Anybody DIY servicing their S8?

[Delboy]

How was you going to clean it, just wondering what the need for pressurizing the cylinder, that type of tool is to keep the valves closed when changing things like springs or valve stem seals.

If I was to do a decoke I would look into getting the walnut shell blasting equipment, and some suitable bungs for the open ports, and obviously only work on one at time with it at TDC.

[Duffy]

Originally Posted by Delboy

How was you going to clean it, just wondering what the need for pressurizing the cylinder, that type of tool is to keep the valves closed when changing things like springs or valve stem seals.

If I was to do a decoke I would look into getting the walnut shell blasting equipment, and some suitable bungs for the open ports, and obviously only work on one at time with it at TDC.

BMW do a cleaning agent that's meant to be excellent for this.

Pressurising the cylinder is a belt and braces approach to stopping anything going into the cylinder and yes I'd do it at TDC so all the valves are closed.

Wee brushes and plastic scrapers would appear to be the order of the day along with an expendable vacuum cleaner (need to be careful with that as the stuff is inflammable and you don't want to end up with a DIY jet turbine)

[pwacka8]

Just wondering a something like Terraclean could do a job decokeing , i think thats the main aim of Terraclean was to remove deposits from the engine.

[Delboy]

Originally Posted by pwacka8

Just wondering a something like Terraclean could do a job decokeing , i think thats the main aim of Terraclean was to remove deposits from the engine.

It is, however on FSI engines where the fuel is injected straight into the combustion chamber, the only area it can clean are the combustion chamber, and maybe exhaust valves.

The biggest issue on FSI engines is a buildup of carbon deposits on the inlet valves due to the ingestion of crankcase vapours that carry oil into the inlet tract, that would be normally washed away in traditional fuel injection systems where the petrol was injected before the inlet valves.

[Duffy]

Looked at that but everything I've read suggests that it's a fuel line based treatment, in other words it can only clean where the fuel goes, since the inlet manifold and above the inlets see no fuel............

Unfortunately little or no use for any FSI engine.

[Duffy]

http://www.e90post.com/forums/showthread.php?t=682116

I thought this was interesting food for thought.......