Reciprocating engine big end bearing tension
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The tightening force of the big-end bearing in reciprocating engines is generally measured by the height by which the bearing protrudes above its seat; how then is the pre-tightening force of the big-end bearing determined?
The tension force is proportional to the strength of the bolt material and the bolt diameter: 0.3/1000 for carbon steel, and 0.4/1000 for alloy steel. [The maximum elongation of the connecting rod bolt as measured with a micrometer should not exceed the total length of the bolt.]
Isn’t the clamping force measured by the method of pressing a lead wire?
Measure the elongation of the connecting rod bolts; both sides should be the same. There is no specific standard for this value: 0.3/1000 for [carbon steel] and 0.4/1000 for [alloy steel]
Generally, precision machining is used to ensure its assembly dimensions