BMW M135i/xDrive (N55) Torque Specifications
Back to 1 Series (F20/F21)Engine code: N55 B30A
Power: 235 kW (320hp) @ 5800 rpm
Production years: 2012-2015
Cylinder Head
Renew bolts: Yes
Do not remove bolt coating.
Lightly coat contact surfaces between bolt head, washer and cylinder head (use oil).
Use new bolts.
Bolts 1-10 = M11 x 173
Bolts 11-14 = M9 x 170
Tighten bolts in the following stages:
- 30 Nm
- 90°
- 180°
Timing chain housing bolts:
Bolts 15-18 (M9 x 30/70) = 22 Nm
Engine Torque Specs
| Component | Torque |
|---|---|
| Main bearings | Renew bolts/nuts: Yes Bedplate to engine block - tighten bolts in the following stages: 1-14 (M10 x 100) = 20 Nm + 70° 15-35 (M10 x 27) = 15 Nm + 90° 36 (M10 x 41) = 15 Nm + 90° M8 x 37 = 8 Nm + 90° fig 1 Oil baffle plate: Use new bolts. M6 x 20 = 4 Nm + 90° Insert new injection nozzles for sealant application (BMW part No.11 117 506 546) fully into the left and right holes in the bedplate/cylinder block joints using BMW tool No.11 9 360 or equivalent. Install new front and rear crankshaft seals. Blow compressed air (6 bar max.) into left and right injection nozzles. Check that air escapes from the openings on each side of the crankshaft seals. If no air escapes, disassemble bedplate and cylinder block and clean all mating surfaces. Reassemble components and repeat process. Inject Loctite 193140 sealant into left and right injection nozzles using BMW tool No.11 4 370 or equivalent until it flows out of injection nozzles and openings at front and rear crankshaft seals fig 2 and fig 3. Remove excess sealant and apply Loctite 17100 hardener where the sealant escaped at the injection nozzles and the crankshaft seals. Oil pump chain guide bolt fig 4: Use new bolt. 4 Nm + 45° Cover for oil pump chain guide bolt: Use new seal. 27 Nm  |
| Big end bearings | Renew bolts/nuts: Yes Use new bolts. Clean and lubricate bolts. Stage 1: 20 Nm + 70° Stage 2: 70° |
| Oil pump to cylinder block | Use new bolts. M8 x 123 = 10 Nm + 180° M8 x 31/37 = 10 Nm + 90° |
| Sump bolts | Use new nuts/bolts. M8 x 26/36/50 = 8 Nm + 90° M8 x 92/112 = 8 Nm + 180° |
| Sump drain bolt | 25 Nm |
| Flywheel/driveplate | 60 Nm + 45° (Use new bolts) |
| Clutch pressure plate | 15 Nm + 90° (Use new bolts) |
| Crankshaft pulley/damper centre bolt | Use new bolt. Oil threads and mating surface of bolt. 100 Nm 270° |
| Crankshaft pulley/damper bolts | 35 Nm |
| Camshaft sprocket/gear | 20 Nm + 180° (Use new bolts) |
| Camshaft carrier/cap | Do NOT lubricate bolts. Exhaust = 8 Nm + 60° Inlet = 9 Nm |
| Camshaft/rocker cover | Tighten bolts in sequence: Bolts 1-2 = 8,5 Nm Bolts 3-24 = 9 Nm Bolts 1-2 = 9 Nm  |
| Inlet manifold to cylinder head | 15 Nm |
| Exhaust manifold to cylinder head | Tighten bolts in the following stages: 8 Nm 13 Nm  |
| Exhaust downpipe to manifold | 13 Nm (Use new clamp) |
| Water pump | 10 Nm + 90° (Use new bolts) |
| Spark plugs | M12=23±3 Nm M14=30±3 |
| Crankshaft position (CKP) sensor/engine speed (RPM) sensor | 5 Nm |
| Camshaft position (CMP) sensor | 8 Nm |
| Engine coolant temperature (ECT) sensor | 18 Nm |
| Lambda sensor (Oxygen) | 50 Nm Coat threads with high temperature lubricant (BMW part No. 83-23-2-158-852). High temperature lubricant must not enter slots on lambda sensor. |
| Knock sensor (KS) | 22 Nm |
| Engine oil pressure switch | 20 Nm + 16° |
| Oil filter | 25 Nm |
Chassis Tightening Torques
| Component | Torque |
|---|---|
| Front hub | 4x4=210 Nm + 90° (Use new bolt) |
| Front hub - wheel bearing housing bolts | 80 Nm + 90° (Use new bolts) |
| Rear hub | 145 Nm + 45° (Use new bolts) |
| Steering wheel | 62 Nm (Use new bolt) |
| Steering rack/box mounting | 56 Nm + 90° 4x4=56 Nm (Use new nuts/bolts) |
| Steering track rod end | 175 Nm (Use new nuts) |
| Brake disc to hub (Front) | 16 Nm (Use new bolts) |
| Brake caliper to carrier (Front) | 28 Nm |
| Brake caliper/carrier to hub (Front) | 110 Nm (Use new bolts) |
| Brake disc to hub (Rear) | 16 Nm (Use new bolts) |
| Brake caliper to carrier (Rear) | 28 Nm |
| Brake caliper/carrier to hub (Rear) | 50 Nm + 60° (Use new bolts) |
| Back plate to hub (Rear) | 12 Nm M8=15 Nm (Use new bolts) |
| ABS sensor (Front) | 8 Nm |
| ABS sensor (Rear) | 8 Nm |
| Road wheels | 140 Nm Lightly coat mating surfaces between wheel centre hole and hub (use grease). Do NOT lubricate bolts. |
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