20502189 Injector | Genuine Volvo Penta Part

🔧 Product Description

Complete mechanical injector/nozzle-holder assembly for D5A/D7A and selected TAD721VE/TAD722VE engines, with Volvo Penta exchange injector 3803948 and nozzle 20524235 as related service references. Complete Bosch mechanical injector/nozzle-holder assembly for the Deutz-derived Volvo Penta D5/D7, TD520/TAD520 and TD720/TAD720/TAD721/TAD722 engine families. Volvo Penta exchange injector 3803948 and nozzle 20524235 are the principal service references.

🚤 Compatibility

• Engine Family: D, TD, TAD
• HP Range: Approximately 300 HP
• Year Range: Approximately late 1990s-2000s

Full model list at the end of this description.

⚙️ Key Features

• Complete mechanical nozzle-and-holder assembly
• Calibrated opening pressure and spray pattern for the specified engine family
• Supports clean combustion, cylinder balance and rated power
• Compatible with the original fuel pipe, hold-down and sealing arrangement
• Professional pressure testing is recommended before installation or after overhaul
• Engine type: Four- and six-cylinder mechanically injected turbocharged diesel
• Quantity varies by assembly, most commonly four

🔌 Function

Opens at the calibrated fuel pressure and atomises diesel into the combustion chamber for controlled ignition and complete combustion.

⚠️ Common Signs of Failure

• Rough idle, misfire or cylinder imbalance
• Injector knock, dribble, incorrect opening pressure or poor spray pattern during testing

🛠️ 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clean: cap the fuel connections as they come off and clear the muck out of the injector recess before the injector is withdrawn, so nothing drops into the cylinder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 Supersession Chain

• 20502189 → Supersedes 20498444

OEM / Related Numbers

• 20498444 earlier number superseded by this part
• 20524235 injector nozzle
• 11700426 injector sealing washer
• 11700424 injector retainers
• 20405559 retaining screw
• 20405847 delivery valve
• 20581916 nipple used in EDC configurations
• 20459906 nipple used in applicable alternative configurations
• 20450673 spacer bolt
• 20513340 fuel-temperature sensor in applicable EDC layouts
• 20405886 rubber seal
• 20515652 plug

Other-Brand OEM Numbers

• Bosch: 0432191327
• Bosch: 0432191328

OEM Reman Alternatives

• 3803948 Volvo Penta exchange injector

Aftermarket / Verified Equivalents

• Aftermarket complete injectors are commonly referenced by 20502189 / 3803948; replace matched sets where fuel delivery differs from the existing injectors

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D7A-B TA, D7C-B TA
• Volvo Penta TAD520GE, TAD520VE
• Volvo Penta TAD530GE MECH, TAD530GE EDC4
• Volvo Penta TAD531GE MECH, TAD531GE EDC4
• Volvo Penta TAD720GE, TAD720VE
• Volvo Penta TAD721GE, TAD721VE
• Volvo Penta TAD722GE, TAD722VE
• Volvo Penta TAD730GE MECH, TAD730GE EDC4
• Volvo Penta TAD731GE MECH, TAD731GE EDC4
• Volvo Penta D5A-B TA
• Volvo Penta TAD532GE EDC4
• Volvo Penta TAD732GE EDC4
• Volvo Penta TAD733GE EDC4
• Volvo Penta TD720VE PP