The Spanner / Bearing Carrier Nut 79448 is a component used in Mercury outboard lower units, specifically to secure the gearcase bearing carrier assembly.
Here’s a general overview of its role and function:
Secures the Bearing Carrier: The bearing carrier nut is used to secure the bearing carrier in place within the lower unit of the outboard motor. It ensures that the bearings and other internal components are properly held and aligned.
Prevents Movement: By tightening this nut, you prevent the bearing carrier from moving, which helps maintain proper alignment and operation of the lower unit and the drive system.
Maintains Gear Alignment: It helps keep the gears and bearings aligned, which is crucial for the efficient and smooth operation of the outboard motor.
Replacement and Maintenance: During maintenance or repair of the lower unit, it’s important to check the condition of this nut. If it’s worn or damaged, it should be replaced to ensure proper function.
Proper Torque: When reinstalling, ensure that the nut is tightened to the manufacturer’s specified torque setting to avoid any issues with the bearing carrier or the motor's performance.
If you’re working on your outboard motor and need to replace this part, ensure you have the correct specifications and follow proper installation procedures.
Measures 1/2 Thick and 4 3/8" OD. Fits all 1967 and up Mercury 135, 150, 175, 200, 225hp, 2.0, 2.4, 2.5, and 3.0, Liters including sterndrives MC, R, MR, Alpha, and Gen 2.
Replaces Mercury Marine, Quicksilver, OEM, Sierra, and EMP Aftermarket Part Numbers: 3751, 18-3751, 21120, 35912, 445-226, 509035, 52834, 775419, 79448, 8M0168577, 8M2000347, 8M2011027, 9-72155, and 79448.
Our replacement Tab Lock Washer for Mercury lower unit gearcases (OEM part number 14-79447) is a specialized component designed to secure the Bearing Carrier Spanner Nut on Mercury and Mercruiser outboard and sterndrive engines. Its primary function is to prevent the propeller nut from loosening during operation, ensuring the propeller remains firmly attached to the drive shaft.
The 14-79447 tab washer fits Mercury Marine, Mariner, Quicksilver and Mercruiser models, including:
- Mercury/Mariner V6 2.0/2.4/2.5L 135-200 HP models from 1986 to 2015.
- MerCruiser Alpha I Gen I models from 1984 to 1990.
Optional Adds:
1) Spanner Wrench for Mercury Bearing Carrier Retainer Nut; V6 Outboards, Alpha I, Gen II & Bravo I stern drives (I/O) Part Number 91-61069T
2) Tab Lock Washer for Mercury Part 14-79447