MerCruiser Alpha Series Sterndrive Gasket and O Ring Install Kit Eight Piece

Restore seal integrity and protection for your MerCruiser Alpha Series stern drives with the MerCruiser Alpha Series Sterndrive Gasket and O Ring Install Kit Eight Piece. This complete eight-piece installation kit is designed to deliver precise fitment, reliable sealing, and long-lasting performance in harsh marine conditions. After replacement, expect a tight installation that guards against water ingress and oil leaks, helping you avoid costly drive damage.

Engineered for reliability, this kit fits MerCruiser stern drives in the Alpha One Gen II (1991–1997) and R/MR/Alpha One (1983–1990) families, for engines with serial numbers 6225577 and above. It replaces a range of OE parts and Sierra references to provide a seamless, DIY-friendly refresh that stands up to salt, spray, and engine vibration. The components are crafted from asbestos-free paper pads and rubber, delivering corrosion resistance and moisture-proof sealing for extended life in marine environments.

Each box delivers a comprehensive set that simplifies maintenance. With precise design and exact matching, the gaskets and O-rings work together to restore proper alignment, sealing, and sealing surface protection—crucial for maintaining peak drive performance on the water.

All electronic and mechanical equipment, devices and machines sold by InterCyprus to EU countries are CE certified and carry a two year warranty.

At intercyprus.com since 2002 — trusted for quality and reliability.

Benefits & Tips

• Use this eight-piece kit to refresh the bell housing and mounting interfaces on MerCruiser Alpha Series drives, restoring a factory-like seal and reducing the risk of water intrusion and oil leakage.
• The asbestos-free materials and rubber O-rings are built to withstand marine moisture and corrosion, helping extend the life of your stern drive between maintenance intervals.
• Verify compatibility with your engine’s serial number range (Alpha One Gen II 1991–1997; R/MR/Alpha One 1983–1990) and the listed OEM/Sierra references to ensure a smooth, confident install DIY approach or when coordinating with a marine technician.

Product specifications

• Complete eight-piece installation gasket kit for MerCruiser Drives
• Fits MerCruiser stern drive engines: Alpha One Gen II 1991–1997; R/MR/ Alpha One 1983–1990 (Serial numbers 6225577 and above)
• Replaces OEM part numbers: 27-94996, 27-949962, 27-94996Q2, 27-94996A1, 27-94996A2, 27-94996T2, 27-64818A2, 27-64818A3, 27-64818Q4, 27-02386
• Replaces Sierra 18-2619-1
• Material: asbestos-free paper pads and rubber; corrosion-resistant and moisture-proof
• Size: 29 × 19 × 3 cm
• Weight: 0.18 kg
• Origin: Mainland China
• Protection function: precise design ensures perfect matching and, after replacement, good sealing and tight installation

Package includes:

• 1x 18-2743/27-94996T2/27-64818T4 Outdrive Mounting Gasket
• 1x 18-2840 27-35982 Bell Housing Gasket
• 4x 25-25439 O-Rings
• 1x 25-35027 O-Ring
• 1x 25-33504 O-Ring

Warnings/Reminders

• Note: All items are Brand New unless stated otherwise. We sell DIY (Do It Yourself) items with a few exceptions.
• We take no responsibility for teaching you how to install; professional installation is strongly recommended.

All electronic and mechanical equipment, devices and machines sold by InterCyprus to EU countries are CE certified and carry a two year warranty.

Providing quality and trusted service since 2002 at intercyprus.com