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Autopapyrus · Volkswagen Touran 2.0 TDI BKD 140 (2008)
https://autopapyrus.com/guides/volkswagen/touran/unit-injector-replacement/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

Volkswagen Touran 2.0 TDI BKD 140 (2008): Unit Injector Replacement

The BKD engine uses a Pumpe-Düse unit injector system, in which each injector combines a high-pressure pump section and a nozzle. Replacement is needed when the plunger pair is worn, the spray pattern is poor, or the solenoid valve fails. The procedure is labor-intensive: it involves removing the valve cover and the rocker arm shaft, then pulling the injectors out of their bores using a slide hammer or a special tool. The seal rings under the injectors should be replaced every 80-100 thousand km, while full injector replacement is only needed when they are worn or faulty.

Difficulty: Hard Time: 6-8 hours Steps: 12 Tools: torque wrench (0-30 N·m (0-22 lb-ft)), Torx bit set, injector puller (slide hammer with hooks or a dedicated injector extractor), plastic scraper for cleaning, caustic soda solution, micrometer (if needle adjustment is required)

Parts

3
  • 🔩 Bosch unit injector 03G130073G (VW OE) or 0414720404 (Bosch)
  • 🔩 Bosch seal ring repair kit 1417010996
  • 🔩 new injector hold-down bolts (4 pcs)
There's a full repair manual for this car Every system, wiring diagrams and torque specs — not just this job. Haynes and 3 more. See manuals →

Step by step

12 steps
  1. Preparation - Disconnect the negative battery terminal, remove the air filter housing assembly and the corrugated air duct, then disconnect the connectors from the unit injectors (press the latch and turn the connector counterclockwise until it releases) and from the glow plugs.
  2. Valve cover removal - Remove the 11 valve cover bolts, move the aluminum fuel lines aside (10 mm bolts), remove the line bracket, and disconnect the crankcase ventilation hose.
  3. Rocker arm shaft removal - The wiring harness channel is removed together with its spring retainers, which gives access to the unit injector hold-down bolts.
  4. Injector removal - Remove the hold-down bolt from each injector (torque 20 N·m (15 lb-ft) + 90° on installation; the bolts are single-use, so always replace them), then pull the injectors out of their bores using a slide hammer with hooks (42 mm spacing between hooks, hook length at least 100 mm) or a dedicated extractor. Note: the injectors are coked and stuck tight, so removing all 4 takes 2-3 hours.
  5. Cleaning the seats - Remove carbon deposits from the cylinder head bores with a plastic scraper or a brass brush, wipe with a clean rag, and check for corrosion. If necessary, restore the seating surfaces.
  6. Cleaning the old injectors (if you plan to reinstall them) - Clean them mechanically with a plastic scraper, then soak them in caustic soda solution (2-4 cycles of 30-60 minutes), and rinse with diesel fuel or a special solvent.
  7. Installing the repair kit - Replace the seal rings on each injector (Bosch kit 1417010996 or equivalent) and lubricate the rings with clean engine oil.
  8. Needle clearance adjustment (if you have the equipment) - Screw in the adjusting screw until it stops firmly, then back it off by 180° (half a turn) and lock it with the locknut at 30 N·m (22 lb-ft). Adjustment is not possible without a test bench, so install the injectors with their factory settings.
  9. Installing the injectors - Install the injectors perfectly vertically in the center of the bore without tilting, and start the new hold-down bolts by hand. Tightening torque: 3 N·m (2 lb-ft) (initial tightening) + 90° (quarter turn) + 180° (half turn). A torque wrench is mandatory.
  10. Reassembly in reverse order - Install the rocker arm shaft, the valve cover (bolt torque 10-12 N·m (7-9 lb-ft)), the fuel lines, and the wiring harness channel, then reconnect the connectors (turn clockwise until they click).
  11. Camshaft synchronization (if the shaft was removed) - Set the camshafts to the 0° position using VAG-COM diagnostic equipment or an equivalent, and adjust only the intake camshaft gear; the exhaust camshaft stays fixed.
  12. Adaptation and check - Connect a diagnostic scan tool and perform injector adaptation (the injection correction codes are entered from the marking on the injector body, a 6-digit IMA code), start the engine, check for fuel leaks, and evaluate the cylinder correction values (±0.4 mg/stroke is excellent, ±1.5 mg/stroke is acceptable).

Common mistakes and warnings

  • The injector hold-down bolts are single-use. Reusing them causes loss of combustion chamber sealing and blow-by of gases. Under-tightening the bolts (less than 3 N·m (2 lb-ft)) causes pressure leakage and injector failure, and over-tightening cracks the unit injector body. Working with unit injectors requires strict adherence to the tightening torques with a torque wrench, and it must not be done without one. Without adapting the correction (IMA) codes, the engine will run roughly, and black smoke and increased fuel consumption are possible. If you have no experience with the Pumpe-Düse system and VAG diagnostic equipment, contact a repair shop that specializes in VW diesel engines.