21274781 Gear | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta precision timing gear used in the gear train on D2-55F and D2-75F marine engines. The gear maintains the correct phase relationship between the crankshaft, camshaft and fuel-injection drive.

🚤 Compatibility

Typically suits:

• Volvo Penta D2-55
• Volvo Penta D2-55B
• Volvo Penta D2-55C
• Volvo Penta D2-55D
• Volvo Penta D2-55E
• Volvo Penta D2-55F
• Volvo Penta D2-50F
• Volvo Penta D2-75
• Volvo Penta D2-75B
• Volvo Penta D2-75C
• Volvo Penta D2-75F
• Volvo Penta D2-60F

• Engine Family: D
• HP Range: 50-75 HP

⚙️ Key Features

• Genuine Volvo Penta hardened timing gear
• Confirmed D2-55F and D2-75F fitment
• Precision tooth form and timing-mark location
• Maintains valve and injection timing
• Inspect mating gears and backlash during replacement
• Engine type: Volvo Penta D2 four-cylinder marine diesel

🔌 Function

Transfers crankshaft rotation through the timing train at the exact ratio required for camshaft and injection operation.

⚠️ Common Signs of Failure

• Whine, rattle or knock from the timing-gear end of the engine
• Rough running, hard starting or a loss of power as timing drifts
• Timing marks no longer aligning once the covers are off
• Chipped, pitted or scuffed teeth and excessive backlash found on inspection
• Metal particles in the oil or on the sump magnet

🛠️ Service Notes

• Supersedes 21188964
• Inspect the mating gears, bearings and backlash before fitting, as a worn partner gear will quickly destroy a new one
• Set and recheck the timing marks carefully on reassembly

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21274781 → Supersedes 21188964

OEM / Related Numbers

• 21188964 earlier number superseded by this part
• 3580532 - timing-gear reference used on earlier D2 configurations; not assumed interchangeable

📦 Condition

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