21549544 Oil Filter | Genuine Volvo Penta Part

🔧 Product Description

A long-canister full-flow oil filter used on Volvo Penta MD21 and MD2000-series marine diesel engines. The approximately 120mm-high body provides increased filter-media capacity where installation clearance permits.

🚤 Compatibility

Typically suits:

• Volvo Penta MD21B
• Volvo Penta AQD21B

• Engine Family: MD, AQD

⚙️ Key Features

• Approximate canister height: 120mm
• Full-flow lubricating-oil filtration
• High contaminant-holding capacity
• Correct spin-on thread and sealing gasket
• Long-body alternative to shorter filter 3840525 on applicable engines

🔌 Function

The filter removes metallic wear debris, soot and other contaminants from the pressurised engine-oil supply before the oil reaches bearings and valve-train components.

⚠️ Common Signs of Failure

• Oil seepage at the sealing gasket
• Low oil pressure caused by restriction or incorrect fitment
• Canister corrosion or impact damage
• Filter overdue for replacement
• Old gasket remaining on the filter head during servicing

🛠️ Service Notes

• Have a container and absorbent to hand and catch what the filter holds, so nothing goes into the bilge
• Wipe the filter head clean, make sure the old sealing ring has come away with the old filter, and lightly oil the new filter's seal before fitting
• Screw the filter on until the seal meets the face, then tighten by hand only, to the amount given for your engine; an over-tightened filter distorts the seal and is a fight to remove next time
• Never fit a filter that has been dropped or dented, and keep the sealing face and threads free of grit
• Start the engine, watch for oil pressure to come up, then check round the filter for leaks and re-check the oil level once it has drained back

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21549544 → Supersedes 3581621 → Supersedes 861475 → Supersedes 3580454

OEM / Related Numbers

• 3581621 earlier number superseded by this part
• 861474 earlier number superseded by this part
• 861475 earlier number superseded by this part
• 3580454 earlier number superseded by this part
• 3580228 related reference
• 3840525 - Shorter related filter

Other-Brand OEM Numbers

• MANN-FILTER W 713/18
• Baldwin: B178
• Mahle: OC47
• MANN-Filter: W719/5
• Wix Filters: 51348

Aftermarket / Verified Equivalents

• RECMAR REC3581621
• Hifi Filter: SO11097

📦 Condition

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