20482741 Inlet Valve | Genuine Volvo Penta Part

🔧 Product Description

Standard-size inlet valve for Deutz-derived Volvo Penta D4D/D6D and related TAD engine cylinder heads. Documented dimensions are approximately 119.3 mm overall length, 41.7 mm head diameter and 8 mm stem diameter, with a 30-degree seat.

🚤 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 inlet valve
• Hard starting, rough running or reduced power
• Bent, burnt, recessed or pitted valve face
• Poor cylinder filling caused by a valve that does not open or seat correctly

🛠️ Service Notes

• Keep valves in order and fit each one to the seat it is lapped to; a new valve must be lapped in until a continuous, even contact band shows right round
• Check the guide for wear before fitting a new valve — a good valve in a worn guide will not seat or seal for long
• Clean the deposits from the port and seat, wash every trace of lapping paste out of the head, and lubricate the stem with clean engine oil on assembly
• Fit new stem seals and check installed spring height and valve recess against the figures in the workshop manual for your engine
• Set the valve clearances on assembly and re-check them after the first running period, following the procedure for your engine

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 20482741 → Supersedes 20791517 → Supersedes 20459862

OEM / Related Numbers

• 20791517 earlier number superseded by this part
• 20459862 earlier number superseded by this part

Other-Brand OEM Numbers

• Deutz: 04283376
• Deutz: 04254934

Aftermarket / Verified Equivalents

• OE Germany: 040520201200
• OE Germany: 03 0520 600000
• SLP: ILV-741

📦 Condition

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