The black crud is a combination of engine oil and soot from the EGR.
Since we use only Mobil 1 in all our diesels, my brother and I no
longer have problems with the stuff accumulating -- the all had gobs
of gunk when we got them, but after switching to Mobil 1 and
cleaning, the problem is gone.
The gunk accumulates because dino oils will coke (turn to hard slag)
at the temperatures encountered in the intake just down from the EGR
port and the valve stems.
I'd not worry about it other than to scrape out what you can get
from the intake manifold and use synthetic oil if you do not. Have
a care not to let a glob go out the pipe, as I suspect this is one
way those engines get bent rods.
With synthetic oil, the soot slowly washes down with the blowby and
does not accumulate.
Peter
On Dec 18, 2011, at 8:12 AM, Larry wrote:
There are several companies advertising stuff and using before/
after photos of the upper cylinder head area – photos showing the
valve stems being all cruddy looking in the before (or without)
photo and nice clean valve stems in the after/with photo.
OK -- the point? When I removed the intake manifold yesterday
I saw my valve stems and sure enough they were very dirty with all
kinds of black crud (technical term).
Has anyone found a product that actually works to keep the
engine areas cleaner? I’m not sure it would even make the engine
better in any way to be rid of this crud - and yes the intake
manifold is full of the same black stuff.
I guess I just like things to be clean ...
Suggestions? (other than leave it alone or forget about it?)
LarryT
91 300D
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