21849618 O-Ring | Genuine Volvo Penta Part

🔧 Product Description

Sealing O-ring used in the Volvo Penta installation of the optional Knorr 360 cc single-cylinder air compressor. It seals the assigned compressor or connection joint against air, oil or crankcase leakage.

🚤 Compatibility

• Engine Family: TAD, D, TADH

Full model list at the end of this description.

⚙️ Key Features

• Knorr 360 cc one-cylinder air-compressor application
• Factory cross-section and diameter
• Suitable for compressor operating temperature
• Direct replacement seal
• Use lubricant and torque specified for the joint
• Engine type: Heavy-duty industrial diesel with 360 cc single-cylinder air-compressor option

🔌 Function

Seals the specified air-compressor joint so system pressure and lubricant remain contained.

⚠️ Common Signs of Failure

• Air or oil leakage at the joint
• Pressure loss from the compressor circuit
• Flattened, cut or hardened seal
• Leak recurring after compressor removal
• Visible extrusion or chemical damage

🛠️ Service Notes

• Always fit a new O-ring — never refit one that has been removed, as it has already taken a set in its groove
• Clean the groove and both sealing faces and check them for nicks, scoring and corrosion pitting; a damaged groove will leak however good the new seal is
• Smear the ring with a little clean lubricant compatible with the fluid it seals, then roll it into place by hand so it sits untwisted and fully in its groove
• Never lever an O-ring over a sharp edge or thread with a screwdriver; use a blunt plastic tool and protect any edge the ring has to pass
• Assemble the joint squarely and tighten to the figure and sequence given in the workshop manual for your engine — over-tightening extrudes the ring and causes the very leak you were curing

📦 Condition

• Genuine Volvo Penta part
• Brand new
• Supplied in original or equivalent packaging

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D8A2-A MP, D8A5-A MH, D8A6-A MH, D8A5-A MG, D8A6-A MG, D8A1-A MP, D8A3-A MP, D8A4-A MP
• Volvo Penta TAD840GE, TAD840-43VE, TAD840GE-B
• Volvo Penta TAD570-72VE, TAD570-71VE-B
• Volvo Penta TAD880-82GE, TAD880-84VE
• Volvo Penta TADH880-82GE, TADH880-84VE
• Volvo Penta TAD540-42VE
• Volvo Penta TAD550-51VE
• Volvo Penta TAD552VE
• Volvo Penta TAD580-83VE
• Volvo Penta TAD841-43GE
• Volvo Penta TAD850-52VE
• Volvo Penta TAD851-53GE
• Volvo Penta TAD853VE
• Volvo Penta TAD870-73VE