Removing The Balancer Shaft Journal Bearings; Removing The Crankshaft Journal Bearings; Checking The Timing Chains; Checking The Crankshaft - Yamaha Vmax VMX17C 2009 Service Manual

EAS2S31094
REMOVING THE BALANCER SHAFT
JOURNAL BEARINGS
1. Remove:
• Balancer shaft journal upper bearings
(from the upper crankcase)
• Balancer shaft journal lower bearings
(from the lower crankcase)
TIP
Identify the position of each balancer shaft jour-
nal bearing so that it can be reinstalled in its orig-
inal place.
EAS26040
REMOVING THE CRANKSHAFT JOURNAL
BEARINGS
1. Remove:
• Crankshaft journal upper bearings
(from the upper crankcase)
• Crankshaft journal lower bearings
(from the lower crankcase)
TIP
Identify the position of each crankshaft journal
bearing so that it can be reinstalled in its original
place.
EAS2S31044

CHECKING THE TIMING CHAINS

1. Check:
• Timing chain
Damage/stiffness → Replace the timing
chain, camshaft sprocket, and crankshaft as
a set.
EAS26070

CHECKING THE CRANKSHAFT

1. Measure:
• Crankshaft runout
Out of specification → Replace the crank-
shaft.
Runout limit C
0.030 mm (0.0012 in)
CRANKSHAFT AND BALANCER
2. Check:
• Crankshaft journal surfaces
• Crankshaft pin surfaces
• Bearing surfaces
Scratches/wear → Replace the crankshaft.
3. Measure:
• Crankshaft-journal-to-crankshaft-journal-
bearing clearance
Out of specification → Replace the crank-
shaft journal bearings.
Journal oil clearance
0.032–0.056 mm (0.0013–0.0022
in)
ECA13920
NOTICE
Do not interchange the crankshaft journal
bearings. To obtain the correct crankshaft-
journal-to-crankshaft-journal-bearing clear-
ance and prevent engine damage, the crank-
shaft journal bearings must be installed in
their original positions.
M MMM M MMM M M MMM M
a. Clean the crankshaft journal bearings, crank-
shaft journals, and bearing portions of the
crankcase.
b. Place the upper crankcase upside down on a
bench.
c. Install the crankshaft journal upper bearings
"1" and the crankshaft into the upper crank-
case.
TIP
Align the projections "a" on the crankshaft jour-
nal upper bearings with the notches "b" in the up-
per crankcase.
c. Oil groove
d. Put a piece of Plastigauge® "2" on each
crankshaft journal.
5-93
M MMM M M MMM M M MMM M MMM
1
a c b