Case 770 EX - Page 44

Engine-Engineandcrankcase
Crankcase-Generalspecication
Crankgear
Crankshaft-Bearings
Mainjournaldiameter
79.791–79.810mm(3.141–3.142in)
Mainjournalundersize
0.254mm(0.010in)
0.508mm(0.020in)
0.762mm(0.030in)
1.016mm(0.040in)
Mainbearingwallthickness
2.168–2.178mm(0.085–0.086in)
Mainbearingundersize
0.254mm(0.010in)
0.508mm(0.020in)
0.762mm(0.030in)
1.016mm(0.040in)
Mainjournalclearanceinbearings
0.034–0.103mm(0.001–0.004in)
•
Maximumwearclearance
0.180mm(0.007in)
Crankpindiameter
63.725–63.744mm(2.509–2.510in)
Crankpinundersize
0.254mm(0.010in)
0.508mm(0.020in)
0.762mm(0.030in)
1.016mm(0.040in)
Bigendbearingwallthickness
1.805–1.815mm(0.071–0.071in)
Bigendbearingundersize
0.254mm(0.010in)
0.508mm(0.020in)
0.762mm(0.030in)
1.016mm(0.040in)
Crankpinclearanceinbigendbearing0.033–0.087mm(0.001–0.003in)
•
Maximumwearclearance
0.180mm(0.007in)
Crankshaftthrustwasherthickness
3.378–3.429mm(0.133–0.135in)
Thrustwasheroversize
0.127mm(0.005in)
0.254mm(0.508in)
0.508mm(0.020in)
Widthofmainbearinghousingoverthrustwashers31.766–31.918mm(1.251–1.257in)
Lengthofcorrespondingmainjournal32.000–32.100mm(1.260–1.264in)
Crankshaftendoat
0.082–0.334mm(0.003–0.013in)
•
Maximumwearclearance
0.400mm(0.016in)
Maximummainjournalandcrankpinovalityortaperafter
grinding
0.010mm(0.00039in)
Maximummainjournalandcrankpinovalityortaperdue
towear
0.050mm(0.0019in)
Maximummainjournalmisalignmentcrankshaftresting
onendjournals
0.010mm(0.00039in)
Maximummisalignmentofcrankpinsrelativetomain
journals(ineitherdirection)
0.25mm(0.00098in)
Tolerancefromoutercrankpinedgetocrankshaftcenter
line
±0.10mm(0.0039in)
Maximumcrankshaftangerun-outwithgaugestylus,
over108.000mm(4.252in)diameter(totalgauge
reading)
0.0250mm(0.00098in)
Maximumywheelseateccentricityrelativetomain
journals(totalgaugereading)
0.0400mm(0.00157in)
Sideclearanceofconnectingrodandcrankshaft0.06–0.10mm(0.002–0.004in)
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