F00041N039 Diesel Common Rail Injector Overhaul Kit — High‑Pressure Seal & Return‑Line Repair Set

 

When a Bosch common rail injector returns more than 25 ml of fuel in a graduated cylinder test, the workshop diagnostic screen often lights up with P0087 (rail pressure too low) and the technician reaches for a replacement unit. Yet in over 80 % of cases, the real fault sits in the elastomer and metallic seals - not the solenoid or the nozzle needle. The F00041N039 Injector Repair Kit is purpose‑assembled to replace every wear‑critical sealing element that drives excess return flow, letting you restore injector hydraulic efficiency without swapping the coded injector body.

 

‣ Copper crush thrust ring – annealed to 45–55 HV, surface finish Ra ≤ 0.8 µm; conforms to micro‑irregularities on the nozzle seat under 1,800 bar load
‣ Nozzle‑retaining‑nut gasket – provides a secondary combustion‑gas barrier
‣ FKM body O‑ring trio – dimensions of Ø7.6×1.8 mm, Ø14.0×2.0 mm, Ø18.5×1.5 mm; formulated for continuous service in fuels containing up to B30 biodiesel
‣ Fuel return line seal ring – frequently overlooked, yet responsible for 15 % of external wet‑leak complaints
‣ Combustion seal washer – diamond‑shaped profile that embeds slightly into the cylinder head seat
‣ Adjustment shim set – thickness range 0.90 mm to 1.30 mm in 0.02 mm steps, enabling precise nozzle‑opening‑pressure (NOP) calibration

All elastomer parts carry a temperature window of −35 °C to +200 °C, preventing cold‑weather stiffening and heat‑cycling fatigue that causes internal diesel leakage.

 

0414701030

0414701032

0414701058

0414701059

These units are commonly installed on mid‑range diesel platforms managed by Bosch EDC16/EDC17 ECUs - Deutz TCD 2013/2015, Volvo D6 series, Iveco Cursor 8, and similar industrial powerpacks. One SKU covers all four injector part numbers, dramatically reducing shelf complexity for workshops that service mixed fleets. If your injector solenoid cap reads 0414701030, 0414701032, 0414701058, or 0414701059, the seal dimensions inside the F00041N039 kit match exactly.

 

Oil level creep: Combustion‑chamber‑side seal leakage forces diesel past the piston rings into the sump, raising oil volume by 1–2 litres between services and dropping oil viscosity below SAE 30 grade.

Hot‑start struggle: After a heat soak, the rail loses priming pressure through the leaky return circuit. Cranking time extends by 2–3 seconds before the engine fires.

Return‑flow surge: A standard 60‑second graduated‑cylinder test yields flows above 30 ml on a single injector - well past the OEM‑typical threshold of 25 ml.

ECU rail pressure deviation: The engine controller trims the pressure regulator to compensate, often creating a drift that eventually stores a P0087 or P1093 code.

Resealing with the F00041N039 repair kit eliminates the hydraulic short circuit at the source, bringing return volume back below 10 ml/min and stabilising the oil dilution curve.

 

Q1: My injector is a 0414701030. How do I confirm the F00041N039 kit fits?
Remove the solenoid connector and read the laser‑etched number on the cap. All four variants - 0414701030, 0414701032, 0414701058, 0414701059 - use identical seal cavities, so the kit fits without modification.

Q2: Will this kit fix a dripping nozzle tip?
No. The F00041N039 repair kit addresses high‑pressure‑circuit and return‑side sealing, not the nozzle needle‑seat interface. If the nozzle drips, the needle‑and‑guide assembly must be replaced separately.

Q3: Does the kit include the small return‑line connector O‑ring?
Yes. A dedicated 9.8 × 1.5 mm FKM seal for the return‑line banjo is inside the set, preventing the common external weep that many generic kits ignore.

Q4: After installing the seal kit, do I need to upload a new IMA code to the ECU?
If the original injector body is reused, the IMA code remains valid because the hydraulic flow characteristic of the solenoid and armature is unchanged. Re‑coding is only required when swapping the complete injector.

Q5: Can I reuse the copper thrust washer if it looks undamaged?
No. Copper crush washers work‑harden after the first installation. Reusing them risks an incomplete seal and a return‑flow comeback. Always fit the new washer from the kit.

Q6: Are the adjustment shims in the kit sufficient to bring NOP back to spec on a worn‑in injector?
The included shim range (0.90–1.30 mm) covers normal wear drift. If the required shim thickness falls outside this band, the nozzle spring may be fatigued and the injector body needs further assessment.

 

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