Yamaha SR400 2014 Service Manual

OIL PUMP5-41EAS24940REMOVING THE OIL PUMP1. Drain:• Engine oil(completely from the crankcase and oil tank)Refer to “CHANGING THE ENGINE OIL” onpage 3-22.2. Remove:• Clutch assemblyRefer to “CLUTCH” on page 5-28.3. Remove:• Oil pump drive gear “1”• Oil pump driven gear “2”• Oil pump assembly “3”• Gasket “4”EAS24960CHECKING THE OIL PUMP1. Check:• Oil pump drive gear• Oil pump driven gear• Oil pump housing• Oil pump coverCracks/damage/wear  Replace.2. Measure:• Inner-rotor-to-outer-rotor-tip clearance “a”• Outer-rotor-to-oil-pump-housing clearance“b”• Oil-pump-housing-to-inner-rotor-and-out-er-rotor clearance “c”Out of specification  Replace the oil pump.3. Check:• Oil pump operationRough movement  Repeat steps (1) and(2) or replace the defective part(s).EAS25000ASSEMBLING THE OIL PUMP1. Lubricate:• Inner rotor• Outer rotor(with the recommended lubricant)1234Inner-rotor-to-outer-rotor-tipclearance0.070–0.120 mm (0.0028–0.0047in)Limit0.20 mm (0.0079 in)Outer-rotor-to-oil-pump-housingclearance0.09–0.15 mm (0.0035–0.0059 in)Limit0.22 mm (0.0087 in)Oil-pump-housing-to-in-ner-and-outer-rotor clearance0.03–0.08 mm (0.0012–0.0032 in)Limit0.15 mm (0.0059 in)1. Inner rotor2. Outer rotor3. Oil pump housing