Yamaha F6 Anode Replacement

Sacrificial anodes are the cheap parts that protect the expensive metal on your 6 hp Yamaha F6 from galvanic corrosion. Below is the exact anode that fits, a step-by-step video, and answers to the zinc-vs-aluminium question.

✓ Recommended for the Yamaha F6
18-6019 — Sierra 18-6019

Check today’s price on Amazon →

✓ Fitment cross-referenced from OEM catalogs · ✓ Step-by-step video above · ✓ Fast Amazon shipping & easy returns — verify your model code before ordering

Watch: how to do it (step by step)

How to Replace Anode – Yamaha F4B

Yamaha Outboard F2.5A, F4B, F5A, F6C 2015 Onwards – How To Check Thermostat & Engine Anode

Tools Needed

  • M10 socket
  • Phillips head screwdriver
  • Air pliers (optional)
  • Warm water for testing

Safety

  • Ensure the engine is cool before starting.
  • Be cautious with the grounded bolt.

Steps

  1. Remove the cowl by unscrewing the three M10 bolts.
  2. Take note of the water outlet and any other components for proper reassembly.
  3. Remove the thermostat housing by unscrewing the bolts, ensuring the grounded bolt is noted.
  4. Move any cables out of the way to access the anode and thermostat.
  5. Unscrew the anode using a Phillips head screwdriver.
  6. Remove the thermostat using air pliers if necessary.
  7. Clean the thermostat and check for any buildup or corrosion.
  8. Test the thermostat in warm water to ensure it opens correctly.
  9. Replace the anode with a new one if available.
  10. Replace the thermostat and the gasket.
  11. Reassemble the thermostat housing with the new gasket.
  12. Reattach the cowl with the three M10 bolts, including the grounded bolt.

Tips

  • A fairly new engine should not have significant issues with the thermostat or anode.
  • The replacement gasket is made of a cork-like material.
  • The job is easy to do yourself with basic tools.

Which part do I need for my Yamaha F6?

For most F6 owners the part above (18-6019) is the right choice. Price tip: the aftermarket numbers are usually noticeably cheaper than the OEM-branded box — it is the same physical part. If you need an exact match, these compatible part numbers also fit:

Show all compatible part numbers (24)
Part number Description
18-6020 (1969-89) 45-300 HP Find on Amazon →
18-60527 Sierra 18-60527 Find on Amazon →
18-60528 Sierra 18-60528 Find on Amazon →
18-6096 Sierra 18-6096 Find on Amazon →
18-6096A Sierra 18-6096A Find on Amazon →
18-6097 Sierra 18-6097 Find on Amazon →
18-6097A Sierra 18-6097A Find on Amazon →
18-6097M Trim Tab Anode – Magnesium Find on Amazon →
18-6111 Sierra 18-6111 Find on Amazon →
18-6118 Internal Engine Anode Find on Amazon →
18-6118A Sierra 18-6118A Find on Amazon →
18-6120 Lower Unit Anode Find on Amazon →
18-6120A Sierra 18-6120A Find on Amazon →
18-6120Z Sierra 18-6120Z Find on Amazon →
62Y-11325-00-00 052 Find on Amazon →
65W-45251-00-00 049 Find on Amazon →
66M-11327-00-94 COVER 052 Find on Amazon →
66M-12535-00-00 052 Find on Amazon →
66M-24374-00-00 052 Find on Amazon →
67C-45251-00-00 052 Find on Amazon →
67C-45371-00-00 052 Find on Amazon →
68T-11325-00-00 049 Find on Amazon →
68T-45251-00-00 052 Find on Amazon →
6G8-11325-00-00 052 Find on Amazon →

Many of these are the same physical part under different brand numbers. Confirm against your engine plate before ordering.

Frequently asked questions

What anode fits a Yamaha F6 (6 hp)?

The Yamaha F6 uses the anode sold as 18-6019, plus its OEM and aftermarket cross-references (24 compatible numbers are listed above). Confirm the number against your engine's model code and year plate before ordering.

How often should I replace the anode on a Yamaha F6?

Inspect your anodes at least once a season and replace them once they are about half eaten away.

Zinc, aluminium or magnesium anodes?

Zinc and aluminium anodes are for saltwater (aluminium also works in brackish water); magnesium is for freshwater only. Pick one type and use it consistently across the engine — mixing types reduces protection.

What happens if the anodes on a Yamaha F6 wear out?

Galvanic corrosion starts attacking the propeller, gearcase and trim hardware instead — repairs that cost far more than a set of anodes. Anodes are consumables; replacing them on time is the whole point.

How long does an anode change take on a Yamaha F6?

Typically well under an hour with basic hand tools — one of the easiest DIY jobs on the engine. The video above shows where each anode sits.

Ready to fix it?
Get the 18-6019 anode for your Yamaha F6.

Check today’s price on Amazon →

Own a Yamaha?
See what your boat is actually worth — instant AI valuation based on thousands of comparable European sales.

Get your free valuation →

Related guides

As an Amazon Associate we earn from qualifying purchases — at no extra cost to you. Prices and availability are shown at checkout. This guide is for reference; always follow the engine manufacturer’s service manual.