99356A1 Aftermarket Mercruiser Power Steering Cooler | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket Mercruiser Power Steering Cooler - Replacement Part Number: 99356A1

Compact early MerCruiser 3.0L power-steering cooler.

⚙️ 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:

• 99356A1 (early 1-inch water version)

OEM / Related Numbers:

• 99356A1

• 99356A2 later 1-1/4-inch version

Aftermarket / Verified Equivalents:

• Mr Cool: MRC99356A1

• Seakamp: 99356A1 replacement

• Lenco: 99356A1 replacement

🚤 Compatibility

Commonly used on:

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

Typically suits:

• Engine models:

• MerCruiser 3.0L inline-four through serial 0L340999

• Body Length: approximately 5 in

• Overall Length: approximately 7-7/8 in

• Body Diameter: approximately 2-1/8 in

• Water Connections: 1 in

• Oil Connections: push-on hose barbs

🔌 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