Description

Mercury MerCruiser Quicksilver 25-23145 is a genuine Mercury Marine O-ring used as a sealing ring in select Mercury, Mariner, MerCruiser, Mercury Racing, trim/tilt, and drive-related assemblies. Mercury parts references identify this part as O-RING (.984 x .139), with base manufacturer part number 23145.

Key Features

• Genuine Mercury Marine / Quicksilver O-ring reference
• Size reference: .984 in. x .139 in.
• OEM part number: 25-23145
• Base part reference: 23145
• GTIN / UPC reference: 745061131088
• Catalog package reference: approximately 1.50 in. x 1.40 in. x 0.30 in.
• Catalog weight reference: approximately 0.01 lb

Engine Compatibility

This O-ring appears across a wide range of Mercury and MerCruiser parts diagrams, including select older 5 HP, 9.9 HP, 15 HP, 6-cylinder Mercury outboards, classic MerCruiser sterndrive engines such as 120/140, 165, 225-S, 228, 233, 250, 260, 470, 485, 888, and 898, early sterndrive assemblies, Mercury Racing dry-sump / SSM / NXT applications, and trim / tilt / lift system component groups depending on serial number and diagram location.

Serial Number Fitment Notice

O-ring fitment depends on the exact engine, drive, trim system, component group, and serial number range. Always confirm compatibility using the Mercury or MerCruiser serial number and the exact parts diagram before ordering, especially because 25-23145 appears in many different assemblies.

When This Part Needs Replacement

Replace this O-ring whenever the related assembly is opened, or if the original seal is flattened, cut, brittle, swollen, cracked, missing, or no longer sealing properly. Reusing a compressed or damaged O-ring can lead to leaks and repeat service.

Installation Notes

Clean the O-ring groove and mating surface before installation. Lightly lubricate the O-ring with the service-manual-approved lubricant where specified, and make sure it seats evenly without twisting, stretching, rolling, or pinching during assembly. Confirm the exact diagram location before installation because this O-ring has broad Mercury and MerCruiser usage.

Alternate/Superseded Part Numbers

• 25-23145
• 23145
• 25-843315
• 843315
• F702736
• Volvo Penta 125017 — related cross-reference in supported applications
• OMC / Johnson / Evinrude 0302540, 0320140, 0508486, 0777563, 0908096, 302450, 302540
• Sierra 18-7114
• Sierra 18-7178
• GLM 82140

Parts Desk Insight

This is a broad-use Mercury sealing ring, so the safest match is the exact parts diagram callout. The size is important, but diagram location matters just as much because the same O-ring can appear in different engines, drives, and trim assemblies.

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