11 31 090 Removing and installing/replacing chain tensioner piston (B48B)
WARNING: This page is about a different car, the 2018 BMW 330i and 2017 BMW 330i. However, it is still accessible from the selected car via links, so may be relevant.
Necessary preliminary tasks:
- Remove CATALYTIC CONVERTER
Removal:
NOTE:
Tool to release the chain tensioner piston.
IMPORTANT:
Have a cleaning cloth ready. A small quantity of engine oil will emerge after the screw connection has been released.
Make sure no oil penetrates the clutch housing or comes into contact with the exhaust system.
Make sure no oil penetrates the clutch housing or comes into contact with the exhaust system.
Loosen the chain tensioner (1) from the bottom with the tool (2).
Remove the chain tensioner (1) towards the top.
Installation:
If the chain tensioner is reused, its oil chamber must be drained. Place chain tensioner on a level support and slowly compress.
Repeat process twice.
Parts: Replace sealing ring (1).
NOTE:
Tool to tighten the chain tensioner piston.
Install the chain tensioner (1) from the top.
Tighten the chain tensioner (1) from the bottom with the tool (2).
Tightening torque: 11 12 5AZ .
Required follow-up work:
- Install CATALYTIC CONVERTER