Yamaha EH63 - Disassembling the Oil Pump; Checking the Oil Pump; Assembling the Oil Pump

OIL PUMP
3-42
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ENGINE
DISASSEMBLING THE OIL PUMP
1. Remove:
• Oil pump cover “1”
2. Remove:
• O-ring “2”
• Outer rotor “3”
• Inner rotor “4”
CHECKING THE OIL PUMP
1. Check:
• Inner rotor “1”
• Outer rotor “2”
Cracks/damage/wear  Replace.
2. Measure:
• Inner-rotor-to-outer-rotor-tip clearance “a” and “b”
Out of specification  Replace.
3. Check:
• Oil pump operation
Rough movement  Replace.
ASSEMBLING THE OIL PUMP
1. Install:
• Crankshaft
(Refer to “PISTONS, CAMSHAFT, CRANKCASE,
AND CRANKSHAFT” on page 3-44.)
TIP
Install the oil pump-related parts after installing the crank-
shaft. If the oil pump-related parts are installed first, the
crankshaft cannot be installed properly.
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b
a
Inner-rotor-to-outer-rotor-tip clearance “a”:
0.0 mm (0.0 in)
Inner-rotor-to-outer-rotor-tip clearance “b”:
0.15 mm (0.0059 in)