The crank was taken apart to clean the sludge trap . While apart stone down the surfaces for a nice flat contact when going back together . This is a good time to polish the crank if you are going to that level . After reassembly make sure it is true . If there is a burr or deri on the surface between the flywheel and journal the main shafts will not be inline . I also check to make sure the balance factor is correct .
Install new plain bearings and check for clearance . I measure the rod bolts before installing them . then make sure they stretch the correct amount . Proper bolt stretch makes the tensile strength correct . I always use new rod bolts from a known manufacturer . I have heard lots of guys say they reuse the bolts but I don't trust that and it is a cheap insurance practice .
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