11999904 Delivery Valve | Genuine Volvo Penta Part

🔧 Product Description

This is a genuine Volvo Penta delivery valve from the fuel system group, fitted within the injection pump to control fuel delivery to the high-pressure line. It suits TWD630ME and TWD630VE marine diesel engines. Correct valve function is essential for stable injection pressure and clean combustion.

🚤 Compatibility

Typically suits:

• Volvo Penta TWD630ME
• Volvo Penta TWD630VE

• Engine Family: TWD
• Year Range: Approximately 1980s - 1990s

⚙️ Key Features

• OEM Volvo Penta part number 11999904
• System group: Fuel System
• Net weight: 0.037 kg
• Fits TWD630 series marine diesel engines in ME and VE configurations
• Supplied as an individual delivery valve component

🔌 Function

The delivery valve sits between the injection pump element and the high-pressure fuel line, releasing a metered charge of fuel at each pump stroke and then sealing to hold residual line pressure. This prevents fuel back-flow and secondary injection, giving a sharp end to each injection event.

⚠️ Common Signs of Failure

• Rough or uneven running and misfire at idle caused by leaking or worn valve seats
• Loss of power and poor throttle response under load
• Excessive smoke from incomplete or secondary injection
• Hard starting or extended cranking due to loss of held line pressure
• Fuel leakage or pressure loss detected during injection pump testing

🛠️ Service Notes

• This is a lapped, matched assembly: keep the valve and its seat together, handle them by the ends only, and never mix parts between pumping elements
• Work in scrupulously clean conditions with clean fuel or test oil — a single particle on a lapped face will stop the valve sealing
• Fit new sealing washers and O-rings and tighten the valve holder to the figure in the workshop manual for your engine; over-tightening distorts the seat and under-tightening leaks
• Injection pump work belongs on a test bench, so have delivery and timing checked and the pump recalibrated by a diesel fuel injection specialist after fitting
• Establish why the old valve failed — water or dirt in the fuel is the usual cause, so drain and clean the tank, lines and filters before the pump goes back into service

🔄 Supersession & Cross Reference

OEM Supersession Chain

• Bosch 2 418 554 053 corresponding original-equipment valve

Other-Brand OEM Numbers

• Bosch 2 418 554 053
• Iveco 93157590

📦 Condition

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