Description:
PP-3912146 CN Cummins Marine Transmission / Gear Oil Cooler
The PP-3912146 CN Cummins Marine Transmission / Gear Oil Cooler is a heavy-duty copper-nickel shell-and-tube oil cooler designed for Cummins 8.3L marine diesel platforms, including 6CTA and QSC installations.
This cooler removes heat from marine gearbox oil by circulating oil through the internal tube bundle while raw seawater flows through the outer shell. Effective oil cooling is critical for maintaining correct oil viscosity, preventing clutch slippage, and protecting thrust bearings and gear sets during prolonged cruising, manoeuvring, and high-load operation.
The CN (copper-nickel) construction offers superior corrosion resistance compared with standard copper-brass units, making it ideal for salt-water applications and long service intervals. Units are typically supplied with sacrificial pencil zinc anodes to protect internal passages from galvanic corrosion.
Manufactured to OEM dimensional and flow specifications, the 3912146CN is a direct-fit replacement for the original Cummins oil cooler, installing without modification to hoses, mounts, or oil fittings. It is commonly used with ZF, Twin Disc, Borg Warner, and similar marine gearboxes (fitment dependent on installation).
Suits Cummins Marine:
• 6CTA 8.3�L
• QSC 8.3�L
• ISC / ISL marine installations (application-dependent)
• Cummins marine engines fitted with remote transmission (gearbox) oil cooling
Replaces / Cross-Reference:
• Cummins: 3912146N
• Sendure / Lenco copper-nickel equivalents