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EarlyBay Forums
Technical
Main Bearing Sizes - Why is my case smaller?
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<blockquote data-quote="cunning plan" data-source="post: 579764" data-attributes="member: 4090"><p>So I haven't had a chance to measure the case as it's not here with me, but I do have the old main bearings and the standard new main bearings, so I measured them:</p><p></p><p>Old main bearings:</p><p>Inside diameter: 55.18mm</p><p>Outside diameter: 66.12mm</p><p></p><p>Standard main bearings:</p><p>Inside diameter: 55.64mm</p><p>Outside diameter: 65.69mm</p><p></p><p>Difference:</p><p>ID: 0.46mm Smaller than Standard</p><p>OD: 0.43mm Smaller than Standard</p><p></p><p>Old Thrust bearing:</p><p>ID: 54.87mm</p><p>OD: 65.46mm</p><p></p><p>Standard Thrust bearing:</p><p>ID: 54.87mm</p><p>OD: 64.96mm</p><p></p><p>Difference:</p><p>ID: The Same.</p><p>OD: 1.00mm larger.</p><p></p><p>According to the VWH website, the bearings are measured: Crank / Case / Thrust.</p><p></p><p>https://vwheritage.mobi/GB/#/GB/page.cfm?iPageID=2185" onclick="window.open(this.href);return false;</p><p></p><p>So I'm fairly sure the Thrust bearing is +1.0mm larger than a standard bearing, however, I'm not totally sure how to identify the Crank and Case measurements from the values I have? </p><p></p><p>I would assume the ID is the 'crank' measurement and the OD is the 'case' measurement?</p><p></p><p>Does anyone know? :?</p></blockquote><p></p>
[QUOTE="cunning plan, post: 579764, member: 4090"] So I haven't had a chance to measure the case as it's not here with me, but I do have the old main bearings and the standard new main bearings, so I measured them: Old main bearings: Inside diameter: 55.18mm Outside diameter: 66.12mm Standard main bearings: Inside diameter: 55.64mm Outside diameter: 65.69mm Difference: ID: 0.46mm Smaller than Standard OD: 0.43mm Smaller than Standard Old Thrust bearing: ID: 54.87mm OD: 65.46mm Standard Thrust bearing: ID: 54.87mm OD: 64.96mm Difference: ID: The Same. OD: 1.00mm larger. According to the VWH website, the bearings are measured: Crank / Case / Thrust. https://vwheritage.mobi/GB/#/GB/page.cfm?iPageID=2185" onclick="window.open(this.href);return false; So I'm fairly sure the Thrust bearing is +1.0mm larger than a standard bearing, however, I'm not totally sure how to identify the Crank and Case measurements from the values I have? I would assume the ID is the 'crank' measurement and the OD is the 'case' measurement? Does anyone know? :? [/QUOTE]
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Main Bearing Sizes - Why is my case smaller?
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