Intake Valve Cleaning - Walnut Blasting DIY Video

[Kevlar]

This DIY was done by the wonderful people at Bavauto.

http://blog.bavauto.com/15543/

[SneauxM3]

What is funny is about 75% of the owners on here will be too scared to even connect a manual starter hehe

[sullypants1]

Why not just rotate the crank with a socket and breaker bar? Seems like it would be more precise.

Is this a valvetronic thing?

[mhunter29928]

Why not just rotate the crank with a socket and breaker bar? Seems like it would be more precise.

Is this a valvetronic thing?

Because the starter motor is... RIGHT THERE.

Precision is not an issue. When the intake is removed, you will see that the valves on four of the cylinders are closed. On two of the cylinders, they are open. It doesn't matter which particular cylinders are in their respective positions... Just blast the four closed cylinders first, bump the starter to close the remaining two, and then blast those.

[modular93fox]

Because the starter motor is... RIGHT THERE. Precision is not an issue. When the intake is removed, you will see that the valves on four of the cylinders are closed. On two of the cylinders, they are open. It doesn't matter which particular cylinders are in their respective positions... Just blast the four closed cylinders first, bump the starter to close the remaining two, and then blast those.

fool.. What if walnut shells make it's way into othe cylinders.. That starter won't feel the resistance like a simple socket on a breaker bar and bend a valve with the quickness... Next post just did walnut blasting and car won't run right..

[BimmerBreaker]

fool.. What if walnut shells make it's way into othe cylinders.. That starter won't feel the resistance like a simple socket on a breaker bar and bend a valve with the quickness... Next post just did walnut blasting and car won't run right..

You take off the intake manifold and blast the walnut shells STRAIGHT into the head. How the heck would someone get a shell through the solid metal head into another cylinder? If that happens you got bigger problems then carbon build up...!

Heres an image of the job being performed, can you explain how a walnut shell would make its way into another cylinder other than the one being worked on?



Does raise an interesting question, what would happen if walnut did make it through the engine? I'd imagine part of why they use walnut shells is its strong enough to break up the carbon but not strong enough to bend a valve or break anything. There are many types of media they could use (sand, glass, ceramic, beads, etc) and the walnut is not the most efficient at getting carbon build up off (it will get it off, but a smaller media will remove it faster). So that tells me that likely part of the reason they chose walnut is just in case someone really screws this job up and walnut makes it through, that the walnut shell will just shatter and shoot out the exhaust before damaging anything. Its also not like we are talking COMPLETE walnut shells, they are broken down to where they are like big pieces of sand, not full-on nut shells.

[mhunter29928]

fool.. What if walnut shells make it's way into othe cylinders.. That starter won't feel the resistance like a simple socket on a breaker bar and bend a valve with the quickness... Next post just did walnut blasting and car won't run right..

No need for name calling.

And yeah... I forgot to mention, I also tape off the ports with open valves.

[modular93fox]

Is there not a port inside of the intake that connects all of them together.. Maybe for secondary air? Located on the top/ roof of the port. And as far as name calling fool wasn't meant to hurt anyone's feelings. And if walnut shells do get in the cylinder it would bend a valve as it does not compress like air.

It's also a good idea to remove the alternator /starter cable from the jump point just incase the wand slips and touches the starter b+ terminal and blows a fuse

[modular93fox]

No need for name calling. And yeah... I forgot to mention, I also tape off the ports with open valves.

Sorry bout that

[mhunter29928]

Sorry bout that

No problem. We are on the same team here my friend. Error on the side of caution is a good thing. My mind was on time saver mode.

Those ports are for crankcase ventilation.