Description

The Volvo Penta 852866 is a genuine Volvo Penta OEM flat washer used as diagram-specific structural hardware on select Volvo Penta sterndrive, transom shield, and mounting assemblies. This washer is used where the Volvo Penta parts diagram calls for 852866, helping distribute clamp load across the specified mounting hardware stack in transom, shield, drive, or bracket locations.

Key Features

• Genuine Volvo Penta factory OEM flat washer.
• Volvo Penta part number: 852866.
• Used as load-spreading hardware in select Volvo Penta transom shield and sterndrive mounting assemblies.
• Commonly associated with mounting stud and lock nut hardware stacks where specified by the Volvo Penta diagram.
• Helps maintain correct clamping surface area around high-load fastener locations.
• Intended for structural marine hardware positions where a generic washer should not be substituted.
• Related hardware references may include 963108 lock nut and 873316 mounting stud where shown in the same diagram.

Application Compatibility

Common where-used application groups include select Volvo Penta drive and transom shield assemblies by serial number and diagram location, including:

• AQ-series transom shield and drive assemblies where specified
• 280 / 290 / 290DP drive and transom applications where specified
• SP-C / SP-E transom shield applications where specified
• DP-C / DP-D / DP-E transom shield applications where specified
• DPH-A / DPH-B transom shield applications where specified
• DPR-A / DPR-B transom shield applications where specified
• Select Volvo Penta diesel and gasoline engine installations using the matching transom shield mounting hardware

Use this washer only where the Volvo Penta parts diagram specifically calls for 852866.

Fitment Notice

Confirm fitment by Volvo Penta drive model, transom shield assembly, engine serial number, hardware location, and exact parts diagram before ordering. Volvo Penta uses similar flat washers across multiple shield, mounting, bracket, and drive assemblies, and the correct washer depends on the stud size, washer stack, and structural location shown in the diagram.

When This Part Needs Replacement

Replace this washer if it is missing, bent, corroded, grooved, cracked, distorted, flattened unevenly, or damaged during disassembly. Washers used in transom shield and sterndrive mounting locations should not be reused if they no longer sit flat or distribute clamp load evenly across the mounting surface.

Installation Notes

Install this washer in the exact hardware position shown in the Volvo Penta diagram. Inspect the matching mounting stud, lock nut, backing surface, transom shield, inner transom plate, bracket, and surrounding hardware before reassembly. Do not substitute a thinner or smaller generic washer in a structural transom or drive-mounting location. Follow the Volvo Penta service manual for the correct washer placement, torque value, and hardware replacement requirements.

Alternate/Superseded Part Numbers

• 852866 — Volvo Penta flat washer
• 963108 — related lock nut reference; verify by diagram
• 873316 — related mounting stud reference; verify by diagram

Parts Desk Insight

Transom shield washers are small parts, but they play an important role in maintaining proper clamp load across the drive mounting hardware. If the washer is distorted or substituted with the wrong size, the hardware stack may not seat correctly, so matching the washer by Volvo Penta part number and diagram location is the safest approach.

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