Name: Zinc OMC Block Anode CMT-984547Z
SKU: XUN180900631
Availability: InStock

Description
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The CMT-984547Z is a zinc block anode designed for OMC Cobra sterndrives, providing sacrificial corrosion protection for the transom, gimbal plate, and surrounding components. It is a direct replacement for OEM part 984547, widely used on OMC systems from the late 1980s.

Made from high-purity zinc alloy, this anode is engineered for saltwater environments, where it corrodes in place of critical drive components to prevent expensive damage.

Key Features

Direct replacement for OMC / BRP 984547
Marine-grade zinc (saltwater optimized)
Block-style anode for transom/gimbal protection
Pressure die-cast to MIL-spec alloy standards
Durable, long-lasting corrosion protection

Application / Compatibility

Designed for:

OMC Cobra sterndrives (approx. 19861989)
Johnson / Evinrude / BRP applications

Installed on:

Transom mount / gimbal plate
Sterndrive mounting assembly

Protects:

Gimbal housing
Transom plate
Adjacent underwater metals

Serial Number Fitment Notice

Always confirm:

OEM reference (984547)
Drive model and year
Mounting hole spacing and dimensions

Typical dimensions (approx.):

Length: ~3.8″
Width: ~4.5″
Height: ~1.24″

When This Part Needs Replacement

Anode is 50% or more consumed
Uneven wear or pitting
Loss of thickness
Routine seasonal inspection

Installation Notes

Install on clean, bare metal surface
Ensure tight, even mounting
Do not paint the anode
Replace mounting hardware if corroded
Inspect regularly in saltwater use

Alternate / Superseded Part Numbers

OMC / BRP: 984547 / 0984547
Camp Company: CMT-984547Z
Martyr: CM984547Z
Cross references: 2422, 00916
Aluminum version: CMT-984547A
Magnesium version available

Parts Desk Insight

This is a critical protection anode on OMC Cobra drives. If its gone, corrosion goes straight into the transom assemblyone of the most expensive repairs on these systems. Always replace it proactively during service.