Sierra Gear Housing Seal Kit 18-2694, Replaces Evinrude/Johnson 433550, Fits Johnson/Evinrude 50-75 HP 3-Cylinder Outboard Gearcases 1979-2003

The Sierra Gear Housing Seal Kit 18-2694 is a lower unit seal kit engineered to reseal the gearcase on Johnson/Evinrude (OMC/BRP) 50-75 HP 3-cylinder outboards built from 1979 to 2003. The kit gathers the seals needed for a gear housing rebuild into a single part number, replacing the Evinrude/Johnson OEM number 433550, so a technician does not have to source individual seals separately when servicing the lower unit.

Sierra builds this kit to meet or exceed original equipment quality, with each seal engineered for a precise fit, form, and function against the gearcase housing it is designed to seal. It is intended for marine technicians and DIY boaters performing a gear housing rebuild, water pump service, or general lower unit maintenance on a compatible Johnson/Evinrude outboard, where worn or hardened factory seals need to be replaced to keep gear lube contained and water out of the lower unit.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2694
• Product Type: Gear Housing Seal Kit
• Replaces (OEM): 433550
• Fitment: Johnson/Evinrude (OMC/BRP) outboards, 50-75 HP, 3 Cylinder, 1979-2003
• Weight: 0.16 pounds
• Color: White
• Unit Count: 1
• UPC: 030999752840

Fitment

• Johnson/Evinrude (OMC/BRP) outboard gearcases, 50-75 HP, 3 Cylinder, 1979-2003

Replaces (OEM)

• 433550

Frequently Asked Questions

What does the Sierra 18-2694 gear housing seal kit fit? Sierra part 18-2694 is designed for Johnson/Evinrude (OMC/BRP) outboards rated 50-75 HP with a 3-cylinder engine, covering model years 1979 to 2003.

What OEM part number does 18-2694 replace? It replaces Evinrude/Johnson OEM number 433550.

Is this kit made by the original outboard manufacturer? No, 18-2694 is a Sierra-branded aftermarket seal kit built to meet or exceed original equipment quality as a replacement for Evinrude/Johnson part 433550, rather than a part produced by Johnson/Evinrude itself.

How much does the 18-2694 seal kit weigh? The kit weighs 0.16 pounds.

What is included in the Sierra 18-2694 kit? The kit includes one gear housing seal kit assembly (unit count of 1) containing the seals needed to reseal the gearcase on compatible Johnson/Evinrude outboards.

What color are the seals in kit 18-2694? The seals in the Sierra 18-2694 gear housing seal kit are white.

Can I use 18-2694 on a 4-cylinder Johnson/Evinrude outboard? No, 18-2694 is specified for 3-cylinder Johnson/Evinrude (OMC/BRP) outboards in the 50-75 HP range; a different Sierra part number would be needed for other cylinder configurations.

When would I need to install this seal kit? This kit is used during a gear housing (lower unit) rebuild or when servicing the gearcase on a compatible Johnson/Evinrude outboard, typically when old seals have hardened or are leaking gear lube or allowing water intrusion.

Does 18-2694 cover model years outside 1979-2003? The listed coverage for Sierra 18-2694 is Johnson/Evinrude 50-75 HP 3-cylinder outboards built from 1979 to 2003; years outside that range are not covered by this part.

Is 18-2694 the same as the water pump repair kit for these outboards? No, 18-2694 is the gear housing seal kit; the water pump repair kit for the same outboard family is a separate Sierra part number.

What is the UPC for the Sierra 18-2694 kit? The UPC for Sierra gear housing seal kit 18-2694 is 030999752840.