Yamaha YZ450FA 2011, Owner'S Service Manual

Page: 164 / 318

4-53
OIL PUMP
CHECKING THE OIL PUMP
1. Inspect:
• Oil pump drive gear
• Oil pump drive shaft
• Rotor housing
• Oil pump cover
Cracks/wear/damage
→
Replace.
2. Measure:
• Tip clearance "a"
(between the inner rotor "1" and outer rotor
"2")
• Side clearance "b"
(between the outer rotor "2" and rotor hous-
ing "3")
• Housing and rotor clearance "c"
(between the rotor housing "3" and rotors "1"
"2")
Out of specification
→
Replace the oil pump
assembly.
3. Check:
• Unsmooth
→
Repeat steps #1 and #2 or re-
place the defective parts.
INSTALLING THE OIL PUMP
1. Install:
• Oil pump drive shaft "1"
• Washer "2"
• Dowel pin "3"
• Inner rotor 1 "4"
• Apply the engine oil on the oil pump drive
shaft and inner rotor 1.
• Fit the dowel pin into the groove in the inner
rotor 1.
2. Install:
• Outer rotor 1 "1"
Apply the engine oil on the outer rotor 1.
Tip clearance "a":
0.12 mm or less (0.0047 in or less)
<Limit>: 0.20 mm (0.008 in)
Side clearance "b":
0.09–0.17 mm (0.0035–0.0067 in)
<Limit>: 0.24 mm (0.009 in)
Housing and rotor clearance "c":
0.03–0.10 mm (0.0012–0.0039 in)
<Limit>: 0.17 mm (0.0067 in)