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Status : Active
Standard Type : Main
Document No : ISO 13778:2017
Document Year : 2017
Pages : 7
Edition : 2
Section Volume : Quality analysis and assurance (ISO/TC 123/SC 5.)
The bearing diametral clearance is determined by the housing diameter, journal diameter and the wall thickness of the two half bearings. Typically, these components will have a total tolerance "stack up" of 50 µm to 60 µm. Current engine development and in particular, the desire for improved engine refinement, has provided a need to decrease the clearance range due to the tolerance "stack up". This document suggests various schemes of selective assembly to achieve such ranges.