Description

The Mercury MerCruiser Quicksilver 87400A2 Trim Cylinder O-Ring Kit is an 11-piece seal kit used to service select MerCruiser sterndrive trim cylinders. It replaces the O-rings inside one trim cylinder, helping restore proper hydraulic sealing and reduce trim-cylinder leakage. This kit is commonly used on supported R, MR, Alpha One, Alpha One Gen II, and Bravo trim cylinder applications.

Key Features

• Genuine Mercury / Quicksilver trim cylinder O-ring kit
• Part number: 87400A2
• Full Mercury reference: 25-87400A2
• 11-piece O-ring replacement kit
• Services one trim cylinder
• Designed for select MerCruiser sterndrive power trim cylinders
• Helps repair hydraulic fluid leakage at trim cylinder seals
• Used with supported R, MR, Alpha One, Alpha One Gen II, and Bravo drive trim systems
• UPC reference: 745061202122

Drive Compatibility

This O-ring kit is intended for select MerCruiser R, MR, Alpha One, Alpha One Gen II, and Bravo sterndrive trim cylinders. It is trim-cylinder specific, so compatibility depends on the exact drive model, trim cylinder style, and serial number range.

Serial Number Fitment Notice

Trim cylinder seal fitment varies by drive generation, trim cylinder design, and serial number. Always confirm compatibility using the MerCruiser drive serial number and trim cylinder parts diagram before ordering, especially when comparing early Alpha, Alpha Gen II, Bravo, and replacement trim cylinder assemblies.

When This Part Needs Replacement

Replace this O-ring kit when a trim cylinder is leaking hydraulic fluid, drifting down, losing trim pressure, or showing worn, hardened, cut, or flattened seals during service. Trim cylinders should also be resealed if they are already apart and the existing O-rings are aged or damaged.

Installation Notes

Service one trim cylinder at a time and keep the internal parts in order during disassembly. Clean the cylinder bore, rod, cap, and seal grooves before installing the new O-rings. Inspect the trim rod for pitting or scoring, since damaged rod surfaces can quickly ruin new seals. Refill and bleed the power trim system according to the MerCruiser service procedure after reassembly.

Alternate/Superseded Part Numbers

• 87400A2
• 25-87400A2
• Mercury 87400A2
• Mercury Marine 25-87400A2
• Quicksilver 87400A2
• Trim Cylinder O-Ring Kit
• Trim Cylinder Seal Kit

Parts Desk Insight

This kit services one trim cylinder, so two kits may be needed if both port and starboard trim cylinders are being rebuilt. The key match is the trim cylinder style and drive serial number, because similar-looking MerCruiser trim rams can use different seal arrangements.

Shipping: Ships same or next day for fast Canada wide shipping.