Yamaha - Gear Pump Assembly Engine Lubrication Component 6C5-43830-01-00. Overview. This is one of those parts you don't get a second chance with if it fails. The gear pump is what keeps oil moving through the engine, and without steady pressure, things go downhill fast. I've seen motors get noisy or run hot when these start to wear out. Keeping a solid pump in place is just part of protecting the engine and keeping it running the way it should.. Key Features. • Consistent Oil Flow - Maintains steady lubrication to protect internal engine parts.. • Precision Gear Design - Uses internal gears to deliver reliable oil pressure under load.. • OEM Fit Accuracy - Matches Yamaha factory specs for proper installation and alignment.. • Heavy Duty Construction - Built to handle heat, pressure, and continuous engine operation.. Engine & Boat Compatibility. Verify compatibility with your specific Yamaha outboard model and part number before installation.. FAQs. Q1: What are signs this oil pump is