20859733 Cylinder Head Gasket | Genuine Volvo Penta Part

🔧 Product Description

A genuine Volvo Penta 1.25 mm cylinder-head gasket for the applicable D5-series engine build. It provides the combustion seal and separates the cylinder-head coolant and oil passages while maintaining the piston-to-head clearance specified for the measured engine configuration.

🚤 Compatibility

Typically suits:

• Volvo Penta TAD560VE
• Volvo Penta TAD561VE

• Engine Family: TAD

⚙️ Key Features

• Genuine Volvo Penta 1.25 mm Cylinder Head Gasket - part number 20859733
• Nominal 1.25 mm thickness option for the specified cylinder-head installation
• Reinforced combustion sealing around each cylinder
• Precisely located coolant, oil-feed and oil-return openings
• Thickness forms part of the engine's mechanical clearance specification
• Select by piston protrusion, original gasket identification and serial number
• Cylinder-head and block surfaces must be flat, clean and free from old coating
• Engine type: D5-series electronically controlled industrial diesel engines
• TH=1.25mm (Volvo assembly listing)

🔌 Function

The gasket creates three independent sealing zones: combustion chambers, pressurised oil passages and the coolant jacket. The 1.25 mm build thickness is used where the measured piston protrusion and engine specification require the thicker option.

⚠️ Common Signs of Failure

• Coolant loss with no obvious external leak
• Bubbles or abnormal pressure in the expansion tank
• Low compression or misfire after warm-up
• Repeat head-joint leakage from incorrect gasket selection or surface finish

🛠️ Service Notes

• Establish why the old gasket failed before fitting a new one — overheating, a distorted or cracked head, a corroded block face or a stretched fastener will destroy the new gasket in the same way
• Have the head and block faces checked for flatness and for the surface finish the gasket requires; clean them with plastic or hardwood scrapers and solvent rather than power tools or abrasives, which round the edges of the joint and drop grit into the bores
• Make sure both faces, the bolt holes and the coolant passages are clean and dry, and wipe or blow debris out of the cylinders before the head goes on
• Fit the gasket dry and the right way round, following any orientation marking on it, and use no sealant or jointing compound unless the workshop manual for your engine specifically calls for it
• Use new head bolts wherever the manual requires them — many are designed to stretch and cannot be reused — and tighten in the sequence, stages and angles the manual gives, then carry out any re-tension or valve clearance check it specifies

🔄 Supersession & Cross Reference

Other-Brand OEM Numbers

• VOE20859733

📦 Condition

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