X5D: Best way to clean carbon from block?

[bmwboyee]

I am currently in the process of deleting. I cleaned the plastic intake manifold but there seems to be some considerable build up on the runners from the block.

I currently own an N54 and N55 and understand the process of walnut blasting. it is the same for the M57? Is there a DIY? Is there another way to clean the runners? Seafoam?

Also, I did search but didn't see much.

[wcs531]

Originally Posted by bmwboyee

I am currently in the process of deleting. I cleaned the plastic intake manifold but there seems to be some considerable build up on the runners from the block.

I currently own an N54 and N55 and understand the process of walnut blasting. it is the same for the M57? Is there a DIY? Is there another way to clean the runners? Seafoam?

Also, I did search but didn't see much.

I have yet to see a good DIY but haven't looked in a while as mine didnt seem to warrant a cleaning. Walnut blasting is much more common on the 335d since it has a slightly different EGR system which results in more buildup. I would search the e90 m57 forum and the facebook group "North american bmw diesel owners".

I'm assuming its almost exactly the same - find appropriate walnut blasting adapters, rotate engine to make sure valves are closed, and blast away. I'm not sure if the two intake runners would make it easier since you can put the vacuum on one and the blaster in the other? Although the runners are longer so more cleaning and harder to see the valves

[bmwboyee]

This guy seems to have a decent video :