229058 / GM30880 Aftermarket Kohler 9/10, 23/27 Heat Exchanger | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket replacement Generator Heat Exchanger - Replaces Part Number: 229058

New copper-nickel replacement heat exchanger for Kohler 229058 and 229058-S. It is used on the 9/10EOZ and 23/27EFOZ marine generator families and cross-references the GM30880 catalogue number.

⚙️ Key Features

• Replaces Kohler 229058 and 229058-S

• Cross-reference GM30880

• Copper-nickel seawater bundle

• Approximately 2.5-inch diameter with a 10-inch bundle

• Designed for listed Kohler EOZ/EFOZ generator sets

🧰 Kit / Assembly Contents

• 1 × Complete heat exchanger assembly - P/N 229058

• 1 × Integrated copper-nickel tube bundle

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

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 229058-S → Service-number form of 229058

OEM / Related Numbers:

• 229058-S

• GM30880

• MRCGM30880

Aftermarket / Verified Equivalents:

• Mr Cool: MRCGM30880

• Seakamp: 229058-S copper-nickel exchanger

• Lenco: LE229058

🚤 Compatibility

Commonly used on:

• Kohler closed-cooled marine generator sets

Typically suits:

• Engine / Equipment models:

• 9EOZ

• 10EOZ

• 23EFOZ

• 27EFOZ

• Output / Engine Rating: Approximately 9kW - 27kW generator output

• Engine / System Type: Closed-cooled marine diesel generator engine

• Year Range: Model/specification-dependent EOZ/EFOZ production

• Serial / Model Identification: Confirm generator model, specification and whether the exchanger is stamped 229058/229058-S.

🔌 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