879148T59 / 8M0181739 Aftermarket Mercruiser Zeus 3000 Vertical Transmission/Power Steering Oil Cooler | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket Mercruiser Zeus 3000 Vertical Transmission/Power Steering Oil Cooler - Replacement Part Number: 879148T59 / 8M0181739

Vertical tandem transmission and power-steering cooler for Zeus 3000 packages.

⚙️ Key Features

• Marine-grade tandem shell-and-tube cooler

• Designed as a direct replacement for the listed reference numbers

• Helps maintain stable operating temperature under sustained marine load

• Marine connection sizes and mounting points must match the original assembly

• Suitable for professional marine cooling-system service and replacement

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 8M0181739 → Supersedes 879148T59

OEM / Related Numbers:

• 879148T59

• 8M0181739

Aftermarket / Verified Equivalents:

• Mr Cool: MRC879148T59

• Seakamp: Zeus vertical tandem replacement

🚤 Compatibility

Commonly used on:

• Marine-grade tandem shell-and-tube cooler systems

Typically suits:

• Engine models:

• Zeus 355, 380, 425 and 480

• Installations paired with horizontal drop-box cooler 897345T95

• Orientation: vertical

• Circuits: transmission oil and power-steering oil

• System: Zeus 3000 pod drive

🔌 Function

The tandem cooler uses separate oil passages and a common seawater circuit to control two fluid systems.

Common signs of failure:

• One or both fluid circuits run hotter than normal

• Pressure or performance falls as the oil heats

• Oil sheen or cross-contamination appears

• External leakage develops around fittings or seams

• Restricted seawater flow or internal tube failure

📦 Condition

• Brand new aftermarket replacement part

• New and unused

• Supplied in manufacturer or equivalent protective packaging