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.
11 21 531 Replacing all crankshaft main bearing shells (N20, N26)
Special tools required:
Necessary preliminary tasks:
- Remove CRANKSHAFT .
Checking position of oil spray nozzles:
Check position of oil spray nozzle according to position on special tool 2 212 829 .
Insert special tool 2 212 829 into main bearing screw connection and secure from turning with screw (1).
Secure oil spray nozzle with screw (2).
Tightening torque: 11 11 3AZ .
Installation note:
Bearing shell (1) with lubricating groove must be fitted in upper section of crankcase.
Bearing shell (2) without lubricating groove must be installed in lower section of crankcase.
Bearing position 1 is at the front on the timing chain drive in the direction of travel.
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.