Yamaha - Dog Clutch - 6FM-45631-00-00

Overview

The Yamaha Dog Clutch | 6FM-45631-00-00 is one of those parts that makes or breaks how clean your engine shifts. When it starts to wear down, you’ll usually hear it first—grinding, slipping, or hard engagement going into gear. It’s what locks the gears together inside the lower unit, so it has to stay sharp and properly aligned. If your shifting doesn’t feel solid anymore, this is often a key piece to look at.

Key Features

• Positive Gear Engagement – Locks gears together securely for reliable forward and reverse operation.

• OEM Fit Precision – Built to Yamaha specifications for proper alignment and smooth gear interaction.

• Smooth Shifting Support – Helps reduce grinding and improves gear transition feel.

• Heavy-Duty Construction – Designed to handle torque, load, and repeated marine use.

Compatibility

Compatible with select Yamaha outboard engines using this dog clutch configuration.
Commonly found in Yamaha lower units requiring precise gear engagement for shifting.
Always confirm compatibility using your engine model and part number.

FAQs

Q1: What are signs the dog clutch is worn out?
A: Grinding during shifting, slipping out of gear, or difficulty engaging forward or reverse are common signs.

Q2: Can a worn dog clutch damage other parts?
A: Yes, it can wear down gears and lead to more serious lower unit damage if not addressed.

Q3: Is this a difficult part to replace?
A: It usually requires opening the lower unit, so proper tools and experience are important.

Q4: Does shifting technique affect this part?
A: Yes, firm, clean shifts help reduce wear compared to slow or hesitant shifting.

Q5: Should I replace other components at the same time?
A: It’s a good idea to inspect gears, bearings, and seals while everything is apart.

• Supersessions
  664-45631-04-00, 664-45631-03-00, 664-45631-02-00, 664-45631-01-00, 664-45631-00-00