A general guideline is to inspect the belt during every oil change and plan for replacement every 3-5 years or as recommended in your Yanmar service manual
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The alternating pressure (pulse) created by the piston's movement inside the crankcase actuates a diaphragm inside the pump
Both should be serviced regularly
Carefully remove the lower magnetic drain plug screw
Water Pump Impeller – Fits Yamaha 20HP & 25HP (Replaces 6L2-44352-00-00, 18-3065) 75-100 EFI A general guideline is toProduct Details This Water Pump Impeller Fits Yamaha 20HP & 25HP Outboards (Replaces 6L2 44352 00 00) is engineered for specific Yamaha 2 stroke 20HP (19961997) and 25HP (19882009) engines, as well as 4 stroke F20 (20182021) and F25 (20162021) outboard motors. It serves as a direct interchange for Yamaha 6L2 44352 00 00, Sierra 18 3065, Mallory Marine 9 45613, GLM Marine 89622, SEI Marine 95 499 03G 96 499 03G, OBR Red Rhino YA 111, CEF Marine 500384,