Boat bellows are essential flexible rubber components used in the stern drive system to protect critical parts from water intrusion and wear. They enclose and seal the exhaust, shift cable, and u-joints, preventing leaks and ensuring smooth operation of the outdrive.
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1-2 weeks delivery time Price incl. 19% VAT Specifically designed for 3.0-liter Mercruiser manifold applications, this gasket kit ensures a perfect fit and reliable performance, replacing part number 27-53354A1, and is branded by Sierra with product number 18-4398.
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€ 36,74
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1-2 weeks delivery time Price incl. 19% VAT This comprehensive gasket set for Yamaha 6H1 powerheads contains all essential gaskets and O-rings for a complete rebuild, featuring multiple components including head gaskets and O-rings, and is branded by Sierra with product number 18-4405.
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€ 118,57
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1-2 weeks delivery time Price incl. 19% VAT Designed for Johnson and Evinrude outboards, this powerhead gasket kit ensures compatibility and reliability in internal engine systems, replacing OMC/Bombardier part number 437155, and is branded by Sierra with product number 18-4406.
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€ 280,64
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1-2 weeks delivery time Price incl. 19% VAT Essential for maintaining the performance of your Yamaha engine, this head gasket kit is branded by Sierra with product number 18-4415 and features original reference 688-W0001-A0-00 for model 85.
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€ 150,09
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1-2 weeks delivery time Price incl. 19% VAT This gasket kit guarantees a perfect seal for Yamaha engines, preventing leaks and enhancing efficiency, with original reference 6H3-W0001-A0-00 for model 70, and is branded by Sierra with product number 18-4427.
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€ 226,46
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1-2 weeks delivery time Price incl. 19% VAT Designed to provide optimal sealing for your Yamaha engine, this powerhead gasket set is branded by Sierra with product number 18-4434.
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€ 167,42
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1-2 weeks delivery time Price incl. 19% VAT This reliable lower unit drain gasket is suitable for Yamaha and Mercury engines, ensuring a secure seal and preventing leaks, with original references including 27-81987 and 604-45342-00-00, and is branded by Sierra with product number 18-4698.
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€ 2,75
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1-2 weeks delivery time Price incl. 19% VAT Designed for both Yamaha and Mercury engines, this pack of 50 drain gaskets provides excellent sealing performance, with original references including 27-81917 and 90430-08003-00, and is branded by Sierra with product number 18-46981-9.
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€ 137,34
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1-2 weeks delivery time Price incl. 19% VAT This set of five O-rings is essential for maintaining the integrity of various Mercruiser engine models and is compatible with models R, MR, and Alpha I, produced by Sierra under product number 18-7169-9.
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€ 22,06
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1-2 weeks delivery time Price incl. 19% VAT The Johnson/Evinrude Base Gasket Kit is designed for 40 to 60 horsepower models, ensuring reliable sealing for optimal performance, manufactured by Sierra under product number 18-74108.
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€ 41
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1-2 weeks delivery time Price incl. 19% VAT These O-Rings provide effective sealing for various marine engines, compatible with Johnson, Evinrude, Mercury, and Mercruiser models, produced by Sierra under product number 18-7440-1-9.
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€ 4,18
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1-2 weeks delivery time Price incl. 19% VAT This Lower Unit Gasket Kit is specifically designed for Yamaha 9.9 and 15HP engines from 1984 to 1991, ensuring a secure fit and effective sealing, manufactured by Sierra under product number 18-74501.
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€ 103
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1-2 weeks delivery time Price incl. 19% VAT The Gear Housing Seal Kit is designed for various Yamaha Outboards, providing a reliable seal for optimal performance and containing multiple essential components, produced by Sierra under product number 18-74504.
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€ 84,42
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1-2 weeks delivery time Price incl. 19% VAT This Gear Housing Seal Kit is specifically crafted for Yamaha 9.9 and 15 HP outboards from 1997 to 2000, providing essential sealing components for enhanced reliability, manufactured by Sierra under product number 18-74507.
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€ 121,07
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1-2 weeks delivery time Price incl. 19% VAT This Gear Housing Seal Kit is essential for maintaining the performance of Yamaha outboard engines, fitting models L225/L250 (1997-99), LX225/LX250 (2000-03), S225/S250 (1997-99), and SX225/SX250 (2000-03), manufactured by Sierra under product number 18-74510.
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€ 148,82
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1-2 weeks delivery time Price incl. 19% VAT Designed specifically for Yamaha V200, V225, VX200, and VX225 HP outboard engines, this seal kit is interchangeable with Mallory 9-74512 and Yamaha part number 66K-W0001-20-00, produced by Sierra under product number 18-74512.
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€ 180,47
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1-2 weeks delivery time Price incl. 19% VAT This Gear Housing Seal Kit is compatible with Yamaha F100 (1999-2003), F80 (1999-2003), and F90 (2003) engines, and it is interchangeable with Mallory 9-74535 and Yamaha part number 67F-W0001-20-00, manufactured by Sierra under product number 18-74535.
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€ 248,56
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1-2 weeks delivery time Price incl. 19% VAT The Sierra 18-74540 Seal Kit is crafted for Yamaha F40 HP (1999), F50 HP (1995-2000), and T50 HP (1996-1997) outboard engines, containing essential components for effective sealing and interchangeable with Mallory 9-74540 and Yamaha part number 62Y-W0001-20-00.
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€ 167,42
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1-2 weeks delivery time Price incl. 19% VAT This Lower Unit Seal Kit is essential for maintaining the integrity of your engine, produced by Sierra under product number 18-74610.
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€ 49,96
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1-2 weeks delivery time Price incl. 19% VAT This Lower Unit Seal Kit replaces Nissan/Tohatsu part number 346-87321-6 and is compatible with models 25 (1997-05) and 30 (1997-03), manufactured by Sierra under product number 18-74611.
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€ 50,08
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What are the different types of boat bellows and their specific uses?
Boat bellows come in three main types: exhaust bellows, shift cable bellows, and u-joint bellows, each serving a specific function in a stern drive system. Exhaust bellows direct engine exhaust away from the boat through the drive, while shift cable bellows protect the shift cable from water intrusion and prevent leaks. U-joint bellows shield the universal joints and gimbal bearing from moisture and debris, helping to prevent rust and ensuring smooth operation of the outdrive.
Why is it important to regularly inspect and maintain boat bellows?
Regular inspection and maintenance of boat bellows are essential to prevent water intrusion and protect key components like the gimble bearing and shift cable. Cracks or dry bellows can lead to leaks, causing damage to the bell housing and requiring costly repairs. Using the right tools, such as an expander tool and socket, allows mechanics to carefully remove and replace worn bellows, ensuring the stern drive operates smoothly and the transom remains sealed against sea exposure.
In what marine environments do boat bellows experience the most wear and tear?
Boat bellows experience the most wear and tear in saltwater environments due to constant exposure to corrosion, UV rays, and marine growth. Frequent check and maintenance are necessary in high-motion conditions, such as rough waters or areas with heavy boat traffic, where the mount and clamp connections endure significant strain. Proper access to the bellows for inspections and timely pull and replacement of worn-out units can prevent leaks and potential drivetrain damage.