21860425 Common Rail | Genuine Volvo Penta Part

🔧 Product Description

A genuine high-pressure fuel rail used in the common-rail injection system on Volvo Penta TAD540-42VE industrial engines. It distributes pressurised diesel fuel to the four injectors and carries the rail-pressure sensor.

🚤 Compatibility

Typically suits:

• Volvo Penta TAD552VE
• Volvo Penta TAD550-51VE
• Volvo Penta TAD540-42VE

• Engine Family: TAD
• HP Range: Approximately 160-250 HP
• Year Range: Approximately 2010 - 2021

⚙️ Key Features

• Genuine Volvo Penta high-pressure fuel rail
• Precision-machined injector-pipe ports
• Supports the specified rail-pressure sensor and relief valve
• Designed for common-rail diesel injection pressure
• Engine-calibration-specific fuel volume and port arrangement
• Engine type: 5.1L inline four-cylinder turbocharged industrial diesel

🔌 Function

Stores and distributes high-pressure diesel fuel evenly to the injectors while allowing the control unit to monitor and regulate rail pressure.

⚠️ Common Signs of Failure

• Hard starting or no start
• Rail-pressure fault codes
• Fuel leakage around a port or fitting
• Unstable idle or reduced power
• Internal contamination or damage after high-pressure pump failure

🛠️ Service Notes

• This is high-pressure fuel equipment: let the system depressurise before opening any union, and never crack a union with the engine running
• Cleanliness is everything — cap or plug every open port immediately, work in a clean area, and keep rag, brushes and workshop air away from anything that could leave fibres or grit in the rail
• High-pressure pipes are single-use: the pipe cone deforms to its seat when first tightened, so fit new pipes whenever they have been undone rather than refitting the originals
• Do not clamp the rail in a vice, dress a union seat or try to clean the rail internally — a damaged sealing cone or debris left inside will take out injectors
• Tighten unions and mountings to the workshop manual figures for your engine, since over-tightening damages the very seat the seal depends on, then prime, vent and leak-check at idle before putting it under load

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 21785960 - injectors
• 22236215 - injectors
• 993664 - injector O-ring
• 21228824 - injector gasket
• 21453372 - injector screw
• 21786627 - injector yoke
• 21859185 - injector insert sleeve
• 21888175 - high-pressure fuel pipes
• 21888177 - high-pressure fuel pipes
• 21888179 - high-pressure fuel pipes
• 21888181 - high-pressure fuel pipes
• 22031626 - rail-pressure sensor

OEM Reman Alternatives

• 3801627 - genuine remanufactured injectors
• 3801661 - genuine remanufactured injectors

📦 Condition

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