Sierra Outdrive Gasket Set 18-2620 for MerCruiser TR-TRS Drives, Replaces 27-54014A1

The Sierra 18-2620 Outdrive Gasket Set is a complete gasket kit engineered for MerCruiser TR and TRS stern drives, serial number 4794900 and up, specifically for drive housings equipped with an oil reservoir check valve. This set also fits 215E and 215H drive applications. It is designed to restore a proper seal at the outdrive housing during a rebuild or service job, preventing water intrusion and lubricant leakage that can lead to gear housing damage. As a direct cross-reference to Mercury Marine part numbers 27-54014A1 and 27-54014Q1, it allows technicians and boat owners to service their outdrive without hunting down original manufacturer parts. Every gasket in the set is sized and shaped to match the factory fit points on the applicable MerCruiser drive housing, so installation follows the same steps as the original equipment. Because outdrive housings vary between drive models and serial ranges, confirming your drive's serial number and check valve configuration before ordering helps ensure the correct gasket set is installed. This set is sold as a single package covering the outdrive housing service points addressed by part number 18-2620.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2620
• Product Type: Outdrive Gasket Set
• Fitment: MerCruiser TR and TRS drives, serial number 4794900 and up
• Also Fits: 215E and 215H drives
• Application Note: For housings with oil reservoir check valve
• OEM Cross Reference: 27-54014A1, 27-54014Q1
• Weight: 0.13 pounds
• UPC: 808282257972
• Package Quantity: 1 gasket set

Fitment

• MerCruiser TR-TRS drives, serial number 4794900 and up (for housings with oil reservoir check valve)
• 215E and 215H drives

Replaces (OEM)

• 27-54014A1
• 27-54014Q1

Frequently Asked Questions

What drives does the Sierra 18-2620 outdrive gasket set fit? Sierra 18-2620 is built for MerCruiser TR and TRS drives, serial number 4794900 and up, and also fits 215E and 215H drives.

Is 18-2620 the same as Mercury Marine 27-54014A1? Yes, part number 18-2620 is a direct cross-reference to Mercury Marine 27-54014A1 and 27-54014Q1, so it installs in place of either OEM number.

Does this gasket set work on any outdrive housing, or only certain ones? The 18-2620 set is intended for TR-TRS drive housings that have an oil reservoir check valve, not for every outdrive housing configuration.

How many gaskets are included in the 18-2620 set? The Sierra 18-2620 Outdrive Gasket Set is sold as a single complete set covering the outdrive housing service points for the applicable MerCruiser TR-TRS drive.

What is the shipping weight of the 18-2620 gasket set? The Sierra 18-2620 Outdrive Gasket Set weighs 0.13 pounds.

Will 18-2620 fit an Alpha One or Bravo drive? No, 18-2620 is specified for TR and TRS drives; Alpha One and Bravo drives use different gasket set part numbers.

How do I confirm my drive matches the 4794900-and-up serial range for this gasket set? Check the serial number tag on your MerCruiser TR-TRS drive housing; 18-2620 applies to units at serial number 4794900 and up with an oil reservoir check valve.

Is the Sierra 18-2620 gasket set genuine Sierra or a generic aftermarket part? 18-2620 is a genuine Sierra part, manufactured as a direct cross-reference to the Mercury Marine 27-54014A1 and 27-54014Q1 outdrive gaskets.

What is the UPC for the Sierra 18-2620 outdrive gasket set? The Sierra 18-2620 Outdrive Gasket Set carries UPC 808282257972.

When would I need to replace the outdrive gaskets on a TR-TRS drive? The 18-2620 gasket set is used any time the outdrive housing on a MerCruiser TR-TRS drive is opened for service, since the original gaskets should not be reused once disturbed.