20798533 Exhaust Valve | Genuine Volvo Penta Part

🔧 Product Description

Precision cylinder-head valve-mechanism component used in the common-rail d5/d7 cylinder-head and valve mechanism. It maintains the intended gas-flow, sealing or spring-control function through the engine cycle.

🚤 Compatibility

Typically suits:

• Volvo Penta TAD650VE
• Volvo Penta TAD660VE

• Engine Family: TAD
• HP Range: Approximately 320 HP
• Year Range: Approximately 2000s-2010s

⚙️ Key Features

• Exhaust valve, 0.120 kg
• Supersedes 21739319
• Listed for 2 TAD applications
• The matching inlet valve is 20798699 at 0.134 kg

🔌 Function

Opens and closes the cylinder-head gas port at the correct point in the engine cycle and seals against the valve seat during compression and combustion.

⚠️ Common Signs of Failure

• Low compression or leakage past the valve seat
• Hard starting, rough running or reduced power
• Burnt, bent, recessed or pitted valve face
• Incomplete gas sealing or restricted cylinder breathing

🛠️ Service Notes

• Check the guide and seat while the valve is out - a new valve into a worn guide will burn again
• Inlet and exhaust valves are not interchangeable; 20798699 is the inlet

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 20798533 → Supersedes 21739319

OEM / Related Numbers

• 21739319 earlier number superseded by this part
• 23095755 later cylinder-head reference
• 20849976 inlet valve seat
• 20849979 exhaust valve-seat insert
• 20459855 valve-stem seal
• 20459851 valve spring
• 20840747 spring disc
• 20459857 valve cotter
• 20840807 thrust washer
• 20792103 snap ring
• 20850047; 20850048; 20850049 graded head gaskets

OEM Reman Alternatives

• 3801133 and 3801894 exchange/new cylinder-head references

Aftermarket / Verified Equivalents

• SRP: EV-98533
• Olsson Parts: 51459
• Freccia: R6675/RCR
• Syncparts: 01-1533
• OE Germany: 04 0520 201203

📦 Condition

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