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PP-3975986CN

Cummins 3975986CN Transmission Cooler 3x5 CuNi for 5.9L/ISB/QSB

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$1,495.45 (excluding GST)
Or, 4 easy payments of $429.94 (including GST) with Buy PP-3975986CN with Afterpay.
Details:
Product Group: Cooling Systems
Product Sub Group: Coolers / Heat Exchangers
Product Sub Group 2: Transmission Coolers
Product brand: Seakamp
Product fitment brand: Cummins

Description:

PP-3975986CN Cummins Transmission Cooler


This Seakamp Transmission Cooler is a marine-grade replacement designed for Cummins marine diesel engines used in commercial fishing vessels, workboats, sport-fishers and pleasure craft, most commonly fitted to the 5.9L, ISB, QSB family. The unit has a 3"x5" core.


The transmission cooler circulates gearbox oil through a tube-and-shell core where raw water absorbs heat, keeping marine gear oil within its specified operating range. Stable gear-oil temperature is critical for clutch-pack longevity, bearing protection and consistent shift engagement under continuous load.


Marine gear oil that overheats loses its load-carrying additives, leading to clutch slippage, premature bearing wear and seal failure. A correctly functioning transmission cooler preserves shift quality, protects the gearbox internals, and is especially important on high-torque diesel installations and prolonged trolling duty.


Manufactured to match OEM dimensions, port orientation and mounting geometry, the 3975986CN is a true direct-fit replacement for the original Cummins component. It installs without modification to existing hoses, brackets or pipework, making it suitable for planned maintenance, corrosion replacement or preventative servicing. The copper-nickel (CuNi) tube bundle gives superior resistance to seawater corrosion and electrolytic attack compared to standard copper, extending service life in tropical or high-chloride water.


Suits Cummins:

• Cummins 5.9L

• Cummins ISB

• Cummins QSB

• Other Cummins transmission cooler applications using this Seakamp form factor


Replaces / Interchangeable With:

• Cummins: 3975986CN

• 3975986 (copper variant of same part)

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