Honda AFRICA TWIN XRV750 (1987-2002) [105/291] 56 engine clutch and transmission
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Honda AFRICA TWIN XRV750 (1987-2002) [105/291] 56 engine clutch and transmission

Honda AFRICA TWIN XRV750 (1987-2002) [105/291] 56 engine clutch and transmission

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2 56 Engine clutch and transmission bearing Temperatures may increase to the point where the steel backing and the journal turn blue from overheating HAYNES 25 17a Fit new O rings by hand This ensures that oil is being pumped as soon as the engine Is turned over 20 Install the pump with its oil pipe onto the crankcase making sure the pump locates correctly onto the dowel and collars and the pipe is properly inserted into its hole see illustration 25 3b Install the pump bolts and tighten them securely see illustration 25 3a 21 If not already done fit a new O ring onto the pressure relief valve then fit the valve into the pump see illustrations 25 12a and 25 2c Fit the cover over the end of the valve and secure It with its bolt see illustrations 25 2b and a 26 Main and connecting rod bearings general information 1 Even though main and connecting rod bearings are generally replaced with new ones during the engine overhaul the old bearings should be retained for close examination as they may reveal valuable information about the condition of the engine 2 Bearing failure occurs mainly because of lack of lubrication the presence of dirt or other foreign particles overloading the engine and or corrosion Regardless of the cause of bearing failure it must be corrected before the engine is reassembled to prevent it from happening again 3 When examining the connecting rod bearings remove them from the connecting rods and caps and lay them out on a clean surface in the same general position as their 25 17b making sure their tapered sides face out location on the crankshaft journals This will enable you to match any noted bearing problems with the corresponding crankshaft journal 4 Dirt and other foreign particles get into the engine in a variety of ways It may be left in the engine during assembly or it may pass through filters or breathers It may get into the oil and from there into the bearings Metal chips from machining operations and normal engine wear are often present Abrasives are sometimes left in engine components after reconditioning operations especially when parts are not thoroughly cleaned using the proper cleaning methods Whatever the source these foreign objects often end up imbedded in the soft bearing material and are easily recognised Large particles will not Imbed in the bearing and will score or gouge the bearing and journal The best prevention for this cause of bearing failure is to clean all parts thoroughly and keep everything spotlessly clean during engine reassembly Frequent and regular oil and filter changes are also recommended 5 Lack of lubrication or lubrication breakdown has a number of interrelated causes Excessive heat which thins the oil overloading which squeezes the oil from the bearing face and oil leakage or throw off from excessive bearing clearances worn oil pump or high engine speeds all contribute to lubrication breakdown Blocked oil passages will also starve a bearing and destroy it When lack of lubrication is the cause of bearing failure the bearing material is wiped or extruded from the steel backing of the Refer to Tools and Workshop Tips for bearing fault finding 6 Riding habits can have a definite effect on bearing life Full throttle low speed operation or labouring the engine puts very high loads on bearings which tend to squeeze out the oil film These loads cause the bearings to flex which produces fine cracks in the bearing face fatigue failure Eventually the bearing material will loosen in pieces and tear away from the steel backing Short trip riding leads to corrosion of bearings as insufficient engine heat is produced to drive off the condensed water and corrosive gases produced These products collect in the engine oil forming acid and sludge As the oil is carried to the engine bearings the acid attacks and corrodes the bearing material 7 Incorrect bearing installation during engine assembly will lead to bearing failure as well Tight fitting bearings which leave insufficient bearing oil clearances result in oil starvation Dirt or foreign particles trapped behind a bearing insert result In high spots on the bearing which lead to failure 8 To avoid bearing problems clean all parts thoroughly before reassembly double check all bearing clearance measurements and lubricate the new bearings with clean engine oil during installation 27 Crankshaft and main bearings removal inspection and installation ÿ Removal 1 Separate the crankcase halves refer to Section 23 2 Lift the crankshaft out of the left hand crankcase half see illustration If it appears stuck tap it gently using a soft faced mallet 3 If required remove the connecting rods from the crankshaft see Section 28 Inspection 27 2 Lift the crankshaft out of the crankcase 27 5 Check the main bearings as described 4 Clean the crankshaft with solvent using a rifle cleaning brush to scrub out the oil passages If available blow the crank dry with compressed air and also blow through the oil passages Check the cam chain sprockets for wear or damage If any of the sprocket teeth on the left hand end are excessively worn chipped or broken the crankshaft must be replaced with a new one 5 Refer to Section 26 and examine the mam bearings see illustration If they are scored badly scuffed or appear to have been seized new bearings must be installed Always replace the mam bearings as a set If they are

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