Could there be blockage that's keeping the oil from the area where it
normally gets soot? Your repeated comments about the non-black oil
makes me wonder if this problem isn't a normal oil pressure issue....
Luther KB5QHU Oak Park, IL
'87 300SDL (312,xxx mi)
'91 Dodge Ram 150 (290,xxx mi)
On 5/1/2011 2:38 PM, Kaleb C. Striplin wrote:
I drove the car a little bit yesterday and was able to get it to the
point that at hot idle the pressure drops down to about half way
between the bottom and the 1st mark. It pegs when revved up but
without a tach Im not sure what rpm its running. I know that on flat
ground in 4th going about 60 mpg it will be just right off being
pegged. Its not against the peg but its almost there. It does seem
to be low but what I dont get is the fact that this oil is not pitch
black like all other diesel oil I have seen so I still think it might
be something to do with the oil thats in there.
On 4/29/2011 9:31 PM, Kaleb C. Striplin wrote:
wasnt there something about the big bolt where the distributor would
mount if it was a gas car having something to do with the oil pump?
I seem to recall something about this from years ago.
On 4/28/2011 10:08 PM, Dieselhead wrote:
MY recollection is that the OM615 and early 617 have a smaller can
than the OM621. It is in essence, a fram C3 filter size. I never
changed oil on a 615, and Randy should be able to confirm this. I
think it is the same as the 621, where the oil filter cartridge is
only the bypass filter. There is supposed to be a spring in the
bottom of the can. Then the cartridge, then the main filter. The
main filter is a reuseable plastic thing link 4 saucers stacked like
this: ()() When you put the can on the engine, you have to push
the main and cansiter filters down, hold them down with ine finger
until you get the can pressed up against the housing, then screw in
the bolt that holds the can. There are no stem orings like on the
123 OM616/7 and OM60x engines. I have seen 621s with NOTHING in the
filter can that hold good oil pressure. I don't think the problem
is there, but theyre MAY be a valve in the can that controls main vs
bypass. If all the oil is diverted to the bypass, the oil pressure
might drop as in this case.
I would expect more like low pressure until the whole can is
pressurized, then normal pressure, if all the flow went to the
bypass filter. If anyone has a 615 book or a 617 book, this should
be able to be confirmed or refuted.
Maybe, I was trying to remember if those have the o ring deal like
the later cars
Sent from my iPhone
On Apr 28, 2011, at 8:35 PM, Rick Knoble <rickkno...@hotmail.com>
wrote:
I have never heard of bearings wearing out on one of those,
usually the rings would wear out first and it would just loose
compression. The usual cause of bearing problems is it leaks oil
and they let it run out and it causes problems, but then you get
noise. This car has no noise at all, nothing. It is a mystery
indeed.
Oil pressure was down to below .5 bar hot, and would only peg
the gauge at 80mph. That was before anyone did anything... with
fresh Delvac 1300 15w40. It got worse after the dealer oil change.
The hope was that the pressure limit valve was the culprit, but
the bearing shavings in the filter (after only 20 miles of
driving) suggested otherwise.
Wouldn't the oil filter o-ring being bad or missing cause low oil
pressure?
Rick
Who knows nothing about anything older than a 123
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