FITMENT
- 2009–2019 6.7L Ram Cummins 2500 / 3500 Turbo Diesel (Pickup).
- 2009–2019 6.7L Ram Cummins 3500 / 4500 / 5500 Turbo Diesel (Cab & Chassis).
DESCRIPTION
Product Overview
- Heavy towing and high-boost operation subject the 6.7L Cummins to severe thermal stress, particularly at the rear of the engine block. Due to flow limitations within the factory cooling jacket, coolant tends to stagnate around cylinders #5 and #6—creating localized heat hotspots, uneven head expansion, and a significantly higher risk of blown head gaskets during sustained pulls.
- Engineered to equalize block temperatures, this Rear Coolant Bypass Hose Kit provides a dedicated pressure-relief pathway at the rear of the cylinder head. By establishing continuous, balanced coolant flow across cylinders #5 and #6, it eliminates dangerous thermal pockets, reduces cooling system pressure spikes, and protects your motor under demanding heavy-duty workloads.
Key Features
- Swaps factory plastic coolant fittings for aerospace-grade billet aluminum that handles extreme heat cycles without degrading
- Establishes a targeted bypass flow path that drives more coolant to the rear cylinders (#5 & #6) during heavy towing
- Eliminates a common leak point with corrosion-resistant metal construction and stainless steel hose clamps
- Lowers localized cylinder head temperatures by improving circulation balance across all six cylinders
- Installs as a direct-fit upgrade with no permanent modifications to the factory cooling circuit
FAQ
Q: Why do I need a coolant bypass on a 6.7L Cummins?
A: The factory system works fine for daily driving, but under heavy towing the rear of the engine runs noticeably hotter because coolant flow tapers off between cylinders #5 and #6. This kit routes additional flow to that area, bringing temperatures back into balance and easing thermal stress across the entire head.
Q: Is this kit meant to fix an existing coolant leak, or is it preventative?
A: Both. If your factory plastic coolant barb fitting is already seeping or cracked, this kit replaces it with a metal upgrade that stops the leak permanently. Even if yours isn’t leaking yet, the billet adapter is a proactive upgrade that eliminates the weak point before it leaves you stranded.
Q: Can I install this alongside an EGR delete on my truck?
A: Yes — in fact, many owners install this as a complementary cooling upgrade after removing the EGR cooler, since the factory EGR system routes coolant differently. The two mods work well together.
Q: Does this kit work with the Seguler EGR delete lineup?
A: It pairs perfectly with the Seguler EGR Cooler Valve Delete Kit for a complete cooling and intake system overhaul.
