21578873 Ball Bearing | Genuine Volvo Penta Part

🔧 Product Description

Drive-side precision ball bearing supporting the shaft of the belt-driven Volvo Penta D13 seawater pump.

🚤 Compatibility

Typically suits:

• Volvo Penta D13B-E MG
• Volvo Penta D13B-E MG (FE)
• Volvo Penta D13B-E MH
• Volvo Penta D13B-E MH (FE)
• Volvo Penta D13B-F MG
• Volvo Penta D13B-F MG (FE)
• Volvo Penta D13B-N MH
• Volvo Penta D13B-N MH (FE)
• Volvo Penta D13C1-A MH
• Volvo Penta D13C2-A MH
• Volvo Penta D13C1-B MG
• Volvo Penta D13C3-B MG
• Volvo Penta D13C2-A MG
• Volvo Penta D13C1-A MG
• Volvo Penta D13C3-B MH
• Volvo Penta D13C1-B MH

• Engine Family: D

⚙️ Key Features

• Installed at the drive/pulley side
• Supports radial belt load
• Maintains pulley and shaft alignment
• Works with bearing 21578878
• Individual component for pump overhaul
• Engine type: 12.8-litre inline-six turbocharged marine diesel

🔌 Function

Supports the pump shaft at the pulley side and permits smooth rotation under belt load.

⚠️ Common Signs of Failure

• Grinding, rumbling or squealing from the pump
• Pulley wobble or excessive shaft play
• Repeated shaft-seal leakage
• Axial movement or component walking out of position
• Seized pump, low seawater flow or thrown drive belt

🛠️ Service Notes

• Work clean — leave the bearing in its wrapping until the moment it goes in, and do not wash the preservative out or blow it dry with compressed air
• Apply the fitting force only to the ring being fitted, through a tube or drift that bears on that ring alone; force pushed through the balls from one ring to the other dents the raceways and the bearing will be noisy and short-lived from the first run
• Where the fit calls for it, expand the inner ring with even, controlled heat rather than driving it on, and never heat a bearing with a flame or beyond the temperature given in the workshop manual for your engine
• Check the shaft and housing seats before fitting — scoring, burrs, corrosion or a worn seat will ruin a new bearing, and fretting marks mean the seat itself needs attention
• Fit the bearing square and fully home against its shoulder, note which way round any sealed, shielded or marked face must go, and lubricate with the grease or oil specified for the application before it is turned under load

🔄 Supersession & Cross Reference

Other-Brand OEM Numbers

• VOE21578873

Aftermarket / Verified Equivalents

• Seawater pump: 21347696
• Repair kit: 21911061

📦 Condition

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