21856211 O-Ring | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta Fuel-Regulator O-Ring - Part Number: 21856211

A genuine sealing O-ring used in the fuel-regulator and overflow-valve assembly on Volvo Penta TAD5 and TAD7 industrial engines. It prevents diesel leakage and air entry at the regulator joint.

⚙️ Key Features

• Genuine Volvo Penta factory-dimension sealing component

• Material selected for the specified fluid, gas and temperature

• Maintains pressure and prevents contamination

• Correct profile for the mating surfaces

• Single-use replacement where the joint is opened

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 21856211 (current OEM reference)

OEM / Related Numbers:

• 21638691 - fuel regulator

• 21670181 - overflow valve

• 969011 - gasket

• 21670186 / 21670190 - companion O-rings

• 21738263 - solenoid valve

• 21738265 - retaining screw

Aftermarket / Verified Equivalents:

• No aftermarket equivalent

🚤 Compatibility

Commonly used on:

• Volvo Penta TAD5 industrial diesel engine systems

Typically suits:

• Engine / drive models:

• TAD550GE, TAD551GE, TAD552GE

• TAD734GE

• TAD750GE, TAD751GE, TAD752GE, TAD753GE, TAD754GE

• HP Range: Approximately 160HP - 250HP, depending on rating

• Engine Type: 5.1L inline four-cylinder turbocharged industrial diesel

• Year Range: Approximately 2010 - 2021

• Serial / Fitment Note: Confirm the complete engine, drive or equipment product number and serial number before ordering.

🔌 Function

Seals the specified component joint to prevent fluid, gas or pressure leakage and to preserve separation between adjoining circuits.

Common signs of failure:

• Fluid, soot or air seepage around the joint

• Flattening, hardening, cracking or extrusion

• Loss of pressure or fluid level

• Cross-contamination between circuits

• Recurring leakage from damaged mating faces

📦 Condition

• Genuine Volvo Penta part

• Brand new

• Supplied in original or equivalent packaging