Installing sump (top section) - engines with moulded gasket — AUDI
Installing sump (top section) - engines with moulded gasket on Audi: 20 steps, 4 torque figures, engines AFB, AKE, AKN, AYM.
Installing the upper sump section on engines with a moulded gasket, under platform code 4B, covering engines such as AFB, AKE, AKN, AYM, BAU and BDG. The sealing faces are cleaned, a moulded gasket is used again if one came off, and the dipstick guide tube gets a new O-ring and is fed into its hole as the sump goes up. All bolts to the cylinder block go in at 5 Nm in diagonal sequence, then the sump-to-gearbox bolts are tightened to 45 Nm, and only after that are the block bolts brought up to final torque diagonally. The rest is a long rebuild of the front end: oil pump, bottom sump section, subframe, anti-roll bar, gearbox mountings, starter, alternator, compressor, belt, lock carrier and bumper.
🧭 Before you start
Clean the faces, fit a new dipstick tube O-ring and position the upper sump with its moulded gasket. Snug the block bolts to 5 Nm diagonally, tighten the gearbox bolts to 45 Nm, then final-tighten the block bolts diagonally. Refit oil pump, lower sump, subframe, anti-roll bar, mountings, starter, alternator, compressor and belt, then fill oil and coolant and rebuild the front end.
Fits: Audi A6 C5 (4B)
- Opens: coolant
- Renewed: o-ring to dipstick guide tube
Don't miss
- Reuse a moulded gasket if the sump top section originally had one; do not swap to sealant.
- Fit a new O-ring to the dipstick guide tube and locate the tube as the sump goes up.
- Block bolts to 5 Nm first, gearbox bolts to 45 Nm, then final-tighten the block bolts diagonally.
- Fill both engine oil and coolant before the first start.
Written for this job from the workshop steps below · TorqFix editorial.
🔩 Torque settings
Values can differ between engine variants — check the code stamped on your block.
| Torque | Fastener / step |
|---|---|
| 28 Nm (21 lb-ft) | Allow stop for torque reaction support to rest on rubber buffer for torque reaction… |
| 45 Nm (33 lb-ft) | Tighten bolts securing sump (top section) to gearbox |
| 5 Nm (3.7 lb-ft) | Fit sump (top section) and tighten all bolts securing sump (top section) to cylinder… |
| 55 Nm (41 lb-ft) | Allow stop for torque reaction support to rest on rubber buffer for torque reaction… |
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.
📋 Procedure
- ⚠ It is essential to use a moulded gasket again if sump (top section) was previously fitted with such a gasket. — Clean sealing surfaces before installing sump (top section).
- Fit new O-ring to dipstick guide tube.
- When positioning sump (top section), insert dipstick guide tube in hole.
- Fit sump (top section) and tighten all bolts securing sump (top section) to cylinder block initially to 5 Nm in diagonal sequence. — 5 Nm (3.7 lb-ft)
- Tighten bolts securing sump (top section) to gearbox to 45 Nm. — 45 Nm (33 lb-ft)
- Tighten bolts securing sump (top section) to cylinder block diagonally:
- Install oil pump .
- Install sump (bottom section) .
- Install subframe Running gear, front-wheel drive and four-wheel drive40.
- Install anti-roll bar Running gear, front-wheel drive and four-wheel drive40.
- Install gearbox mountings 34 or 37.
- Install starter Electrical system27.
- Install alternator Electrical system27
- Install air conditioner compressor Air conditioning system87.
- Install poly V-belt .
- Fill up with engine oil and check oil level .
- Install lock carrier General body repairs, exterior50.
- Install front bumper General body repairs, exterior63.
- Fill cooling system .
- Observe notes on procedures required after connecting battery Electrical system27.
Other AUDI procedures
- Removing and installing fuel gauge sender 3 G237
- Adjusting accelerator position sender G79 - vehicles with 4-cylinder engine
- Connecting vehicle diagnosis and service information system VAS 5052 and selecting engine electronics control unit
- Repairing injection pump
- Testing fuel pump relay -J17 and activation - Vehicles with 4-cylinder engine
- Removing and installing toothed belt – Audi · 56 torque figures
- Removing engine – Audi A8 D3 · 41 torque figures
- Removing camshaft timing chain from camshafts – Audi A6/A7 C7 · 38 torque figures
- Installing engine – Audi A8 D4 · 36 torque figures
- Removing and installing camshaft timing chain · 29 torque figures
Who makes these pages, and how
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.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.