21534993 Rocker Arm Shaft | Genuine Volvo Penta Part

🔧 Product Description

A precision-machined rocker arm shaft fitted in the cylinder-head valve mechanism of selected Volvo Penta TAD16 generating-set engines. It supports the rocker arms in their correct operating positions and distributes lubricating oil through the rocker assembly.

🚤 Compatibility

• Engine Family: TAD, TWD, D
• HP Range: 145-175 HP

Full model list at the end of this description.

⚙️ Key Features

• Genuine Volvo Penta valve-train component
• Precision-machined rocker bearing surfaces
• Internal lubrication passages for the rocker assembly
• Designed for TAD16 combustion and valve-spring loads
• Uses expansion plug 955096 at the shaft end
• Engine type: 16.1 L inline-six turbocharged generating-set diesel

🔌 Function

Provides the accurately aligned pivot surface and lubricating-oil supply required by the valve and injector rocker arms.

⚠️ Common Signs of Failure

• Rocker or valve-train ticking
• Excessive rocker-arm radial or side clearance
• Scoring, pitting or bluing on the shaft journals
• Restricted oil delivery to the rocker arms
• Uneven valve lift or injector actuation

🛠️ Service Notes

• Check the shaft and the rocker bushes for wear, scoring and ovality and measure them against the figures in the manual for your engine — a worn shaft will ruin new rockers
• Make sure the oil feed holes in the shaft are clear and face the way the procedure for your engine specifies, and that the supply drilling in the head or pedestal is clear; a blocked or misaligned feed starves the whole rocker gear
• Rebuild the shaft in its original order and orientation, keeping rockers, spacers, springs and pedestals in the positions they came from
• Coat the shaft and bushes with clean engine oil before assembly and turn the assembly by hand to confirm every rocker moves freely
• Tighten the pedestals down evenly and in stages so the shaft is not pulled out of straight, then set the valve clearances by the procedure for your engine and prime the valve gear with oil before starting

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21534993 → Supersedes 24426580

OEM / Related Numbers

• 24426580 earlier number superseded by this part
• 955096 - expansion plug

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D16C1-E MG, D16C1-F MG, D16C2-E MG, D16C2-F MG, D16C-D MH, D16C1-E MH, D16C1-F MH, D16C2-E MH, D16C2-F MH
• Volvo Penta TAD1640-42GE-B, TAD1640VE-B, TAD1640-42VE-C
• Volvo Penta D4-175I-G, D4-145I-G
• Volvo Penta TAD1650VE-B/51VE, TAD1650GE
• Volvo Penta TWD1683GE-B, TWD1683VE
• Volvo Penta TAD1641VE-B
• Volvo Penta TAD1642VE-B
• Volvo Penta TAD1643VE-B
• Volvo Penta TAD1651GE
• Volvo Penta TAD1660-62VE
• Volvo Penta TAD1662VE EU5
• Volvo Penta TAD1670-72VE
• Volvo Penta TWD1644-45GE
• Volvo Penta TWD1652GE
• Volvo Penta TWD1653GE
• Volvo Penta TWD1672-1673GE
• Volvo Penta TWD1682-83GE
• Volvo Penta TWD1744GE