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A15 Main Bearing Caps 2 & 4
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2015/11/10 17:48
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Any reason why the crankshaft bearings for Caps 2 and 4 have an oil passage hole? They don't line up with any other oil passageway. The originals are the same.

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jpg  Caps2&4.jpg (67.21 KB)
20677_5acd75475faff.jpg 2576X1932 px

Posted on: 4/11 3:39
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Re: A15 Main Bearing Caps 2 & 4
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2005/2/23 6:14
From gold coast QLD australia
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I think it lines up with the oil hole in the crank to help feed oil to that side of the shell

Posted on: 4/11 5:26
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Re: A15 Main Bearing Caps 2 & 4
No life (a.k.a. DattoMaster)
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Might be a crap trap for solids out of the oil gallery? Most bearings need reliefs to let wear debris out.

Posted on: 4/11 10:44
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Re: A15 Main Bearing Caps 2 & 4
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The top portion of the bearings are fed oil from the main oil gallery. The half of the bearing contained in the cap is only oiled indirectly, by the film of oil that comes from the top half. That hole in the bearing is not needed, maybe it's there so they can use 2x bearing pieces instead of a unique top & bottom half

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jpg  Lubrication_System.jpg (163.25 KB)
174_5ad11e38d2be7.jpg 992X1024 px

jpg  oil_diagram.jpg (55.08 KB)
174_5ad11e4b991d3.jpg 1024X560 px

jpg  Sealed Power 7135M main bearings.jpg (133.73 KB)
174_5ad127e101967.jpg 1500X466 px

Posted on: 4/13 22:57

Edited by ddgonzal on 2018/4/13 23:17:14
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Re: A15 Main Bearing Caps 2 & 4
No life (a.k.a. DattoMaster)
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The latter. Every extra unique part is extra cost/ complexity so it only goes in if it has to.

Posted on: 4/14 22:26
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