21291112 Piston | Genuine Volvo Penta Part

🔧 Product Description

Volvo Penta lists this part as the piston kit supplied inside its published overhaul kit 3884935, for TAD650VE.

🚤 Compatibility

Typically suits:

• Volvo Penta TAD650VE

• Engine Family: TAD

⚙️ Key Features

• Replaces earlier piston 20849999
• Correct combustion-bowl and ring-groove specification
• One piston required per cylinder
• Engine type: Six-cylinder turbocharged industrial diesel
• Listed by Volvo Penta as the piston kit in its overhaul kits
• 6 off in overhaul kit 3884935 (TAD650VE)
• Used in overhaul kits: 3884935 x6 (TAD650VE)

🔌 Function

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

⚠️ Common Signs of Failure

• Excessive crankcase blow-by
• Piston slap or internal knocking
• Scored or cracked piston skirt
• Broken ring lands
• High oil consumption or blue exhaust smoke

🛠️ 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 6 off of this part

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21291112 → Supersedes 20849999

OEM / Related Numbers

• 20849999 earlier number superseded by this part
• 04284390 related reference
• 04501383 related reference

Other-Brand OEM Numbers

• Kolbenschmidt 40441600 piston supplied with rings and piston pin
• Kolbenschmidt 40441960 piston and cylinder-liner repair kit
• Kolbenschmidt 40441961 piston and cylinder-liner repair kit

📦 Condition

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