Quote:
Originally Posted by pixelsblack009
Is there anyway to reduce the amount of carbon build up? and if I scrape it all away including the pistons.... and do the head job will the smoke produced be less?
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You can scrape the Carbon off but as long as the Compression is not good the Carbon will be back. In fact a good running Diesel Engine has some Carbon Build up.
If you can still View those Online Mercedes Service Manuals what to check for the Valve/Head job is there.
One of the issues is that if the Valve Guides are badly worn when the install the Piolt to Grind or Cut the Valve Seates (to make them round again) the Valve Seats will not be cut or ground accurately.
Even if you replace the Valve Seats with New Valve Seats they are supposed to be ground or cut so they are centered on the Valve Guides.
If Valves are not worn too much on their stems and there is enough meat left on the Valve Faces they can also be reused.
Note: The Exhaust Valve Stems are partly Tubular and filled with A Chemical that is OK as long as it is not exposed to the Air. If you cut or crack one the Chemical ignites/explodes.
The purpose of the Chemical is to aid in the heat transfer and keep the Exhause Valves cooler.