Starboard Trim Cylinder Assembly MerCruiser Alpha One Gen 2
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Quicksilver Starboard Trim Cylinder Assembly MerCruiser Alpha One Gen 2
The Quicksilver 8M0118959 is a genuine OEM starboard (right-side) power trim cylinder assembly designed specifically for MerCruiser Alpha One Generation 2 sterndrive outdrives. As part of the hydraulic power trim system, this cylinder extends and retracts to raise and lower the drive unit, allowing precise on-the-water trim adjustment for optimal boat performance and fuel efficiency. This is a genuine Quicksilver/Mercury Marine OEM replacement part — not an aftermarket substitute — ensuring exact fitment and long-term reliability.
This assembly ships with all necessary components and includes an overhaul kit (87399A3), a seal kit (87400A2), and an anode (806189Q1). It is sold individually as a single starboard cylinder. If the port (left-side) cylinder also requires replacement, the companion part number is 8M0118958. Replace promptly if the cylinder is leaking, seized, or failing to hold trim position, as delayed replacement can lead to drive damage and loss of trim control on the water.
Key Features
- Genuine Quicksilver/Mercury Marine OEM replacement part — not aftermarket
- Starboard (right-side) power trim cylinder assembly
- Designed for MerCruiser Alpha One Generation 2 sterndrive outdrives
- Sold individually (single cylinder)
- Direct OEM fit for precise installation and long-term reliability
- Includes overhaul kit 87399A3, seal kit 87400A2, and anode 806189Q1
- Supersedes part numbers 815954A7 and 815954A3
- Cross-references: Sierra Marine 18-2423, GLM 26520, SEI 9B-116-01
- Companion port-side cylinder: 8M0118958
- Weight: 5.63 lbs; Dimensions: 4.50" L x 4.50" W x 25.50" H
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