21458899 Adjusting Screw | Genuine Volvo Penta Part

🔧 Product Description

A later-production valve-clearance adjusting screw used in the rocker-arm assembly of Volvo Penta TAD560VE and TAD760-series engines.

🚤 Compatibility

Typically suits:

• Volvo Penta TAD765VE
• Volvo Penta TAD764VE
• Volvo Penta TAD763VE
• Volvo Penta TAD762VE
• Volvo Penta TAD761VE

• Engine Family: TAD
• Serial Range: SN5311033258-

⚙️ Key Features

• Precision valve-clearance adjustment
• Hardened contact end
• Fine-thread adjustment
• Later serial-number specification
• Used with inlet and exhaust rocker arms

🔌 Function

The screw establishes the specified running clearance between the rocker arm and valve-train component.

⚠️ Common Signs of Failure

• Adjustment will not remain set
• Pitted contact face
• Incorrect valve clearance
• Rounded adjustment head

🛠️ Service Notes

• Note and record the existing setting before disturbing anything, so you have a reference to return to if needed
• Release the lock nut fully before turning the screw, then reset the lock nut and re-check the setting — tightening the lock nut usually moves the adjustment
• Set to the clearance or position given in the workshop manual for your engine using the correct feeler or gauge; do not judge the setting by feel
• Inspect the tip and the threads and renew any screw with a worn, mushroomed or picked-up tip, because a worn tip makes the setting drift in service
• Never use an adjusting screw to force a component into position, and carry out a hot re-check after running if the manual for your engine calls for one

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21458899 - Used from engine serial 5311033258 onward
• 20861870 - Earlier adjusting screw used through serial 5311033257

OEM / Related Numbers

• 20861870 - Earlier adjusting screw
• 21458892 - Inlet rocker arm
• 21458904 - Exhaust rocker arm

📦 Condition

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