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Stagger the ring end gaps as shown
main bearing shells (see illustration).Remove the camchain from the crankshaft. Caution: With the crankshaft removed, do not try to remove the piston/connecting rod assemblies from the bottom of the cylinder bore. The piston will not pass the crankcase main bearing webs. If the piston is pulled right to the bottom of the bore the oil control ring will expand and lock the piston in position. If this happens it is likely the ring will be broken. 4 The main bearing shells can be removed Inspection 5 Clean the crankshaft with solvent, using a 25.3 Lift the crankshaft and camchain out 25.4 Push the shells out, don't lever them together Engine, clutch and transmission 2»43 25.6a Inspect the primary gear splines... securely will require a new crankshaft (seeillustrations). 7 Refer to Section 21 and examine the main bearing shells. If they are scored, badly scuffed or appear to have been seized, new shells must be installed. Always renew the main bearing shells as a set. If they are badly damaged, check the corresponding crankshaft journals. Evidence of extreme heat, suchas discoloration, indicates that lubrication failure has occurred. Be sure to thoroughly check the oil pump and pressure relief valve as well as all oil holes and passages before reassembling the engine. 8 Give the crankshaft journals a close visual examination, paying particular attention where damaged bearings have been discovered. If the journals are scored or pitted in any way a new crankshaft will be required. Undersize main bearing shells are not available, precluding the option of re-grinding the crankshaft. 9 Place the crankshaft on V-blocks and check the runout at the main bearing journals using a dial gauge. Compare the reading to the maximum specified at the beginning of this Chapter. If the runout exceeds the limit, the crankshaft must be renewed. Oil clearance check 10The crankshaft main bearing oil Date: 2016-01-14; view: 612
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