Checking and converting adapter for back pressure test on natural gas tank, engine code CDGA — VW

🧭 Before you start

Fits: VW Touran I (1T, 2003–2015)

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• When doing so, counterhold on union (2) with suitable tool.
• Counterhold using a suitable tool while doing so.

🔧 Engine codes this applies to

🔩 Torque settings

Values can differ between engine variants — check the code stamped on your block.

ℹ️ Always cross-check the exact figure against your vehicle's factory manual before final tightening — a wrong torque can damage the engine. These values are extracted from workshop data and may not cover every variant or revision.

📐 41 workshop diagrams for CDGA

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

📋 Procedure

1. ⚠ Before using the adapter for back pressure test on natural gas tank, always check if it is the latest version. Older versions of the adapter for back pressure test on natural gas tank must not be used unless converted accordingly. The only adapter that may be used is the adapter V.A.G 1274B/12 A. All other adapters need to be converted accordingly. Adapters with pressure relief valve need to be retrofitted .Distinguishing between different versions .Converting adapter for back pressure test on natural gas tank. — Observe safety precautions (see the separate procedure).
2. Observe rules for cleanliness (see the separate procedure).
3. Observe safety precautions when working on natural gas system (see the separate procedure).
4. Carefully loosen and unscrew union nut (2).
5. When doing so, counterhold on union (2) with suitable tool.

6. Remove spacer ring from union (1).
7. Insert filter strainer (2) into adapter (1).
8. Insert the supplied seal (3) into adapter (1).
9. Fit spacer ring (4) onto threaded piece of adapter (5).
10. Screw adapter V.A.G 1274B/12 A-1(15) onto adapter (5), and tighten to 20 Nm. — 20 Nm (15 lb-ft)
11. Counterhold using a suitable tool while doing so.
12. Connect converted adapter for back pressure test on natural gas tank to fuel tank shut-off valve, and perform leakage test (see the separate procedure).

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