Checking The Tappet Covers And Camshaft Sprocket Cover; Checking The Timing Chain Tensioner - Yamaha MT-03 Service Manual

2. Check:
• Cylinder head
Damage/scratches
• Cylinder head water jacket
Mineral deposits/rust
3. Measure:
• Cylinder head warpage
Out of specification
der head.
Maximum cylinder head warpage
0.03 mm (0.0012 in)
a. Place a straightedge "1" and a thickness
gauge "2" across the cylinder head.
1
b. Measure the warpage.
c. If the limit is exceeded, resurface the cylin-
der head as follows.
d. Place 400 ~ 600 grit wet sandpaper on the
surface plate and resurface the cylinder
head using a figure-eight sanding pattern.
NOTE:
To ensure an even surface, rotate the cylinder
head several times.
Replace.
Eliminate.
Resurface the cylin-
2
EAS00212
CHECKING THE TAPPET COVERS AND
CAMSHAFT SPROCKET COVER
1. Check:
• Tappet covers "1"
• Camshaft sprocket cover "2"
• O-rings "3"
Damage/wear
EAS00210
CHECKING THE TIMING CHAIN
TENSIONER
1. Check:
• Timing chain tensioner
Cracks/damage
2. Check:
• One-way cam operation
Rough movement
chain tensioner housing.
3. Check:
• Timing chain tensioner cap bolt
• Copper washer
• Spring
• One-way cam
• Gasket
New
• Timing chain tensioner rod
Damage/wear
part(s).
5-11
CYLINDER HEAD
Replace the defective part(s).
2
1
3
3
Replace.
Replace the timing
New
Replace the defective