20459850 Rocker Arm | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta rocker arm from the Engine group, weighing 0.15 kg and listed for 3 fitments across the TD and TAD series.

🚤 Compatibility

Typically suits:

• Volvo Penta TD420VE
• Volvo Penta TAD620VE
• Volvo Penta TAD420VE

• Engine Family: TD, TAD

⚙️ Key Features

• Rocker arm
• 0.15 kg
• Engine group
• Listed for 3 fitments across the TD and TAD series
• Quantity varies by assembly, most commonly 8

🔌 Function

Transfers push-rod movement to the valve, opening it against its spring and holding the intended valve lift.

⚠️ Common Signs of Failure

• Tapping or knocking from the valve gear, worst when cold
• Valve clearances drifting out of specification between services
• The rocker pad found worn, pitted or scuffed where it meets the valve
• The bore or shaft worn, giving side play at the rocker
• That cylinder down on power or running unevenly

🛠️ Service Notes

• Check the push-rod tip and the valve stem end for matching wear, as a worn rocker pad rarely wears alone
• Reset the valve clearances after fitting and check them again once the engine has been run and heat-cycled

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 20459847 - Related rocker-shaft brackets
• 20459848 - Related rocker-shaft brackets
• 20459849 - Related rocker-shaft brackets
• 20459851 - Related valve spring
• 20459852 - Related valve seats
• 20459854 - Related valve seats
• 20459855 - Related valve stem seal
• 20459835 - Related cylinder-head cover

📦 Condition

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