Cylinder Block Kit Trim MERCURY 75-115Cv (2 and 4-Stroke) 8M0089941

Overview

The MERCURY 75-115Cv Trim Cylinder Barrel Kit (2- and 4-stroke) is the structural component of the trim cylinder in which the rod slides and the seals are housed. Perforations or internal wear render the seals ineffective, causing persistent leaks even with a new seal kit. Replacing just this part helps avoid the cost of a complete trim assembly.

Technical Specifications

New-design Mercury Mariner trim cylinder barrel for trim assembly 8M0090335, 8M0171818

• 75, 90 3-Cylinder 2-Stroke
• 75, 90, 115 DFI (3-cyl 2-stroke)
• 75, 80, 90, 100, 115 EFI (4-stroke)

Part Numbers: 8M0089941

Verification recommended using engine serial number

Recommended conditions of use

Drain and remove the affected cylinder. Unscrew the cylinder head, remove the rod, then remove the barrel. Check the condition of the rod before reassembly. Install the new barrel with the supplied seals, reassemble the unit, fill and bleed the system.

Technical Benefits

• Cost-effective, targeted repair without replacing the entire trim assembly
• Precision-machined bore for leak-free rod movement
• Corrosion resistance thanks to surface treatment
• Genuine Mercury part number for an exact fit with the cylinder

Usage and Maintenance Tips

• Replacement Frequency: Replace if the bore shows scratches or corrosion that would prevent a lasting seal.
• Best Practices: Rinse the outside of the cylinder with fresh water after each use in saltwater.
• Precautions for use: Avoid any impact to the bore when handling. Use only Mercury hydraulic oil.

Frequently Asked Questions

How can I tell if a worn cylinder is the cause of a leak, or if the seals are failing?

If replacing the seals does not resolve the leak, inspect the cylinder’s inner bore: longitudinal scratches or pitting from corrosion require replacement of the cylinder.

Can the existing rod be reused with a new barrel?

Yes, if the rod is free of scratches. A damaged rod would quickly wear out the seals on the new barrel. Visually inspect the entire length before reusing it.

Is this barrel compatible with both Mercury designs (old/new model)?

No, the old and new designs are not interchangeable. Check the part number of the installed trim assembly before ordering.