[W126 Coupe] Oil Pump

[Steve Nervig]

On Jan 31, 2005, at 6:46 AM, Dan Landiss wrote:

> Steve Nervig wrote:
>
>> Dan, it only goes down the first inch or so; the flared area where 
>> the dip-stick O-ring normally seats. It sucks just as well, but much 
>> faster. It actually works just like the dealer's tool works. And it 
>> doesn't collapse from the heat like the little stock tubing does. Try 
>> it, you will be amazed.
>
> I guess I don't have a good mental picture of the dipstick tube. It 
> seems to me that it doesn't reach all the way to the bottom of the 
> sump, so that as soon as the end was uncovered you would be sucking 
> air.
>
> I know that with the skinny tubing, after I hear it start to suck air 
> I can push it down until it touches the bottom of the sump and get 
> more out.
>

Dan, the dip-stick tube goes all the way to within a few millimeters of 
the lowest point in the oil pan. MB engineers designed it that way. It 
will suck virtually all of the oil in the pan. After sucking, you can 
take the drain plug out and no oil will come out.

I should make a revision to my suggestion for using a different tubing. 
I found that 3/8"ID fuel hose worked just right for me. The various 
sized hoses available may have different ODs, so you may have to adjust 
so that you get a reasonably tight fit in the top of the dip stick 
tube. My hose's fit in the top of the dip-stick tube is not real tight, 
but it doesn't seem to affect the suction. YMMV.

Steve


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