Removing The Crankshaft Journal Bearings; Checking The Oil Nozzles; Checking The Crankshaft And Connecting Rods - Yamaha YZFR6V Service Manual

EAS26040
REMOVING THE CRANKSHAFT JOURNAL
BEARINGS
1. Remove:
• Crankshaft journal lower bearings
(from the lower crankcase)
• Crankshaft journal upper bearings
(from the upper crankcase)
NOTE:
Identify the position of each crankshaft journal
bearing so that it can be reinstalled in its original
place.
ET2C01018

CHECKING THE OIL NOZZLES

The following procedure applies to all of the oil
nozzles.
1. Check:
• Oil nozzle
Damage/wear → Replace the oil nozzle.
• O-ring
Damage/wear → Replace.
• Oil passage
Obstruction → Blow out with compressed air.
EAS26070
CHECKING THE CRANKSHAFT AND
CONNECTING RODS
1. Measure:
• Crankshaft runout
Out of specification → Replace the crank-
shaft.
Runout limit C
0.030 mm (0.0012 in)
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 (using plas-
tigauge
0.020–0.044 mm (0.0008–0.0017
in)
ECA13920
CAUTION:
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.
NOTE:
Align the projections "a" on the crankshaft jour-
nal upper bearings with the notches "b" in the up-
per crankcase.
d. Put a piece of Plastigauge
crankshaft journal.
NOTE:
Do not put the Plastigauge
the crankshaft journal.
5-68
CRANKSHAFT
®
)
M MMM M M MMM M M MMM M
®
"1" on each
®
over the oil hole in
MMM