20459139 Main Bearing | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta TAD420VE 0.25 mm Undersize Main Bearing - Part Number: 20459139

A genuine Volvo Penta main bearing used in the crankshaft main-bearing assembly. It is supplied as an individual service component under part number 20459139 and is intended to restore the original fit, alignment, sealing, support or operating function of the specified assembly. This listing supplies the named part only; adjoining components shown in an exploded view are serviced separately unless explicitly stated.

⚙️ Key Features

• Genuine Volvo Penta service component

• Designed for the crankshaft main-bearing assembly

• 0.25 mm undersize repair bearing specification

• Manufactured to the specified OEM dimensions and material requirements

• Suitable for maintenance, repair or overhaul of the matching serial-controlled assembly

• Exact engine and serial-number confirmation is recommended before installation

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 20459139 - Current genuine Volvo Penta service reference

OEM / Related Numbers:

• 20459139 - Main-bearing pair, 0.25 mm undersize

• 20459140 - Standard main-bearing reference

• 20459150 - Related crankshaft

Aftermarket / Verified Equivalents:

• VolvoKits: MBP-139 - 0.25 mm undersize main-bearing pair

🚤 Compatibility

Commonly used on:

• Volvo Penta TAD420VE and related D5 industrial diesel installations

• Serial-controlled starting, charging and rotating-engine assemblies

Typically suits:

• Engine models:

• TAD420VE

• TD420VE

• Engine Type: Volvo Penta D5 inline-four industrial diesel

• HP Range: Determined by the exact engine rating

• Year Range: Engine-generation and serial-number controlled

• Serial Applicability: Confirm the complete engine or product serial number and the exact assembly position before ordering

🔌 Function

Supports the crankshaft in the cylinder block and maintains the oil-film clearance required for smooth rotation.

Common signs of failure or reasons for replacement:

• Rumbling, knocking or roughness develops at the supported rotating assembly

• Excessive radial or axial movement is measured

• Heat, vibration or metal debris increases at the bearing location

• The bearing surface is scored, pitted, wiped or discoloured

• The supported shaft, hub or crankshaft no longer maintains correct alignment

📦 Condition

• Genuine Volvo Penta part

• Brand new

• Supplied in original or equivalent packaging