This high-quality 3-piece crankshaft oil seal kit (Mercury Part #41953) is engineered for precision sealing and long-lasting performance on Mercury and Mariner 2-stroke outboard motors. Designed to replace the crankshaft top and bottom seals, this kit includes one (1) new seal for the top cap and two (2) new seals for the bottom cap—ensuring a reliable, leak-free seal on both ends of the crankshaft.
 
Broad Engine Compatibility
 
This crankshaft seal kit is compatible with a wide range of Mercury Marine and Mariner 2-stroke outboard engines, specifically models from 30 horsepower up to 300 horsepower. It fits all 2.0L, 2.4L, and 2.5L V6 powerheads, making it suitable for both recreational and high-performance applications. Whether you're maintaining a fishing boat or rebuilding a performance engine, this kit is built to meet OEM specifications.
 
The seal kit also fits Mercury SportJet engines, including the 175 HP, 210 HP, and 240 HP models. These engines are commonly used in jet boats and other high-thrust watercraft that demand reliable internal sealing and crankcase integrity.
 
Common Mercury and Mariner Outboard Applications
 
This oil seal kit is ideal for use in some of Mercury's most popular and enduring 2-stroke outboards. In the 2.0-liter V6 category, it is commonly used in 135HP and 150HP models, including performance variants such as the XR2, XR4, and XR6.
 
In the 2.4-liter range, it supports engines like the 175HP and 200HP models, as well as the 220HP Laser EFI. For 2.5-liter V6 powerheads, it is compatible with 225HP, 250HP, 260HP, 280HP, and the high-performance 300HP Mercury Racing engines.
 
This same kit also serves Mariner-branded 2-stroke outboards across these engine sizes and displacements. Mercury SportJet engines, which include the 175, 210, and 240HP configurations, also use this crankshaft seal kit. These engines are popular in jet-powered applications where durability and high-output performance are critical.
 
Compatible OEM Part Numbers
 
To ensure a perfect match for your rebuild or repair, this crankshaft oil seal kit replaces several genuine Mercury and Mariner part numbers. These include 20079, 25837, 29476, 313992, 41953, 41953B, 508514, 764337, and 777914. Each seal in the kit meets or exceeds OEM specifications for fit, material quality, and performance.
 
Dependable Performance for Mercury 2-Stroke Powerheads
 
Whether you're performing a routine service or a complete engine overhaul, this crank oil seal kit delivers OEM fit and function. It is trusted by marine mechanics, boat owners, and outboard rebuilders for its durability, compatibility, and ease of installation across a broad range of Mercury 2-stroke engines.
 
With proper crankshaft sealing, your outboard maintains optimal compression, prevents oil leaks, and prolongs engine life, especially under the demanding conditions faced on the water.
 
For technical support, contact Mike Hill at mike@buckshotracing77.com or call +1-714-697-1716