Fresh Water Cooling Systems for Marine Engines

Engines are complex systems with constantly moving parts that must be monitored and maintained for peak performance. That’s why fresh water cooling systems and monitor cooler kits are essential for any serious boat owner. These systems help maintain optimal engine temperatures, preventing overheating and protecting your investment on the water. At Marine Engines, Inc., we are dedicated to helping you keep your engines running safely and efficiently.

Our fresh water cooling systems and kits are among the best available on the market. Each kit includes all the necessary components to ensure a complete installation, and we back every product with a full two-year warranty. This means you can purchase with confidence, knowing your engine cooling system is protected.

We offer a variety of cooling system options to meet different engine configurations and performance needs:

  • Full System – Cools engine block, heads, intake manifold, and exhaust manifolds
  • Half System – Cools engine block, heads, and intake manifold
  • MFH – Front-mounted heat exchanger
  • MFV – Front-mounted vertical
  • MRM – Remote mounted

All systems are designed to provide reliable performance, durability, and ease of installation. With our deeply discounted delivery prices, we make it convenient and affordable to get the parts you need, whether for routine maintenance or full system upgrades.

Our trained staff is always available to answer questions, provide guidance, and support you throughout the installation process. We strive to offer professional, responsive service tailored to your needs, so you can focus on enjoying your boat.

Upgrade your engine’s cooling system today and ensure worry-free performance. Visit our Holliston warehouse or place your order online to get started.

Fresh Water Cooling Kits

Full System – Cools engine block, heads, intake manifold
and exhaust manifolds

Half System – Cools engine block, heads, and intake manifold

MFH-Front mounted heat exchanger

MFV-Front mounted vertical

MRM-Remote Mounted

Full two year warranty on heat exchanger and kit components.

Kit #

Engine Model

Engine Type

System

2025 Promotional Pricing!!

MFV-5241

Volvo Penta /OMC
V6-V8
262-305-350 – GM Based

MFV-5241 Specifications

MFV-5241 Installation Instructions

Stern Drive and Inboard

Half

$1796.25

MRM-5439 Off-engine Volvo Penta V8
302-351 – Ford BasedMRM-5439 Specifications

MRM-5439 Installation Instructions

Stern Drive and Inboard

Half

$1796.25

MFH-5057

OMC 5 liter Ford V8
302-351

MFH-5057 Specifications

MFH-5057 Installation Instructions

Stern Drive Only

Half

$1571.25

MFH-5398

Standard Mercruiser
V6/V8
262-305-350

MFH-5398 Specifications

MFH-5398 Installation Instructions

Stern Drive and Inboard

Half

$1421.25

MFH-5229

Premium Mercruiser & Marine Power V6-V8
262-205-350
MFH-5229 Specifications

MFH-5229 Installation Instructions

Stern Drive and Inboard

Half

$1496.25

MFH-5433

Standard Mercruiser
V6/V8
262-305-350
MFH-5443 Specifications

MFH-5443 Installation Instructions

Stern Drive and Inboard

Half

$1721.25

MFH-5406

Hi-Performance Chevy
Small Block V8
MFH-5406 Specifications

MFH-5406 Installation Instructions

Stern Drive and Inboard

Half

$1496.25

MFH-5399

Standard Mercruiser
V6/V8
262-305-350

MFH-5399 Specifications

MFH-5399 Installation Instructions

Stern Drive and Inboard

Full

$1571.25

MFH-5230 Premium Mercruiser V6/V8
262-305-350
V-Belt – High Performance
Conventional Exhaust
MFH-5230 Specifications

MFH-5230 Installation Instructions

Stern Drive and Inboard

Full

$1721.25

MFH-5320-A

Premium Mercruiser V6/V8
262-305-350
Serp Belt
Conventional Exhaust
V6 Serial # below OM 615,000
V8 Serial # below OM 600,000

MFH-5320-A Specifications

Stern Drive and Inboard

Full

$1871.25

MFH-5320-B

Premium Mercruiser V6-V8
262-305-350
Serp Belt
Dri-Joint Exhaust
V6 Serial # above OM 615,000
V8 Serial # above OM 600,000

MFH-5320-B Specifications

Stern Drive and Inboard

Full

$1998.75

MFH-4949 MerCruiser V8
454-502
Carb. Only
V-Belt
MFH-4949 Specifications

MFH-4949 Installation Instructions

Stern Drive, Inboard,
& V-Drive

Half

$1931.25

MFH-5403 Hi-Performance Chevy
Big Block V8
MFH-5403 Specifications

MFH-5403 Installation Instructions

Stern Drive and Inboard

Half

$2238.75

MFH-5374 Premium Mercruiser V8
454-502
MFH-5374 Specifications

MFH-5374 Installation Instructions

Stern Drive, Inboard,
& V-Drive

Full

$2238.75

MFH-5321 Hi-Performance 500-700 HP Off Engine KitMRM-5321-5322 Specifications

MRM-5321-5322 Installation Instructions

Stern Drive, Inboard,
& V-Drive

Half

$2546.25

MFH-5322 Hi-Performance 700-900 HP Off Engine KitMRM-5321-5322 Specifications

MRM-5321-5322 Installation Instructions

Stern Drive, Inboard,
& V-Drive

Half

$2546.25

MFH-5344

Mercruiser 4 Cylinder
3 Liter
Serial # 0L010042 to
0M680000

MFH-5344 Specifications

MFH-5344 Installation Instructions

Stern Drive and Inboard

Half

CALL

MRM-5345

Chevy 4 Cylinder 3 Liter
Off Engine Kit

MRM-5345 Specifications

MRM-5345 Installation Instructions

Stern Drive and Inboard

Half

CALL