3915159CN Aftermarket Cummins 4BT/6BT ZF Oil Cooler | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket replacement Gear/Power-Steering Oil Cooler - Replaces Part Number: 3915159CN

New copper-nickel oil cooler replacing Cummins 3915159. The approximately 2-inch × 12-inch bundle is used on selected 4BT/6BT marine packages with ZF gearbox or SeaStar hydraulic circuits.

⚙️ Key Features

• Direct replacement for Cummins 3915159

• Approximately 2-inch diameter × 12-inch bundle

• Approximately 15-16-inch overall length

• Approximately 1.25-inch seawater and 1/2-inch NPT oil connections

• Grounding, zinc and drain provisions

🧰 Kit / Assembly Contents

• 1 × Complete oil cooler - P/N 3915159CN

• 1 × integrated copper-nickel tube bundle

• 1 × grounding connection

• Sacrificial-zinc and drain fittings according to manufacturer configuration

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 3915159CN → Copper-nickel replacement for Cummins 3915159

• Sendure 10261-1-7 (related replacement)

OEM / Related Numbers:

• 10261-1-7

Aftermarket / Verified Equivalents:

• Sendure: 10261-1-7

• Mr Cool: MRC3915159CN

• Lenco: LE3915159

🚤 Compatibility

Commonly used on:

• Cummins B-series marine propulsion packages

Typically suits:

• Engine / Equipment models:

• 4BT 150HP installations

• 6BT 210HP and 220HP Diamond installations

• ZF marine gearbox and SeaStar power-steering circuits specifying 3915159

• Output / Engine Rating: Approximately 150HP - 220HP on documented applications

• Engine / System Type: Four- or six-cylinder Cummins marine diesel with gear/steering hydraulic circuit

• Year Range: Engine- and installation-dependent

• Serial / Model Identification: Confirm whether the cooler serves gearbox oil or steering fluid and match all ports.

🔌 Function

The cooler transfers heat from transmission or reduction-gear oil into the raw-water circuit. Correct oil temperature protects clutches, bearings, seals and hydraulic control components.

Common signs of failure:

• High transmission or reduction-gear oil temperature

• Burnt, darkened or aerated gear oil

• Delayed engagement, slipping or abnormal gear noise when hot

• Water-contaminated or milky transmission oil

• External oil leakage, corrosion or failed pressure test

📦 Condition

• New aftermarket replacement part

• Brand new

• Supplied in original or equivalent packaging