879150A80 / 8M0181781 Aftermarket Mercruiser Zeus 3000 Horizontal Transmission Oil Cooler | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket Mercruiser Zeus 3000 Horizontal Transmission Oil Cooler - Replacement Part Number: 879150A80 / 8M0181781

Horizontal Zeus 3000 drop-box cooler for 550 and 600 packages.

⚙️ Key Features

• Marine-grade shell-and-tube oil 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:

• 8M0181781 → Supersedes 8M0036211

• 8M0036211 → Supersedes 879150A80

OEM / Related Numbers:

• 879150A80

• 8M0036211

• 8M0181781

Aftermarket / Verified Equivalents:

• Mr Cool: MRC879150A80

• Seakamp: Zeus horizontal replacement

🚤 Compatibility

Commonly used on:

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

Typically suits:

• Engine models:

• Zeus 550 and 600

• Installations paired with vertical cooler 879150A79 / 8M0181550

• Orientation: horizontal

• Overall Length: approximately 8-1/2 in

• Maximum Width: approximately 3-1/8 in

🔌 Function

The cooler transfers heat from oil into the raw-water circuit without allowing the fluids to mix.

Common signs of failure:

• Oil or steering-fluid temperature rises above normal

• Loss of pressure or reduced transmission/steering performance as oil heats

• Oil sheen at the exhaust outlet or cross-contamination

• External leakage from fittings, seams or tube ends

• Restricted seawater flow, corrosion or internal tube failure

📦 Condition

• Brand new aftermarket replacement part

• New and unused

• Supplied in manufacturer or equivalent protective packaging