Description
Mercury 8M0187255 Propeller Bore Sleeve is a genuine OEM lower-unit sleeve designed to seal the propeller bore inside the gearcase on select Mercury outboards. It ensures exhaust and water remain properly routed, preventing ventilation, prop slip, and performance loss caused by exhaust or air leakage around the prop shaft.
Features
- OEM Fitment: Designed for 75–115 HP Command Thrust (CT) gearcases and compatible 150 FourStroke units requiring a bore seal.
- Updated Design: Superseded older 8M0054695 — new 8M0187255 uses improved plastic material and three locking tabs for secure fit and durability.
- Performance Protection: Prevents exhaust blow-by and water intrusion between propeller hub and gear housing, preserving thrust efficiency and reducing cavitation.
- Essential Maintenance Part: Should be inspected and replaced if worn or damaged each time the propeller is removed — tabs can break over time.
- Genuine OEM Quality: Manufactured to Mercury Marine standards for precise fit and long-lasting service life.
Applications
- Mercury outboards 75–115 HP with CT gearcase
- 150 HP FourStroke lower units where bore sleeve is required
Specifications
- Part Number: 8M0187255 (supersedes 8M0054695)
- Category: Gearcase & Propeller Hardware › Bore Sleeve
- Brand: Mercury
- Material: OEM-specified plastic sleeve with locking tabs
Maintain proper gearcase sealing and propeller efficiency — use Mercury 8M0187255 Propeller Bore Sleeve whenever you service or re-install your propeller.