Checking The Crankcase; Checking The Timing Chain And Timing Chain Guide; Checking The Oil Strainer; Checking The Bearings And Oil Seal - Yamaha R15 2022 Service Manual

Bearing punch with pilot driver
YSST-951
EAS30390

CHECKING THE CRANKCASE

1. Thoroughly wash the crankcase halves in a
mild solvent.
2. Thoroughly clean all the gasket surfaces and
crankcase mating surfaces.
3. Check:
• Crankcase
Cracks/damage → Replace.
• Oil delivery passages
Obstruction → Blow out with compressed air.
EAS30391
CHECKING THE TIMING CHAIN AND TIMING
CHAIN GUIDE
1. Check:
• Timing chain
Damage/stiffness → Replace the timing
chain and camshaft sprocket as a set.
2. Check:
• Timing chain guide (intake side)
Damage/wear → Replace.
EAS31069

CHECKING THE OIL STRAINER

1. Check:
• Oil strainer
Damage → Replace.
Contaminants → Clean with solvent.
CRANKCASE
EAS31766

CHECKING THE BEARINGS AND OIL SEAL

1. Check:
• Bearings
Clean and lubricate the bearings, and then
rotate the inner race with your finger.
Rough movement → Replace.
• Oil seal
Damage/wear → Replace.
EAS31603

INSTALLING THE BEARING RETAINER

1. Install:
• Bearing retainer "1"
TIP
• Install the bearing retainer "1" with its "OUT"
mark "a" facing outward.
• Apply locking agent (LOCTITE®) to the
threads of the bearing retainer bolt.
Bearing retainer screw
7 N·m (0.7 kgf·m, 5.2 lb·ft)
LOCTITE®
a
1
EAS30397

ASSEMBLING THE CRANKCASE

1. Thoroughly clean all the gasket mating sur-
faces and crankcase mating surfaces with a
scraper "1".
Do not use a screw driver or any sharp in-
struments for removing the gasket.
Scraper
YSST-612
5-61
ENG