20482742 Exhaust Valve | Genuine Volvo Penta Part

🔧 Product Description

Standard-size exhaust valve for Deutz-derived Volvo Penta D4D/D6D and related TAD engine cylinder heads, with documented Volvo and Deutz cross-reference numbers.

🚤 Compatibility

• HP Range: Approximately 300 HP
• Year Range: Approximately late 1990s-2000s

⚙️ Key Features

• OEM valve head, stem length and seat-angle specification
• Maintains combustion sealing and correct intake or exhaust gas flow
• Designed for high-cycle cylinder-head operation and temperature exposure
• Requires valve-guide, seat and spring inspection during installation
• Suitable for professional cylinder-head overhaul
• Engine type: Deutz-derived four- and six-cylinder turbocharged Volvo Penta diesel

🔌 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 cylinder leakage through the exhaust valve
• Hard starting, rough running or reduced power
• Burnt, bent, recessed or pitted valve face
• Abnormal valve clearance, exhaust-valve noise or rising exhaust temperature
• Exhaust smoke or poor cylinder performance caused by incomplete valve sealing

🛠️ Service Notes

• Keep valves in strict order as they come out so anything reused goes back in its own guide and seat, and measure stem, guide and seat wear against the figures in the workshop manual for your engine before deciding what to reuse
• Check a new valve for straightness and check that the seat face is clean and unmarked before it goes anywhere near the head
• Clean carbon from the port and the seat, then grind or lap the valve to its seat and confirm a continuous, even seating band right round
• Renew the valve stem seals, cotters and any spring hardware the manual calls for while the head is apart — the cost is trivial against a second strip-down
• Check valve recession or protrusion relative to the head face, and clearance to the piston, against the manual figures for your engine before final assembly, then set the valve clearances to the manual figures once the head is back on and recheck them after the first running period

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 20482742 → Supersedes 20791405 → Supersedes 20459861

OEM / Related Numbers

• 20791405 earlier number superseded by this part
• 20459861 earlier number superseded by this part

Other-Brand OEM Numbers

• Deutz: 04254285
• Deutz: 04283377

Aftermarket / Verified Equivalents

• OE Germany: 040520201201
• SLP: EXV-742
• SRP: EV-82742

📦 Condition

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