805136T Aftermarket Mercruiser 7.4L Big Block Front-Mount Heat Exchanger | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket Mercruiser 7.4L Big Block Front-Mount Heat Exchanger - Replacement Part Number: 805136T

Front-mounted heat exchanger for selected MerCruiser 7.4L big-block engines.

⚙️ Key Features

• Marine-grade shell-and-tube heat exchanger

• 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:

• 805136T (primary reference)

OEM / Related Numbers:

• 805136T

Aftermarket / Verified Equivalents:

• Seakamp: 805136T-CN

• Lenco: LE-805136

• Mr Cool: MRC805136T

🚤 Compatibility

Commonly used on:

• Marine-grade shell-and-tube heat exchanger systems

Typically suits:

• Engine models:

• MerCruiser 7.4L / 454 CID big-block closed-cooled engines

• Centre-discharge exhaust configurations

• Engine Displacement: 454 CID / 7.4L

• Body Diameter: approximately 4 in

• Overall Length: approximately 25 in

• Mounting Position: front mount

🔌 Function

The heat exchanger keeps closed-loop coolant separate from seawater while transferring heat through the tube stack.

Common signs of failure:

• Engine or generator temperature rises above normal under load

• Coolant loss or seawater leakage around the exchanger

• Restricted seawater flow from scale, debris or damaged tubes

• Coolant contamination caused by an internal tube failure

• Corroded end covers, tube stack or sacrificial anode

📦 Condition

• Brand new aftermarket replacement part

• New and unused

• Supplied in manufacturer or equivalent protective packaging