Yamaha XS360 (1976-1982) [20/34] Yamaha xs360 400

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Yamaha XS360 400 INSTALLATION Engine Specifications cont XS400 rod bearings Lubricate the crank and throroughly betöre installation Engine Torque Specifications ROCKER ASSEMBLY Rocker arm shaft diameter Shaft to bore clearance Cylinder head 10 mm 6 mm Tappet cover Rocker arm plug Spark plug Connecting rod bolts Valve adjusting screw Cam sprocket bolts Oil filter housing bolt Exhaust pipe ring nut Crankcase bolts 8 mm 6 mm Oil drain bolt Primary gear Engine sprocket Alternator rotor bolt Oil pressure switch Neutral switch Shift drum stopper VALVES Valve seat width Intake valve stem diameter Exhaust valve stem diameter Valve to stem clearance Intake Exhaust Max allowable run out 22 25 6 9 7 10 9 15 13 16 24 28 9 11 13 16 10 12 15 17 VALVE SPRINGS Free length Inner Outer Tilt replacement limit Inner Outer 15 17 6 9 25 29 29 33 36 58 21 25 7 11 2 3 9 15 CRANKSHAFT Max allowable run out Crank bearing clearance Con rod big end clearance 13 000 13 018 mm 0 5120 0 5127 in 12 964 12 984 mm 0 51199859 0 51199937 in 0 016 0 054 mm 0 00063 0 00122 1 0 1 1 mm 0 03937 0 04330 in 6 975 6 990 mm 0 2741 0 2746 in 6 955 6 970 mm 0 2732 0 2738 in 0 010 0 037 mm 0 00039 0 00145 in 0 030 0 057 mm 0 0012 0 0022 in 0 03 mm 0 0012 in 39 3 mm 1 547 in 42 8 mm 1 685 in 1 7 mm 0 067 in 2 5 1 9 mm 0 075 in 2 5 0 02 mm 0 0008 in 0 020 0 044 mm 0 00079 0 00157 in 0 021 0 045 mm 0 00080 0 00180 in LUBRICATION SYSTEM 4 If the pressure is significantly lower than this remove and inspect the oil pump If the oil pump condition is satisfactory the lack of oil pressure may be caused by worn or damaged bearings OPERATIONAL DESCRIPTION The oil pump is housed beneath the right crankcase cover and is driven by the crank shaft through a reduction gear The pump is the trochoidal type meaning that it con sists of one rotor turning inside another The shape of the rotors gives the pump its name and the action of one working against the other pumps the oil The oil pump sucks oil from the sump The oil passes through a course wire mesh filter before reaching the pump which removes any large impurities which might damage the pump rotors This filter is made course so as not to restrict the passage of oil in low tem peratures The oil pressure relief valve is fitted in conjunction with the pump The relief valve is pre set to operate at a pressure above about 70 psi If the oil pressure reaches this value the relief valve opens and returns some of the oil to the sump After passing through the oil pump the oil is forced through the replaceable oil filter where microscopic impurities are removed The oil filter housing is equipped with a by pass valve In the event that the filter becomes clogged with filtered material oil will flow around it to reach the engine s mov OIL PUMP Removal 1 Drain the oil 2 Remove the kickstarter pinch bolt and carefully pull the kickstarter off the splined shaft Oil pressure gauge fitting 3 Remove the right side footpeg and the ing parts This oil however will not be fil rear brake pedal 4 Remove the alien bolts which secure tered so it is imperative to change the filter at the prescribed intervals to ensure long the right side crankcase cover and take off the cover If the cover is stuck tap around the engine life After leaving the filter the oil enters the sides with a plastic mallet to free it Pull the main oil gallery Here oil passages allow it to cover straight off and do it carefully to avoid be fed directly to the crankshaft main bear damage to the kickstarter shaft oil seal 5 Remove the three alien bolts which ings connecting rod bearings and transmis sion shafts An oil passage running up hold the oil pump and pump gear and take off through the cylinders and head feeds oil to the assembly the camshaft and valve assemblies The main oil passage is also equipped with an oil pres Inspection sure switch which monitors the system for 1 Carefully loosen and remove the three pressure failure and it includes a fitting to at phillips screws which secure the oil pump tach an oil pressure gauge After lubricating the various components rotor cover plate Remove the plate 2 Measure the clearance between the the oil is returned to the sump and the cycle rotor tips with a feeler gauge The specified is repeated CHECKING OIL PRESSURE Oll pressure switch location 1282 1 A special gauge is needed to check the oil pressure It is attached to a fitting on the left side of the crankcase sump see illustra tion 2 Oil pressure should be checked when the engine is at operating temperature Be fore checking be sure that the oil level is be tween the two dipstick marks 3 At 3 000 rpm the oil pressure should be about 42 psi 3 kg cm2 Oil pump assembly alien bolts

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