21455743 Plug | Genuine Volvo Penta Part

🔧 Product Description

A genuine plug used in the cylinder-head and valve-train assembly of Volvo Penta TAD650VE and TAD660VE engines.

🚤 Compatibility

Typically suits:

• Volvo Penta TAD550GE
• Volvo Penta TAD551GE
• Volvo Penta TAD750GE
• Volvo Penta TAD751GE

• Engine Family: TAD

⚙️ Key Features

• Correct OEM thread and sealing dimensions
• Closes the designated cylinder-head passage
• Replaces or corresponds with earlier plug 20405895
• Used in quantities of six on designated cylinder-head assemblies
• Designed for engine heat and pressure
• Quantity varies by assembly, most commonly six

🔌 Function

The plug closes a casting, oil or machining passage in the cylinder head.

⚠️ Common Signs of Failure

• Oil or coolant seepage
• Plug loosening
• Cracked sealing area
• Rounded installation drive

🛠️ Service Notes

• Clean the threads and the seating face before fitting, and make sure the opening itself is clear of old sealant, swarf and corrosion
• Renew the sealing washer or O-ring where one is fitted rather than reusing a flattened one, and only use thread sealant where the workshop manual for your engine calls for it
• Tighten to the figure given in the workshop manual for your engine — plugs in aluminium and other soft castings strip easily, and a plug pulled up hard to cure a leak usually distorts the seat and makes it worse
• Where the plug closes an oil, fuel or coolant passage, run the engine up to temperature afterwards and check the joint under pressure before signing the job off
• Keep removed plugs paired with the holes they came out of during a strip-down — plugs of very similar appearance often differ in thread, reach or sealing type

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21455743 → Replaces or corresponds with 20405895

OEM / Related Numbers

• 20405895 - Earlier plug reference

📦 Condition

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