Yamaha Wr 450 F Owners Manual
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Page 181
4 - 58 ENG OIL FILTER, WATER PUMP AND CRANKCASE COVER (RIGHT) EC4H4600 Bearing 1. Inspect: Bearing Rotate inner race with a finger. Rough spot/seizure → Replace. EC444400 Oil seal 1. Inspect: Oil seal Wear/damage → Replace. ASSEMBLY AND INSTALLATION EC4G5110 Oil seal 1. Install: Oil seal 1 NOTE: Apply the lithium soap base grease on the oil seal lip. Install the oil seal with its manufacture’s marks or numbers facing inward. Bearing 1. Install: Bearing 1 NOTE: Install the bearing by pressing its...
Page 182
4 - 59 ENG OIL FILTER, WATER PUMP AND CRANKCASE COVER (RIGHT) EC4G5220 Impeller shaft 1. Install: Impeller shaft 1 Plain washer 2 Impeller 3 NOTE: Take care so that the oil seal lip is not dam- aged or the spring does not slip off its posi- tion. When installing the impeller shaft, apply the engine oil on the oil seal lip, bearing and impeller shaft. And install the shaft while turning it. Hold the impeller shaft on its width across the flats a with spanners, etc. and install the impeller. T...
Page 183
4 - 60 ENG OIL FILTER, WATER PUMP AND CRANKCASE COVER (RIGHT) Kick crank 1. Install: Kickstarter 1 Plain washer Bolt (kickstarter) NOTE: Install the kickstarter so that the distance a between the kickstarter and the fuel tank is 12 mm (0.47 in) or more. T R..33 Nm (3.3 m · kg, 24 ft · lb) 2. Install: Oil hose 1 Bolt (oil hose) 2 T R..10 Nm (1.0 m · kg, 7.2 ft · lb) 3. Install: Copper washer 1 Oil delivery pipe 2 Union bolt (M8) 3 Union bolt (M10) 4 New T R..18 Nm (1.8 m · kg, 13 ft · lb)...
Page 184
4 - 61 ENG OIL FILTER, WATER PUMP AND CRANKCASE COVER (RIGHT) 2. Install: Water pump housing 1 Bolt (water pump housing) 2 Plain washer 3 Coolant drain bolt 4 T R..10 Nm (1.0 m · kg, 7.2 ft · lb) New T R..10 Nm (1.0 m · kg, 7.2 ft · lb) 3. Install: O-ring Coolant pipe 1 Bolt (coolant pipe) 2 T R..10 Nm (1.0 m · kg, 7.2 ft · lb) Oil filter 1. Install: Oil filter 1 O-ring 2 Oil filter cover 3...
Page 185
4 - 62 ENG BALANCER BALANCER BALANCER Extent of removal: 1 Balancer drive gear 2 Balancer Extent of removal Order Part name Q’ty Remarks BALANCER REMOVAL Preparation for removal Clutch housing Refer to “CLUTCH” section. Crankcase cover (right)Refer to “OIL FILTER, WATER PUMP AND CRANKCASE COVER (RIGHT)” section. Stator Refer to “AC MAGNETO AND STARTER CLUTCH” section. 1 Nut (primary drive gear) 1 Refer to “REMOVAL POINTS”. 2 Nut (balancer) 1 3 Lock washer 1 4 Primary drive gear 1 5...
Page 186
4 - 63 ENG BALANCER REMOVAL POINTS Balancer drive gear and balancer driven gear 1. Straighten the lock washer tab. 2. Loosen: Nut (primary drive gear) 1 Nut (balancer) 2 NOTE: Place an aluminum plate a between the teeth of the balancer drive gear 3 and driven gear 4 . Balancer 1. Remove: Balancer 1 NOTE: When removing the balancer shaft, align the center of the balancer shaft weight a along the line connecting the centers of the crank- shaft...
Page 187
4 - 64 ENG BALANCER ASSEMBLY AND INSTALLATION Balancer, balancer drive gear and balancer driven gear 1. Install: Balancer 1 NOTE: When installing the balancer shaft, align the center of the balancer shaft weight a along the line connecting the centers of the crank- shaft and balancer shaft. 2. Install: Balancer driven gear 1 NOTE: Install the balancer driven gear onto the bal- ancer while aligning the punch mark a on the balancer driven gear with the lower spline b...
Page 188
4 - 65 ENGOIL PUMP OIL PUMP OIL PUMP Extent of removal:1 Oil pump removal2 Oil pump disassembly Extent of removal Order Part name Q’ty Remarks OIL PUMP REMOVAL AND DIS- ASSEMBLY Preparation for removal Clutch housing Refer to “CLUTCH” section. Crankcase cover (right)Refer to “OIL FILTER, WATER PUMP AND CRANKCASE COVER (RIGHT)” section. 1 Circlip 1 2 Plate washer 1 3 Oil pump drive gear 1 4 Oil pump assembly 1 5 Dowel pin 1 6 Outer rotor 2 1 7 Circlip 1 8 Inner rotor 2 1 9 Pin 1 10 Oil pump cover 1 11...
Page 189
4 - 66 ENGOIL PUMP Extent of removal Order Part name Q’ty Remarks 13 Pin 1 14 Washer 1 15 Oil pump drive shaft 1 16 Rotor housing 1 2
Page 190
4 - 67 ENGOIL PUMP INSPECTION Oil pump 1. Inspect: Oil pump drive gear Oil pump driven gear Rotor housing Oil pump cover Cracks/wear/damage → Replace. 2. Measure: Tip clearance a Between the inner rotor 1 and the outer rotor 2. Tip clearance b Between the outer rotor 2 and the rotor housing 3. Out of specification → Replace the oil pump. Tip clearance a: 0.12 mm or less (0.0047 in or less) : 0.20 mm (0.008 in) Tip clearance b: 0.09 ~ 0.17 mm (0.0035 ~ 0.0067 in) : 0.24 mm (0.009 in) Side...