Cat Stainless Braided Hose Kit - 3406E 40 Pin - Coolant Supply Lines for #5 and #6 Cylinder

Stainless Braided Coolant Hose Kit – Caterpillar 3406E 40-Pin ECM (5EK, 6TS, 1LW, 5DS Serial Prefixes).

This stainless braided hose kit improves coolant distribution on Caterpillar 3406E 40-Pin ECM engines by supplying additional coolant directly to cylinders #5 and #6 from the rear water bonnet. It complements standard flow to cylinder #4, helping maintain more consistent engine temperatures for better performance and longevity.

Kit Includes:

• (1) Coolant Supply Line (Rear Water Bonnet to #5 Cylinder)
• (1) Coolant Supply Line (Rear Water Bonnet to #6 Cylinder)
• (3) Stainless Steel Fittings (1/2" NPT x 1/2" Male JIC, 90 Degree)
• (1) Stainless Steel Fitting (1/2" NPT x 1/2" Male JIC, 45 Degree)

Compatibility:

• Caterpillar 3406E 40-Pin ECM engines – 5EK, 6TS, 1LW, or 5DS serial prefixes
• Peterbilt, Kenworth, Freightliner, and other heavy-duty trucks

Important Notes:

• Not compatible with low-mount exhaust manifolds (insufficient clearance near the turbo hot housing).
• Contact Kustom Truck with your engine serial number and exhaust manifold type to confirm compatibility.

Key Specifications:

• Stainless steel braided hoses for durability and high temperature resistance
• Mirror-polished finish enhances engine bay appearance
• Improves rear cylinder cooling for more consistent temperatures