20405577 Piston Pin | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta fully floating piston pin used to connect each piston to its connecting rod on the D5/D7 industrial engine family. Four pins are used on four-cylinder engines and six on six-cylinder engines, with two retaining snap rings per pin.

🚤 Compatibility

• Engine Family: D, TD, TAD, MD

Full model list at the end of this description.

⚙️ Key Features

• Hardened precision-ground piston pin
• Four used on D5 four-cylinder engines and six on D7 six-cylinder engines
• Works with piston, connecting rod and snap rings 20405576
• Must be checked for diameter, ovality and surface scoring
• Piston and connecting-rod small-end clearances must meet the workshop specification
• Engine type: Volvo Penta four- and six-cylinder industrial diesel

🔌 Function

Provides the articulated bearing connection between the piston and connecting rod while transmitting combustion load.

⚠️ Common Signs of Failure

• Piston-pin knock
• Scoring, blueing or material transfer
• Excessive small-end or piston-bore clearance
• Cracked or displaced retaining snap ring
• Metallic debris during engine overhaul

🛠️ Service Notes

• Measure before assembling: pin, piston bore and rod bush must all be checked against the wear limits in the workshop manual for your engine, and a pin that has picked up or lost its finish is scrap
• Assemble spotlessly clean and generously oiled with clean engine oil or the specified assembly lubricant; a dry pin galls on the first turn of the engine
• Confirm piston and rod are the correct way round and correctly paired before the pin goes in
• Where the manual specifies a warm fit, warm the piston evenly by the method it sets out and push the pin home in one movement — never drive a pin in with a hammer
• Fit new circlips or retaining rings, compress them no more than needed to enter the bore, seat them squarely in the groove, and check each is fully home and cannot be rotated by finger pressure

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 20405576 - retaining snap rings
• 20412762 - cylinder-liner O-rings
• 20585982 - related connecting rod
• 3843536 - related cylinder-liner kit

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D7A-B TA, D7A-T, D7A-TA, D7C-B TA, D7C-TA
• Volvo Penta D5A-B TA, D5A-T, D5A-TA
• Volvo Penta MD2010, MD2010B
• Volvo Penta TAD520GE, TAD520VE
• Volvo Penta TAD530GE MECH, TAD530GE EDC4
• Volvo Penta TAD531GE MECH, TAD531GE EDC4
• Volvo Penta TAD720GE, TAD720VE
• Volvo Penta TAD721GE, TAD721VE
• Volvo Penta TAD722GE, TAD722VE
• Volvo Penta TAD730GE MECH, TAD730GE EDC4
• Volvo Penta TAD731GE MECH, TAD731GE EDC4
• Volvo Penta TAD750GE, TAD750VE
• Volvo Penta TD520GE, TD520VE
• Volvo Penta TD720GE, TD720VE PP
• Volvo Penta TAD532GE EDC4
• Volvo Penta TAD550GE
• Volvo Penta TAD551GE
• Volvo Penta TAD732GE EDC4
• Volvo Penta TAD733GE EDC4
• Volvo Penta TAD751GE
• Volvo Penta TAD760VE