20508553 Nozzle | Genuine Volvo Penta Part

🔧 Product Description

This genuine Volvo Penta nozzle is an OEM service component used in the Injector Nozzle / Nozzle-Holder Service Component. It is manufactured to the original Volvo Penta dimensional, material and interface requirements for the documented Volvo Penta D5A/D7A/D7C and TD/TAD5-7 mechanical diesel fuel systems application. Technical identification: Precision injector nozzle used in the mechanical nozzle-holder assembly; opening pressure and spray pattern must be calibrated to the exact injection-system specification. In service, it meters and atomises diesel fuel through the injector/nozzle holder at the specified opening pressure and spray pattern for clean, balanced combustion. Selection must be confirmed by OEM part number 20508553, the exact model/product number, serial number and installed assembly configuration.

🚤 Compatibility

Typically suits:

• Volvo Penta D5A-T
• Volvo Penta D5A-TA
• Volvo Penta TD720GE
• Volvo Penta TD720VE PP
• Volvo Penta TD520GE
• Volvo Penta TD520VE
• Volvo Penta D7A-T
• Volvo Penta D7A-TA
• Volvo Penta D7C-TA
• Volvo Penta MD2010
• Volvo Penta MD2010B

• Engine Family: D, TD, MD

⚙️ Key Features

• Genuine Volvo Penta OEM nozzle
• OEM part number 20508553
• Technical distinction: Precision injector nozzle used in the mechanical nozzle-holder assembly; opening pressure and spray pattern must be calibrated to the exact injection-system specification
• Maintain absolute fuel-system cleanliness, renew the specified sealing washer/O-rings, use the approved torque and verify leakage, return flow and cylinder balance.

🔌 Function

Meters and atomises diesel fuel through the injector/nozzle holder at the specified opening pressure and spray pattern for clean, balanced combustion. Maintain absolute fuel-system cleanliness, renew the specified sealing washer/O-rings, use the approved torque and verify leakage, return flow and cylinder balance.

⚠️ Common Signs of Failure

• Hard starting, extended cranking or poor cold-start performance
• Uneven idle, cylinder misfire or excessive diesel knock
• Black, white or blue smoke caused by poor atomisation or leakage
• Reduced power, increased fuel consumption or high exhaust temperature
• External leakage, return-flow imbalance or carbon around the injector seat

🛠️ Service Notes

• Work scrupulously clean — a nozzle is a precision component with fine machined orifices, and grit carried in on a fingertip or a rag is enough to ruin it
• Never poke, ream or wire-brush the holes or the seat; if a nozzle is blocked or its spray pattern is disturbed, renew it
• Cap or plug the open fuel or oil way while the nozzle is out so nothing can drop into the passage
• Fit new sealing washers, seals or O-rings, clean the seat in the housing and check that seat is undamaged before the nozzle goes back
• Tighten to the figure and sequence given in the workshop manual for your engine; a nozzle pulled down unevenly or over-tightened will distort and leak

🔄 Supersession & Cross Reference

Aftermarket / Verified Equivalents

• SRP: N-08553

📦 Condition

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