3861471 Aftermarket Volvo Penta Small Block Heat Exchanger | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket replacement Petrol Engine Heat Exchanger - Replaces Part Number: 3861471

New copper-nickel replacement heat exchanger for Volvo Penta 3861471. It is a front-mounted approximately 4.125-inch × 13.75-inch exchanger for later GM V6 and small-block V8 petrol engines.

⚙️ Key Features

• Direct replacement for Volvo Penta 3861471

• Approximately 4.125-inch diameter × 13.75-inch length

• Front-mount small-block/V6 configuration

• Copper-nickel raw-water bundle

• Original-style hose and bracket layout

🧰 Kit / Assembly Contents

• 1 × Complete heat exchanger assembly - P/N 3861471

• 1 × integrated copper-nickel tube bundle

• End-cap seals, zincs, hoses and mounting hardware are renewed separately unless included

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 3861471 (Volvo Penta OEM heat-exchanger reference)

OEM / Related Numbers:

• 3861471CN

Aftermarket / Verified Equivalents:

• Mr Cool: MRC3861471CN

• Lenco: LE3861471

• Seakamp copper-nickel small-block replacement

🚤 Compatibility

Commonly used on:

• Volvo Penta GM-based petrol marine engines

Typically suits:

• Engine / Equipment models:

• 5.7Gi-300-J, 5.7Gi-300-JF and 5.7Gi-300-N

• 5.7OSi-300-JF

• 5.7GXi-J, 5.7GXi-JF and 5.7GXi-N

• 5.7OSXi-JF

• Specified 4.3L and 5.0L applications using the same front-mount exchanger

• Output / Engine Rating: Approximately 220HP - 320HP

• Engine / System Type: Fuel-injected GM V6 or small-block V8 petrol marine engine

• Year Range: Later Volvo Penta petrol production; serial-dependent

• Serial / Model Identification: Confirm engine model and front-mount configuration.

🔌 Function

The heat exchanger transfers engine or generator coolant heat into the raw-water circuit while keeping the two fluids separated. This maintains the correct closed-circuit operating temperature and protects the engine from direct seawater circulation.

Common signs of failure:

• Engine or generator overheating under sustained load

• Coolant loss without an obvious external hose leak

• Saltwater and coolant cross-contamination

• Restricted raw-water discharge or uneven end-cap temperature

• Corrosion, green staining, cracked solder joints or pressure-test failure

📦 Condition

• New aftermarket replacement part

• Brand new

• Supplied in original or equivalent packaging