Isn't 14 a part of the high-pressure fuel delivery lines to the fuel injectors?

If you look at 4 & 5 closely, you'll find them linked together in pairs, they all connect to the spark plugs underneath (the M104 uses a wasted spark ignition system, so two plugs fire in two separate cylinders in an ignition cycle).

Isn't 6 part of the EGR system? No. 29 is where my PS pump is, I believe that in some W210's they are made of plastic, not aluminium.

Show you how little I know about my own M104, I should be able to identify most of these...

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Steven Harrison

1993 300E2.8 - 196K
2001 E320 4MATIC - 86K