Wednesday 26 May 2021

BMW M40 Engine - how to check timing, where the marks are located

This must be one of the hardest bits of info to find in the whole world of BMW, but there is a great post on BMW Werks on how to do it [].


** Only if crank pulley has NOT been separated from crankshaft! **

1. Remove the distributor / timing cover at the front of the engine.

2. Check the timing mark on the crank pulley. This is an arrow cast into the block which should line up with the sprocket tooth to the right of the gap in the teeth, as in pic below.

3. Check the timing mark on the camshaft pulley. This is a notch/line mark in the pulley and should line up with the right-angle notch in the cylinder head, as in pic below. If this looks good, your timing is fine.

Thanks again to xdrian on BMW Works for making these pics and sharing this secret!


  1. No... i do not think that is the correct way..timing mark on the crank pulley should line up with the arrow..Engine will run but it wont be at correct timing..there is also a crank locking hole just below the starter for that reason

    1. Is that definitely M40 and not M42??

    2. Also, it worked for me, him and others... I cannot find the crank locking hole you speak of. Hopefully someone else can clarify...