3851586 Aftermarket Volvo Penta Heat Exchanger | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket replacement Petrol Engine Heat Exchanger - Replaces Part Number: 3851586

New copper-nickel replacement heat exchanger for Volvo Penta 3851586. The approximately 4-inch × 14-inch exchanger is used on GM-based 4.3L V6 and 5.0L/5.7L small-block V8 petrol packages.

⚙️ Key Features

• Direct replacement for Volvo Penta 3851586

• Approximately 4-inch diameter × 14-inch length

• Copper-nickel seawater bundle

• Supports GM V6 and small-block V8 Volvo Penta packages

• Original-style mounting and hose layout

🧰 Kit / Assembly Contents

• 1 × Complete heat exchanger assembly - P/N 3851586

• 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:

• 3851586 (Volvo Penta OEM heat-exchanger reference)

OEM / Related Numbers:

• 3851586CN

Aftermarket / Verified Equivalents:

• Seakamp: 3851586 copper-nickel exchanger

• Lenco: LE3851586

• Mr Cool: MRC3851586CN

🚤 Compatibility

Commonly used on:

• Volvo Penta GM-based petrol sterndrive and inboard engines

Typically suits:

• Engine / Equipment models:

• 4.3L GL model families

• 5.0L GL model families

• 5.7GLP-LKA/LKD/LKE/LKR

• 5.7GSP-LKD/LKE

• 5.7GLi, 5.7Gi and 5.7GSi model families whose parts catalogue specifies 3851586

• Output / Engine Rating: Approximately 190HP - 300HP

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

• Year Range: Model- and serial-dependent 1990s Volvo Penta petrol production

• Serial / Model Identification: Confirm engine model and mounting 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