20405797 Support Ring | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta Alternator Support / Back-Up Ring - Part Number: 20405797

Genuine Volvo Penta support ring used in an alternator mounting and pulley-retention assembly. This component is also known as a back-up ring or plain support washer.

⚙️ Key Features

• Alternator support or backing ring

• Function group 3219 - alternator mounting hardware

• Supports the pulley, spacer or mounting interface

• Distributes load and maintains the specified spacing

• Must be installed in the original orientation and position

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 20405797 - current Volvo Penta support/back-up ring reference

OEM / Related Numbers:

• 21801402 - related alternator in one documented arrangement

• 20460360 - related alternator bracket

• 20593398 - related tensioner

• 20593394 - related pulley

Aftermarket / Verified Equivalents:

• No aftermarket equivalent

🚤 Compatibility

Commonly used on:

• Volvo Penta alternator mounting and pulley assemblies

Typically suits:

• Engine / equipment models:

• Volvo Penta alternator assemblies using support ring 20405797

• Engine Type: Alternator-specific Volvo Penta diesel applications

• Year / Serial Range: Alternator, bracket and pulley configuration dependent

🔌 Function

Provides the required support, spacing or load distribution within the alternator mounting or pulley assembly.

Common signs of failure:

• Pulley or bracket axial play

• Washer/ring grooving or deformation

• Alternator misalignment

• Repeated belt wear

• Loose or incorrectly spaced mounting

📦 Condition

• Genuine Volvo Penta part

• Brand new

• Supplied in original or equivalent packaging