21305007 Piston | Genuine Volvo Penta Part

🔧 Product Description

Volvo Penta lists this part as the piston kit supplied inside its published overhaul kit 3809772, for TD420VE, TAD420VE.

⚙️ Key Features

• Standard-size piston
• Correct combustion-bowl and ring-groove design
• One piston required per cylinder
• Engine type: Four-cylinder turbocharged industrial diesel
• Listed by Volvo Penta as the piston kit in its overhaul kits
• 4 off in overhaul kit 3809772 (TD420VE, TAD420VE)
• Used in overhaul kits: 3809772 x4 (TD420VE, TAD420VE)

🔌 Function

Receives combustion pressure and transfers force through the connecting rod to the crankshaft.

⚠️ Common Signs of Failure

• Piston slap
• Cracked crown or skirt
• Broken ring lands

🛠️ Service Notes

• Measure the bore or liner and check it against the piston, using the size and class markings and the tolerances given in the workshop manual for your engine; pistons and bores are matched, and a worn bore needs attention before a new piston goes in
• Fit rings with the marked face up and the gaps staggered as the manual specifies, use a proper ring compressor, and oil the piston, rings and bore before entering them
• Observe the orientation markings on the piston and the pairing marks between piston and connecting rod so each assembly goes back in its own cylinder the right way round
• Use new pin retaining clips or circlips, check the pin fit and the rod bearing shells, and confirm the piston moves freely on the pin as the manual describes
• Where the manual calls for a piston protrusion or crown height check to select the gasket, carry it out before final assembly; then turn the engine over by hand to confirm free movement before starting
• Volvo Penta's overhaul kits call for 4 off of this part

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21305007 → Supersedes 20460013

OEM / Related Numbers

• 20460013 earlier number superseded by this part

Aftermarket / Verified Equivalents

• Olsson Parts 41056 standard piston for references 20460013 and 21305007

📦 Condition

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