Description

The Mercury MerCruiser Quicksilver 26-45587 is a genuine Mercury Marine OEM oil seal used in select vintage MerCruiser transom, bell housing, and related sterndrive assembly locations. This seal is used where the factory parts diagram calls for 45587 / 26-45587, helping retain lubricant and protect the surrounding assembly from oil leakage at the specified sealing point.

Key Features

• Genuine Mercury Marine factory OEM oil seal.
• Mercury/MerCruiser part number: 26-45587.
• Manufacturer part number: 45587.
• Component class: Mercury 26-series seal/gasket part.
• GTIN/UPC: 745061152908.
• Used in select vintage MerCruiser bell housing, transom, and sterndrive sealing locations where specified by the factory diagram.
• Intended for oil sealing service where the original seal is worn, hardened, leaking, or removed during disassembly.

Application Compatibility

Common application context includes select early MerCruiser sterndrive and transom assemblies by serial number and diagram location, including:

• MerCruiser Model 90 Renault 96 I/L4 applications where specified
• Select early 1970–1972 inline 4-cylinder MerCruiser configurations where the parts diagram calls for 26-45587 / 45587
• Vintage bell housing or transom assembly sealing locations where this exact seal number is shown

Use this seal only where the MerCruiser parts diagram specifically calls for 26-45587 / 45587.

Fitment Notice

Confirm fitment by engine model, drive/transom serial number, bell housing configuration, and exact Mercury/MerCruiser parts diagram before ordering. Vintage MerCruiser assemblies can use different seals, gaskets, retainers, and housing components depending on production range and original drive configuration.

When This Part Needs Replacement

Replace this oil seal if lubricant is seeping from the bell housing or related sealing area, if the seal lip is hardened, cracked, cut, swollen, or distorted, or whenever the seal is removed during disassembly. Old seals in vintage housings often lose elasticity over time and should not be reused once disturbed.

Installation Notes

Clean the seal bore and mating surface before installation, and inspect the shaft or sealing surface for grooves, corrosion, pitting, or wear. A damaged sealing surface can cause a new seal to leak again. Install the seal squarely and to the correct depth using the MerCruiser service procedure for the specific transom or bell housing assembly. Replace related gaskets, washers, or retainers shown in the same diagram if they are worn or damaged.

Alternate/Superseded Part Numbers

• 26-45587 — Mercury/MerCruiser formatted part number
• 45587 — Manufacturer part number

Parts Desk Insight

Vintage MerCruiser seals should be matched by the original parts diagram rather than by diameter or appearance alone. Small differences in lip style, casing depth, or installed position can affect how the seal runs on the shaft or housing surface, especially on older Renault-based MerCruiser assemblies.

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