- An assistant to remove / install the spring on the cylinder head of camshaft.
- Before remove the spring, fixed A1156-12 in the positioned plate and loosen the bolt.
- Open A1156-12 carefully, unloaded the spring and take it off.
- Close A1156-12 to tighten the spring while installing it.
- To match the bolt to hole, and locked.
- Applicable: BMW N42 / N46