471706 Reduction Valve | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta reduction valve mounted between cylinders 4 and 5, from the Lubricating and Oil System group, weighing 70.3 g and listed for 31 applications across D and TWD series engines. It consolidates part numbers 21068158, 22192217 and 421125, the last of which was catalogued earlier as a reducing valve.

🚤 Compatibility

• Engine Family: D, TWD
• HP Range: 145-480 HP

Full model list at the end of this description.

⚙️ Key Features

• Mounted between cylinders 4 and 5
• 70.3 g
• Consolidates 21068158, 22192217 and 421125
• 31 applications across D and TWD engines

🔌 Function

Limits oil pressure in the gallery at its position by lifting against its spring once the set pressure is reached.

⚠️ Common Signs of Failure

• Oil pressure high, low or unstable
• Valve stuck open so pressure never builds
• Valve seized shut, giving pressure spikes
• Debris on the seat so the valve weeps
• Spring collapsed or broken

🛠️ Service Notes

• Position is the identifier here - this valve sits between cylinders 4 and 5, and it weighs the same 70.3 g as the Yellow valve 471707 and the White piston cooling valve 471646, so weight cannot separate them
• Check the seat and the bore in the block while the valve is out

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 471706 → Supersedes 21068158

OEM / Related Numbers

• 22192217 earlier number superseded by this part
• 421125 earlier number superseded by this part
• 21068158 earlier number superseded by this part

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D6-340I-G, D6-380I-G, D6-440I-G, D6-480I-G, D6-300A-G, D6-340A-G, D6-380A-G, D6-440I-WJ-G, D6-480I-WJ-G, D6-300D-G, D6-340D-G, D6-380D-G, D6-440D-G, D6-480D-G, D6-400A-G, D6-440A-G, D6-300I-G, D6-480A-G
• Volvo Penta D4-175I-G, D4-230I-G, D4-270I-G, D4-320I-G, D4-300I-G, D4-150A-G, D4-230A-G, D4-270A-G, D4-320A-G, D4-300A-G, D4-145I-G, D4-175 VG
• Volvo Penta TWD1744GE