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Hi guys,
I knew this question would be confusing. I'm sorry, but I can't do a scanner posting, so I will try to key in a rough sketch.
This is the top view of one of the main bearings halves, as prepared by Mercedes, BEFORE they come back and widen the bearing. In this case it is the bottom half, and therefore the "O" in the center representing the oil feed coming into the middle of the bearing.
I I
I /I
Il lI
Il O lI
Il lI
I/ I
I I
The "I"s are the outer sides of the bearing.
The "ll"s are the inner edges of the "oil pocket".
The "/"s and ""s are the ends of the pockets.
Remember the oil pockets do not run the entire length of the bearing. The oil pockets are formed by machining the inside edge of the bearing at a 45% angle.
This would be a inside view of the above bearing as seen from the inside, side view.
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______ ______
You can see the oil pocket at the top, and the opening for the oil supply at the bottom.
Now what they do is come back and scrape the bearing sides the entire length of the bearing and about an 1/8th of an inch lower than the oil pocket. This basically "relieves" the bearing and allows the oil to escape out the front and back of this "relief channel".
As shown below, they scrape about 15/1000ths wider on the inside bearing surface down about 3/8ths of an inch on both sides of the bearings. The oil pocket is still there, as it is much deeper, but it has been "relieved" on the ends by this additional scrapping.
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______ ______
Sorry for the crude sketches, and I hope it gets the idea across. If more clarification is needed, simply ask.
Best,
Dave
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