Sierra 18-2094 Oil Seal, Replaces 30-60794A2, Fits Mercruiser 1, R, MR and Alpha Stern Drives 1974-97

The Sierra 18-2094 is a greasable oil seal engineered for Mercruiser stern drive units, sold to meet or exceed original equipment quality. It is designed as a direct replacement for the factory seal on Mercruiser 1, R, MR, and Alpha model stern drives built through the 1974-97 range, restoring the seal that keeps water out and lubricating grease in around the drive shaft. Each unit is greasable, allowing fresh grease to be worked into the seal during service to extend its working life and protect against water intrusion at the gimbal/drive shaft interface.

This part is packaged so that one 18-2094 seal and one 18-2100 seal are included together, since Mercruiser stern drive service on these units typically calls for replacing both seals as a set. The white-finished seal cross-references directly to Mercury Marine part numbers 30-60794A2, 30-60794A4, and 30-879194A02, so it drops into the same location as those OEM numbers without modification. It is a straightforward maintenance item for anyone performing gimbal bearing, drive shaft, or U-joint service on a compatible Mercruiser stern drive, and is commonly replaced any time the drive is disassembled for other repair work to ensure a fresh, reliable seal is in place.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2094
• Category: Mercruiser Internal Engine Parts
• Color: White
• Design: Greasable
• Kit Contents: Contains one each of 18-2094 and 18-2100
• Fitment: Mercruiser 1, R, MR and Alpha stern drives (1974-97)
• OEM Cross Reference: 30-60794A2, 30-60794A4, 30-879194A02
• Weight: 0.11 pounds
• UPC: 808282185206

Fitment

• Mercruiser 1, R, MR and Alpha stern drives (1974-97)

Replaces (OEM)

• 30-60794A2
• 30-60794A4
• 30-879194A02

Frequently Asked Questions

What does the Sierra 18-2094 oil seal fit? The Sierra 18-2094 is designed for Mercruiser 1, R, MR and Alpha model stern drives (1974-97), sealing the drive shaft area to keep water out and grease in.

What OEM part numbers does the 18-2094 replace? It cross-references directly to Mercury Marine numbers 30-60794A2, 30-60794A4, and 30-879194A02, so it installs in place of any of those factory numbers.

Does the 18-2094 come with anything else in the package? Yes, this package contains one each of the 18-2094 and 18-2100 seals, since these two are typically replaced together during stern drive service.

Is the Sierra 18-2094 seal greasable? Yes, the 18-2094 is a greasable design, meaning fresh grease can be worked into the seal to help maintain its seal against water intrusion over time.

How much does the 18-2094 oil seal weigh? The Sierra 18-2094 weighs 0.11 pounds.

What color is the Sierra 18-2094 seal? The 18-2094 has a white finish.

Is the Sierra 18-2094 a genuine OEM part or an aftermarket replacement? It is a Sierra-manufactured replacement part built to meet or exceed original equipment quality, cross-referenced to Mercury Marine OEM numbers 30-60794A2, 30-60794A4, and 30-879194A02 rather than being sold under the Mercury Marine brand itself.

When would I need to replace the 18-2094 seal? This seal is typically replaced whenever a compatible Mercruiser 1, R, MR or Alpha stern drive is disassembled for gimbal, drive shaft, or U-joint service, or when the existing seal shows wear that could let water in.

Do I need special tools to install the 18-2094? Installation follows standard Mercruiser stern drive disassembly and reseal procedures for the 1, R, MR and Alpha model drives that the 18-2094 is designed for.

Is the 18-2094 seal sold as a single seal or a pair? The 18-2094 package contains one each of the 18-2094 and 18-2100 seals, so both are included together rather than sold as two separate 18-2094 units.

What is the UPC for the Sierra 18-2094? The Sierra 18-2094 oil seal has UPC 808282185206.