20550303 Injector | Genuine Volvo Penta Part

🔧 Product Description

This genuine Volvo Penta injector is an OEM service component used in the Mechanical Diesel Fuel Injector. It is manufactured to the original Volvo Penta dimensional, material and interface requirements for the documented Volvo Penta TD/TAD5-7 diesel application. Technical identification: Mechanical diesel injector/nozzle-holder assembly; Volvo exchange/remanufactured service reference 3803953. In service, it meters and atomises diesel fuel into the combustion chamber at the specified timing, opening pressure and spray pattern. Selection must be confirmed by OEM part number 20550303, the exact model/product number, serial number and installed assembly configuration.

🚤 Compatibility

Typically suits:

• Volvo Penta TD720GE
• Volvo Penta TD720VE PP
• Volvo Penta TD520GE
• Volvo Penta TD520VE

• Engine Family: TD

⚙️ Key Features

• Genuine Volvo Penta OEM injector
• OEM part number 20550303
• Technical distinction: Mechanical diesel injector/nozzle-holder assembly; Volvo exchange/remanufactured service reference 3803953
• Maintain absolute fuel-system cleanliness, renew the specified sealing washer/O-rings, use the approved torque and verify leakage, return flow and cylinder balance.
• Quantity varies by assembly, most commonly four

🔌 Function

Meters and atomises diesel fuel into the combustion chamber at the specified timing, opening pressure and spray pattern. 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 clean: cap the fuel connections as they come off and clear the muck out of the injector recess before the injector is withdrawn, so nothing drops into the cylinder
• Clean the carbon off the seat in the head and out of the bore — a chip of carbon under an injector holds it off its seat and lets combustion gas past
• Renew the sealing washer, seal ring and O-rings supplied with the injector rather than reusing the old ones, and fit only the type of seal your engine's seat design uses
• Pull the clamp or holder down evenly to the torque given in the workshop manual for your engine; an over-tightened injector distorts and a slack one blows by
• Where the engine has electronically controlled injectors, the new injector's calibration code must be programmed into the control unit with Volvo Penta diagnostic equipment, then bleed the fuel system and leak-check before the boat goes back into service

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 20508553 injector nozzle
• 11700426 injector sealing washer
• 11700424 injector retainer

OEM Reman Alternatives

• 3803953 (Volvo exchange/remanufactured injector)

Aftermarket / Verified Equivalents

• SLP: INJ-303

📦 Condition

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