Thanks Tom, you made my point.
" You may be able to see a rise in diesel fuel or soot in the oil as blow by
increases or increased iron in the oil from the cylinder wall wear but by
the time you measure these, the damage is done - the cylinder has already
started to wear egg shape & the rings are no longer sealing properly"
Don't buy that one.
Harry
----- Original Message -----
From: "Tom Hargrave" <[EMAIL PROTECTED]>
To: "'Mercedes Discussion List'" <mercedes@okiebenz.com>
Sent: Sunday, October 19, 2008 9:20 AM
Subject: Re: [MBZ] 1990 350SDL
Peter is correct. Oil analysis depends on something to be dissolved or
suspended in the oil to be measured. And think of a bending rod just like
crinkling up a piece of aluminum foil. In both cases, you loose no metal.
You may be able to see a rise in diesel fuel or soot in the oil as blow by
increases or increased iron in the oil from the cylinder wall wear but by
the time you measure these, the damage is done - the cylinder has already
started to wear egg shape & the rings are no longer sealing properly.
Thanks,
Tom Hargrave
www.kegkits.com
256-656-1924
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
On Behalf Of Peter Frederick
Sent: Sunday, October 19, 2008 9:09 AM
To: Mercedes Discussion List
Subject: Re: [MBZ] 1990 350SDL
This is exactly the issue, although the rod will probably continue to
bend and twist until the cylinder had no compression.
It cannot be predicted, oil analysis isn't going to help much, and it
makes people jumpy about these engines, as even one with several
hundred thousand "good" miles may suddenly go bad.
Quite a number were replaced under warrenty, as it can happen in very
low milage (20,000, say), but in a ten year old car you are pretty
much on your own.
Peter
On Oct 19, 2008, at 7:52 AM, LarryT wrote:
Harry asks <<Wouldn't an oil analysis give a clue about rod bending>>
With the symptoms Peter describes (see below) it happens so
suddenly that I'm wondering if there's any advance notice. As far
as the rod bending, would the rod loose parts of itself as it bends?
Plus, if it happens so quickly, even if the Oil Analysis does
provide some indication, I wonder if it would tell me it may fail
in a week, month or year? Does that make sense? Let me try again
- if it happens quickly - let's assume a week for rod bending to
increased oil consumption. who's to say a good analysis today tells
me anything except it's not damaged today? But it can become
damaged next week without further notice.
IOW, OA can tell if there's a problem but who's to say it won't
fail next month?
OA helps diagnose more typical wear problems (rings, bearings, etc)
with more usable info since those problems develop over longer a
time frame.
Make sense?
Peters comments
*** Once the rod bends, the cylinder wears oval in a matter of hours.
They bend in normal service with no prior indications of any kind --
there are three or more versions, and the latest ones weigh several
ounces more than the originals. That means, of course, if you are
fixing one you must buy all six, as the old ones are NOT available.
Usual first indication is a noisy engine and sudden high oil
consumption, sometimes accompanied by significant oil smoke. This
happens from one day to the next, not gradually.***
Sincerely,
Larry T (74 911, 91 300D 2.5T)
www.youroil.net Oil Analysis Kits &
Porsche Posters/Weber parts
----- Original Message ----- From: "harry watkins"
<[EMAIL PROTECTED]>
To: "Mercedes Discussion List" <mercedes@okiebenz.com>
Sent: Saturday, October 18, 2008 9:38 PM
Subject: Re: [MBZ] 1990 350SDL
Larry
Wouldn't an oil analysis give a clue about rod bending? If the
cylinders are being worn, I would think something would show up.
My experience with SOAP made me believe nothing could go undetected.
Harry
I think I'll have a look at the 90 I mentioned - 272K miles, no
oil with 3K chenges, - I'm hoping with that many miles it may not
ben a rod bender and we can get another 100K miles out of the old
girl.
At $4k it should buy a nice big sedan .that cruises smoothly.
Trying to find out if it has both airbags in front -- being a S
Class it may be -
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