91036A8 Aftermarket Mercruiser Heat Exchanger | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket Mercruiser Heat Exchanger - Replacement Part Number: 91036A8

Full-system front-mounted heat exchanger for MerCruiser small-block V8 sterndrive 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:

• 91036A8 → Later assembly in the 91036/A1/A5/A8 family

OEM / Related Numbers:

• 91036

• 91036A1

• 91036A5

• 91036A8

Aftermarket / Verified Equivalents:

• Seakamp: 91036A8 replacement

• Lenco: LE-91036

• Mr Cool: MRC91036A8

🚤 Compatibility

Commonly used on:

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

Typically suits:

• Engine models:

• MerCruiser GM 305 CID / 5.0L V8 sterndrive

• MerCruiser GM 350 CID / 5.7L V8 sterndrive

• Cooling Type: full-system block and manifold cooling

• Mounting Position: front mount over circulation pump

🔌 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