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 MANUALSBMW2011Z4 30I, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCEENGINE CONTROL SYSTEMSENGINE - REPAIR (N52)1121 CRANKSHAFT WITH BEARING11 21 500 REPLACING CRANKSHAFT (N52K)
2011 BMW Z4 30i, Automatic
11 21 500 Replacing crankshaft (N52K)
2011 BMW Z4 30i, AutomaticSECTION 11 21 500 Replacing crankshaft (N52K)
IMPORTANT:
Aluminium-magnesium materials.
No steel screws/bolts may be used due to the threat of electrochemical corrosion.
A magnesium crankcase requires aluminum screws/bolts exclusively.
Aluminum screws/bolts must be replaced each time they are released .
Aluminum screws/bolts are permitted with and without color coding (blue).
For reliable identification:
Aluminum screws/bolts are not magnetic .
Jointing torque and angle of rotation must be observed without fail (risk of damage) .
No steel screws/bolts may be used due to the threat of electrochemical corrosion.
A magnesium crankcase requires aluminum screws/bolts exclusively.
Aluminum screws/bolts must be replaced each time they are released .
Aluminum screws/bolts are permitted with and without color coding (blue).
For reliable identification:
Aluminum screws/bolts are not magnetic .
Jointing torque and angle of rotation must be observed without fail (risk of damage) .
Necessary preliminary tasks:
- Remove ENGINE
- Mount engine on assembly stand
- Remove VIBRATION DAMPER
- Remove OIL SUMP
- Remove OIL PUMP
- Remove oil pump/vacuum pump CHAIN MODULE
- Remove timing CHAIN MODULE
- Remove CYLINDER HEAD
- Remove FLYWHEEL
- Removing all PISTONS
Release screws (1).
Tightening torque 11 13 6AZ .
Installation:
Replace aluminum screws.
Remove oil deflector (2).
NOTE:
Graphic shows the screw connection of the oil deflector (2) for vehicles with optional extra SA203 (all-wheel drive).
RENDER: 1.0x
NO RELATED
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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.