Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBMW2023M340IREPAIR AND DIAGNOSISENGINE MECHANICALMECHANICALENGINE - CYLINDER HEAD/VALVE COVER (2 OF 2) - REPAIR (G20)
2023 BMW M340i
Engine - Cylinder Head/Valve Cover (2 Of 2) - Repair (G20)
2023 BMW M340iSECTION Engine - Cylinder Head/Valve Cover (2 Of 2) - Repair (G20)
- 11 12 Cylinder Head With Lid
- 11 12 070 Remove and install/replace acoustic cover (M340i and M340i xDrive)
- 11 12 100 Removing and installing cylinder head (M340i)
- 11 12 100 Removing and installing cylinder head (M340i 48V)
- 11 12 101 Replace cylinder head gasket (M340i)
- 11 12 101 Replace cylinder head gasket (M340i 48V)
- 11 12 161 Replace cylinder head (M340i)
- Removing the cylinder head
- Removing the exhaust turbocharger (cylinder head removed)
- Removing the cylinder head gasket
- Seal the oil duct
- Clean sealing surfaces
- Installing the cylinder head gasket
- Replacing the cylinder head (remounting components)
- Installing the exhaust turbocharger (cylinder head removed)
- Installing the cylinder head
- 11 12 161 Replace cylinder head (M340i 48V)
- Removing the cylinder head
- Removing the exhaust turbocharger (cylinder head removed)
- Removing the cylinder head gasket
- Seal the oil duct
- Clean sealing surfaces
- Installing the cylinder head gasket
- Replacing the cylinder head (remounting components)
- Installing the exhaust turbocharger (cylinder head removed)
- Installing the cylinder head
- 11 12 502 Disassemble and assemble cylinder head (cylinder head removed) (without removal of valves) (M340i and M340i xDrive)
- Removing the exhaust turbocharger (cylinder head removed)
- Mounting the cylinder head on the assembly jig
- Adjusting the eccentric shaft to the minimum lift (cylinder head removed)
- Removing the torsion springs (cylinder head removed)
- Removing all gates
- Removing all intermediate levers
- Removing the intake camshaft (cylinder head removed)
- Remove the servomotor for the eccentric shaft (cylinder head removed)
- Removing the eccentric shaft (cylinder head removed)
- Removing the exhaust camshaft (cylinder head removed)
- Remove all roller cam followers
- Removing all hydraulic valve clearance compensating elements
- Remove all valve springs
- Remove valve stem seals
- Remove all valves
- Install all valves
- Installing valve stem seals
- Install all valve springs
- Installing all hydraulic valve clearance compensating elements
- Install all roller cam followers
- Install exhaust camshaft (cylinder head removed)
- Installing the eccentric shaft (cylinder head removed)
- Installing the servomotor for the eccentric shaft (cylinder head removed)
- Installing the intake camshaft (cylinder head removed)
- Checking the intermediate lever classification
- Installing all intermediate levers
- Installing all gates
- Checking the position of the intake camshaft (cylinder head removed)
- Install the torsion springs (cylinder head removed)
- Removing the cylinder head from the assembly jig
- Installing the exhaust turbocharger (cylinder head removed)
- 11 12 670 Clean intake ports (after vehicle diagnosis) (M340i)
- 11 12 670 Clean intake ports (after vehicle diagnosis) (M340i 48V)
- 11 12 729 Checking cylinder head for watertightness (Cylinder head disassembled) (M340i and M340i xDrive)
- 11 12 100 Removing and installing cylinder head (M340i xDrive)
- 11 12 100 Removing and installing cylinder head (M340i xDrive 48V)
- 11 12 101 Replace cylinder head gasket (M340i xDrive)
- 11 12 101 Replace cylinder head gasket (M340i xDrive 48V)
- 11 12 161 Replace cylinder head (M340i xDrive)
- Removing the cylinder head
- Removing the exhaust turbocharger (cylinder head removed)
- Removing the cylinder head gasket
- Seal the oil duct
- Clean sealing surfaces
- Installing the cylinder head gasket
- Replacing the cylinder head (remounting components)
- Installing the exhaust turbocharger (cylinder head removed)
- Installing the cylinder head
- 11 12 161 Replace cylinder head (M340i xDrive 48V)
- Removing the cylinder head
- Removing the exhaust turbocharger (cylinder head removed)
- Removing the cylinder head gasket
- Seal the oil duct
- Clean sealing surfaces
- Installing the cylinder head gasket
- Replacing the cylinder head (remounting components)
- Installing the exhaust turbocharger (cylinder head removed)
- Installing the cylinder head
- 11 12 670 Clean intake ports (after vehicle diagnosis) (M340i xDrive)
- 11 12 670 Clean intake ports (after vehicle diagnosis) (M340i xDrive 48V)
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.