123 cubic inch crank shaft main bearing wear.

dewy · Jun 26, 2016

what causes the middle main bearing to wear more than the front and rear main.....curious ......cause out of 4 cranks they all have the high ridge where the oil hole starts and is,worse on opposite side of oil hole,,,,front and rear are smooth.......just curious again.......dewy.......

Janicholson · Jun 26, 2016

The center bearing is surrounded with con rods on both sides, as a result the bearing will wear proportionately more. All cranks are flexible and bend under the strss of combustion pressures. 3 Main bearing engines are prone to this flexing because there are two opposing throws between bearings. 5 Main bearing 4 cylinder engines are far less prone to this issue. Jim

dewy · Jun 27, 2016

thanks jim,,,,what you think about storing crankshafts horizonal or vertical....parts guy said vertical due to warping,,,,,,,any truth to that one...........dewy

Janicholson · Jun 27, 2016

No real difference on the shafts we discuss here. Shafts from a straight 8 supported on eachend might be a different issue, but the real issue is rust. A spray down with corrosion inhibitor, and wrapping in a sealed plastic bag with a dessicant are real factors, especially if the work is to be stopped for a month or more, or put into inventory. Jim

kub6040 · Jun 27, 2016

Red if that crank isn't bent you aren't gonna bend it , and if you need to store anything metal coat it with black oil and then coat with grease over the oil , I had a caterpillar crank stored for 3 years and no rust , that isn't heard of in the south.

123 cubic inch crank shaft main bearing wear.

dewy

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Janicholson

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dewy

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Janicholson

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kub6040

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