Installing The Oil Seal; Assembling The Crankcase - Yamaha YZ450FX 2019 Owner's Service Manual

2. Check:
• Crankcase
Crack/damage  Replace.
• Oil delivery passages
Obstruction  Blow out with compressed air.
EAM30151

INSTALLING THE OIL SEAL

1. Install:
• Oil seal "1"
New
(to left crankcase)
Installed depth "a"
0.0–0.5 mm (0.00–0.02 in)
1
a
EAM30152

ASSEMBLING THE CRANKCASE

1. Install:
• Bearing cover plate
Bearing cover plate
12 N·m (1.2 kgf·m, 8.9 lb·ft)
LOCTITE®
Bearing cover plate (crankshaft)
22 N·m (2.2 kgf·m, 16 lb·ft)
LOCTITE®
TIP
Install the bearing by pressing its outer race par-
allel.
2. Apply:
• Sealant
(to the crankcase mating surface)
Yamaha bond No. 1215
90890-85505
(Three bond No.1215®)
3. Install:
• Oil nozzle "1"
Oil nozzle
10 N·m (1.0 kgf·m, 7.4 lb·ft)
LOCTITE®
• Dowel pin "2"
• Crankcase "3"
(to the left crankcase)
Crankcase bolt
12 N·m (1.2 kgf·m, 8.9 lb·ft)
TIP
• Apply the lithium-soap-based grease on the O-
ring.
• Fit the right crankcase onto the left crankcase.
Tap lightly on the case with soft hammer.
• When installing the crankcase, the connecting
rod should be positioned at top dead center
(TDC).
• Tighten the bolts in a crisscross pattern in two
stages, with 1/4 turn each.
5-65
CRANKCASE