Honda AFRICA TWIN XRV750 (1987-2002) [277/291] Tools and workshop tips
Макгруп McGrp.ru
Задайте вопрос
Зарегистрироваться

Honda AFRICA TWIN XRV750 (1987-2002) [277/291] Tools and workshop tips

Honda AFRICA TWIN XRV750 (1987-2002) [277/291] Tools and workshop tips

Содержание

Похожие устройства

REF 16 Tools and Workshop Tips Installation ot bearings can be eased by placing them in a freezer the night before installation The steel bearing will contract slightly allowing easy insertion in its housing This is often useful when installing steering head outer races in the frame Bearing types and markings Plain shell bearings ball bearings needle roller bearings and tapered roller bearings will all be found on motorcycles see illustrations 5 14 and 5 15 The ball and roller types are usually caged between an inner and outer race but uncaged variations may be found 5 14 Shell bearings are either plain or grooved They are usually identified by colour code arrow 5 16 Typical bearing marking Bearing fault finding If a bearing outer race has spun in its housing the housing material will be damaged You can use a bearing locking compound to bond the outer race in place if damage is not too severe Shell bearings will fail due to damage ol their working surface as a result of lack of lubrication corrosion or abrasive particles in the oil see illustration 5 17 Small particles of dirt In the oil may embed in the bearing material whereas larger particles will score the bearing and shaft journal If a number of short journeys are made insufficient heat will be generated to drive off condensation which has built up on the bearings FATIGUE FAILURE CHATERS OR POCKETS SCRATCHED BY DIRT IMPROPER SEATING BRIGHT POLISHED SECTIONS LACK OF OIL 5 15 Tapered roller bearing A needle roller bearing B and ball journal bearing C Shell bearings often called inserts are usually found at the crankshaft main and connecting rod big end where they are good at coping with high loads They are made of a phosphor bronze material and are impregnated with self lubricating properties Ball bearings and needle roller bearings consist of a steel inner and outer race with the balls or rollers between the races They require constant lubrication by oil or grease and are good at coping with axial loads Taper roller bearings consist ot rollers set in a tapered cage set on the inner race the outer race is separate They are good at coping with axial loads and prevent movement along the shaft a typical application is In the steering head Bearing manufacturers produce bearings to ISO size standards and stamp one face of the bearing to indicate its internal and external diameter load capacity and type see illustration 5 16 Metal bushes are usually of phosphorbronze material Rubber bushes are used in suspension mounting eyes Fibre bushes have also been used in suspension pivots 5 18 Example of ball journal bearing with damaged balls and cages DIRT EMBEDDED INTO REARING MATERIAL OVERLAY WIPED OUT EXCESSIVE WEAR TAPERED JOURNAL 5 19 Hold outer race and listen to inner race when spun race with the other hand see illustration 5 19 The bearing should be almost silent when spun if it grates or rattles it is worn 6 Oil seals Oil seal removal and installation Oil seals should be renewed every time a component is dismantled This is because the seal lips will become set to the sealing surface and will not necessarily reseal Oli seals can be prised out of position using a large flat bladed screwdriver see illustration 6 1 In the case of crankcase seals check first that the seal is not lipped on the inside preventing its removal with the crankcases joined 5 17 Typical bearing failures Ball and roller bearings will fall due to lack of lubrication or damage to the balls or rollers Tapered roller bearings can be damaged by overloading them Unless the bearing is sealed on both sides wash it in paraffin kerosene to remove all old grease then allow it to dry Make a visual inspection looking to dented balls or rollers damaged cages and worn or pitted races see illustration 5 18 A ball bearing can be checked for wear by listening to it when spun Apply a film of light oil to the bearing and hold it close to the ear hold the outer race with one hand and spin the inner 6 1 Prise out oil seals with a large flat bladed screwdriver New seals are usually installed with their marked face containing the seal reference code outwards and the spring side towards the fluid being retained In certain cases such as a two stroke engine crankshaft seal a double lipped seal may be used due to there being fluid or gas on each side of the joint

Скачать