Thread: Seafoam 335d?
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      09-03-2010, 05:16 PM   #8
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Drives: 335i coupe
Join Date: Dec 2006
Location: Denver, CO

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1994 530i  [4.25]
2007 335i Coupe  [4.07]
Just another point, if you are getting serious coking on the valves, don't forget to check the EGR and PCV/breather, as these are usually the first things to get clogged up on a diesel. Most likely to clean the valves properly on a diesel, you will need to remove the intake manifold and clean them individually, this is really the only safe way.

Typically, diesels have very little room between TDC of the piston and the valves, so anything in the cylinder that isn't metered can easily cause damage.