4? Contact our Gold Coast team on 0416 180 996 or sales@bigburjos.com and we'll confirm fitment before you order.
Shipping & Returns
Shipping (Australia-wide): Orders over $350 AUD ship free. Orders under $350 have a $15 AUD flat-rate delivery fee. Standard delivery takes 3–11 business days depending on your location; express options (1–3 business days) are available at checkout. Orders are dispatched within 1–2 business days.
Returns: We offer a 30-day return policy. Items must be unused and in original packaging. Contact us at sales@bigburjos.com or 0416 180 996 to start a return. See our full Shipping Policy and Refund Policy for details, including your rights under Australian Consumer Law.
