Description

Volvo Penta 21403633 is a genuine OEM aluminum anode used as an exhaust manifold anode on selected Volvo Penta gasoline marine engines. Volvo Penta’s official parts shop identifies part number 21403633 simply as Anode, and multiple current marine-parts dealers describe it more specifically as an exhaust manifold anode for gasoline applications.

This anode is designed to help protect internal cooling passages and related manifold areas from galvanic corrosion in salt and brackish water service. Current dealer listings consistently describe it as an aluminum anode and note that the mounting screw is not included. Volvo Penta also emphasizes that its genuine anodes are designed and tested for correct fit and corrosion protection.

Key Features

• Genuine Volvo Penta OEM anode
• Part number: 21403633
• Common application: exhaust manifold anode
• Material: aluminum
• Intended for salt and brackish water use
• Mounting screw not included
• Current dealer listings show approximate weight around 0.094 kg.

Engine Compatibility
Current compatibility listings connect Volvo Penta 21403633 to selected gasoline engines including:

• 5.0 GiC
• 5.7 GiC
• 5.0 GXiC
• 5.7 GXiC
• V6 200
• V6 240
• V6 280
• V8 225
• V8 270
• V8 300
• V8 350

Serial Number Fitment Notice
Fitment should always be confirmed by engine serial number before ordering. Volvo Penta’s official shop specifically advises identifying the exact engine, shield, or drive when locating replacement parts.

When This Part Needs Replacement
Replace this anode when:

• the anode has been significantly consumed
• corrosion protection is reduced due to wear
• the manifold is being serviced and the existing anode is near the end of its life
• saltwater or brackish-water use has accelerated deterioration
• the original anode is damaged or seized in place

Installation Notes

• Confirm fitment by serial number first.
• This is an aluminum manifold anode intended for salt and brackish water applications.
• Inspect the manifold port threads and sealing area before installation.
• Replace badly consumed anodes before they are fully depleted.
• Verify whether you need only the anode or a more complete kit, since some sellers also offer kit versions with seals and hardware.

Alternate/Superseded Part Numbers
Current reviewed sources consistently identify this part as 21403633. I did not confirm a reliable superseded Volvo Penta number from the sources reviewed.

Parts Desk Insight
Manifold anodes are small parts that are easy to ignore until corrosion starts costing real money. On gasoline engines that live in salt or brackish water, staying ahead of anode replacement is usually much cheaper than waiting for internal manifold corrosion to become a bigger repair. Volvo Penta’s own maintenance guidance also stresses the importance of genuine anodes for proper protection.

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