Thanks Peter -
I had used only M1 for years until the difficulty in finding 15W40
and/or 15W50. Plus the cost is not insignificant. But I'd rather pay the
delta & go to 10,000 mile oil changes if it'll get rid of that junk in the
engine. Thanks for the engineering analysis! It's always helpful to see
the details in B&W.
It's all back together at the moment but I might check with my machine
shop and get together on a time to bring the X-over and Intake manifold to
them so they can put it in their engine tank. Cleaning the Upper
Cylinder/Valve Pockets will be more difficult. I might get some or most of
the gunk out buy stuffing paper towels into the upper chamber / valve
chamber and "mop" some of the gunk out - but it'd be hard not to let a piece
fall into a open intake valve. That engine is too valuable not to take the
"easy" route and switch back to Mobil 1.
Thx agn,
Larry
91 300D
-----Original Message-----
From: Peter Frederick
Sent: Sunday, December 18, 2011 9:20 AM
To: Mercedes Discussion List
Subject: Re: [MBZ] Upper Cyl Head Cleaning
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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