AMU engine — Audi 1.8 (1.8L)
1.8L · 221 hp
Engine overview
Torque figures by job
From the step-by-step procedures for this engine — each figure sits in the step that uses it.
- 20 Nm (15 lb-ft) — Attach engine bracket T10012 with nut and bolt to cylinder block: approx
- 3 Nm (2.2 lb-ft) — Initially tighten bolts (A) to
- 35 Nm (26 lb-ft) — Tighten bolts (B) and (C) to
- 45 Nm (33 lb-ft) — Tighten bolts (A) to
- 35 Nm (26 lb-ft) — Tighten bolts (B) to
- 22 Nm (16 lb-ft) — Tighten bolt (C) to
- 40 Nm (30 lb-ft) — Tighten with torque wrench to
- 5 Nm (3.7 lb-ft) — Pre-tighten bolts (1
- 40 Nm (30 lb-ft) — Tighten bolts for sump/gearbox (arrows) to
- 15 Nm (11 lb-ft) — Tighten bolts (1
- 40 Nm (30 lb-ft) — Tighten clamp evenly to
- 40 Nm (30 lb-ft) — Tighten bolts on front clamp evenly to
- 40 Nm (30 lb-ft) — Tighten bolts on rear clamp evenly to
- 30 Nm (22 lb-ft) — Fit conrod bearing cap and tighten to
Factory specifications
Values from the manufacturer documentation for this engine.
Engine (general)
| Engine code | AMU |
| Capacity | 1781 cc |
| Normal | 10.0 - 13.0 bar |
| Minimum | 7.0 bar |
| Differential limit between cylinders | < 3.0 bar |
| Oil pressure | > 1.3 bar/rpm |
| Oil pressure | 3.5-4.5 / 3500 bar/rpm |
Engine (petrol)
| Fuel system (make and type) | Bosch Motronic ME 7.5 |
| Number of cylinders | 4 |
| Firing order | 1-4-3-2 |
| Injector resistance | 12 - 13 ohms |
| Spark plugs (make and type) | VW/Audi 101 000 63 AA NGK PFR6Q |
| Spark plug gap | 0.8 mm |
| Injection pressure/system pressure | 2.5 3.0 bar |
| CO exhaust gas | < 0.5 % |
| Lambda | 0.97 - 1.03 |
| Lambda change (Delta Lambda) | 0.03 |
| Oil temperature during test | 80 °C |
| CO at fast-idle speed | < 0.3 % |
Cooling system
| Cap pressure | 1.4 - 1.6 bar |
| Thermostat opens at | 87 - 102 °C |
| Stage 1/Fan 1 | 92 - 97 °C |
| Stage 2/Fan 2 | 99 - 105 °C |
Electrical
| Battery | 62 Ah |
| Alternator | 90 / 120 A |
Capacities
| Engine sump, incl. filter | 4.5 l |
| Manual transmission | 02J 02M |
| Gearbox refill | 02J: 2.0 02M: 2.6 l |
| Differential, 4WD rear | 1.0 l |
| Haldex coupling | 0.25 l |
| Cooling system | 5.0 l |
| Air-conditioner refrigerant | 775 ± 25 g |
| Air-conditioner compressor oil | 135 ± 15 ml |
Torque settings
| Cylinder head bolts — Stage 1 | 40 Nm |
| Cylinder head bolts — Stage 2 | 90 ° |
| Cylinder head bolts — Stage 3 | 90 ° |
| Spark plugs | 30 Nm |
| Oil plug | 30 Nm |
| Main bearing cap | 65 Nm + 90° Nm |
| Big-end bearing cap | 30 Nm + 90° Nm |
| Wheel bolts | 120 Nm |
| Front hub | 265 Nm |
| Front hub | 190 Nm + 90° |
| Front hub | 240 Nm + 90° |
| Rear hub | 220 Nm |
Emissions
| Emission code | 70/220*1996/69 |
| Emission standard | Euro 2 (12/1998 ->) |
| CO2 average | 226 - 228 g/km |
| CO | 0.628 g/km |
| HC NOx | 0.144 g/km |
| Emission code | 70/220*1999/102A |
| Emission standard | Euro 3 (07/2000 ->) |
| CO | 1.331 g/km |
| HC | 0.115 g/km |
| NOx | 0.076 g/km |
| CO2 average | 221 - 223 g/km |
| CO2 average | 226 g/km |
Engine codes in the same family
The same code prefix usually means the same block with a different output, fuel or model year. Procedures are often shared — check the code on the engine plate.
Workshop procedures for this engine
Step-by-step procedures from the workshop database, carrying 297 torque figures.
- Removing and installing toothed belt – Audi · 56 torque figures
- Removing engine – Audi A8 D3 · 41 torque figures
- Installing engine – Audi A8 D4 · 36 torque figures
- Removing and installing cylinder head – Audi A2 · 24 torque figures
- Stress-free alignment of exhaust system · 54 torque figures
- Removing and installing turbocharger – Audi A8 D4 · 10 torque figures
- Removing and installing sump – Audi · 10 torque figures
- Removing and installing poly V-belt – Audi A6 C5 · 11 torque figures
- Draining and filling cooling system – Audi Q7 · 6 torque figures
- Separating engine and gearbox · 7 torque figures
- Removing and installing coolant pump – Audi A1 · 6 torque figures
- Measuring radial clearance of conrods – Audi A3 · 8 torque figures
- Checking compression – Audi A6 C5 · 5 torque figures
- Removing and installing oil pump – Audi A8 D3 · 5 torque figures
- Adjusting assembly mountings – Audi A3 1.8 · 4 torque figures
- Removing and installing sealing flange (front) – Audi A6 C5 · 1 torque figures
- Removing and installing thermostat – Audi A4 B5 · 2 torque figures
- Removing and installing vibration damper – Audi Q3 · 3 torque figures
- Removing and installing bracket for ancillaries – Audi A3 · 2 torque figures
- Removing and installing cylinder head cover – Audi TT Mk1
- Removing and installing exhaust manifold – Audi TT Mk1
- Removing and installing intake manifold – Audi TT Mk1
- Removing and installing fuel tank with attached components
- Removing and installing radiator – Audi Q7 · 1 torque figures
- Separating centre and rear silencers · 5 torque figures
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TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
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The story behind TorqFix →Workshop data on this page last updated 22 Aug 2026.