SERVICE MANUALCRANKSHAFT, MAIN BEARINGS, FLYWHEEL & CRANKCASESection 6Fitting New Main Bearing Caps...Replacement main bearing caps, available for service,require the face and sides of the caps be modified to thedimensions of the old cap to assure a perfect fit in thecrankcase.Modify the caps as follows:1.Place a drill rod or a new drill of any size from 6to 13 mm (1/4 to 1/2 in.) in the bore of the OLDcaps. Measure the distance from the face of thecap (1, Fig. 25) to the drill rod shank with adepth gauge as shown and record the reading.Figure 25. - Measuring Dimension "E"1.Surface "D" main bearing cap faceMeasure the diameter of the drill rod shank with amicrometer and add this reading to the one taken withthe depth gauge, to derive dimension "E" in Fig. 25.NOTE: If the cap being replaced is broken anddimension "E" cannot be determined, use one of theother caps to measure "E". Install and torque thecap before continuing.2.Mill or grind surface "D" (1, Fig. 25) of the NEWcap to dimension "E" plus 0.05 mm (0.002 in.).NOTE: 0.05 mm (0.002 in.) is added to dimension "E"to allow enough stock for a finish cut on surface "D"after the cap and bearing have been fitted to thecrankcase.NOTE: The Bearing Cap must be located on itsmachined side when grinding surface "D" to holdsquareness.3.Clamp the OLD bearing cap to a surface plate(2, Fig. 26).4.Place a drill rod (1, Fig. 26) of any size from 6 to13 mm (1/4 to 1/2 inch) on the inside of the cap(against notched side).Measure this distancewith a micrometer as shown in Fig. 26 andrecord the reading.Figure 26. - Measuring Dimension "A"1.Drill rod2.Plate5.Measure the diameter of -the drill rod shank andadd this reading to the reading taken in step 4above. This will be dimension "A".6.Measure dimension "A" of the NEW bearing capin the same manner as described in steps 2, 4and 5 above.CGES-185-3PRINTED IN UNITED STATES OF AMERICAPage 21
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