Yamaha MTN850-A 2017 Service Manual page 308

d. Put a piece of Plastigauge® "1" on each
crankshaft journal.
TIP
Do not put the Plastigauge® over the oil hole in
the crankshaft journal.
e. Install the crankshaft journal lower bearings
"1" into the lower crankcase and assemble
the crankcase halves.
TIP
• Align the projections "a" of the crankshaft jour-
nal lower bearings with the notches "b" in the
lower crankcase.
• Do not move the crankshaft until the clearance
measurement has been completed.
f. Tighten the bolts to specification in the tight-
ening sequence cast on the crankcase.
Refer to "CRANKCASE" on page 5-57.
g. Remove the lower crankcase and the crank-
shaft journal lower bearings.
h. Measure the compressed Plastigauge®
width "a" on each crankshaft journal.
If the crankshaft-journal-to-crankshaft-jour-
CRANKSHAFT AND BALANCER SHAFT
1
a
b
1
1
a
b
5-73
nal-bearing clearance is out of specification,
select replacement crankshaft journal bear-
ings.
a
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
4. Select:
• Crankshaft journal bearings (J
TIP
• The numbers "A" stamped into the crankshaft
web and the numbers "B" stamped into the
lower crankcase are used to determine the re-
placement crankshaft journal bearing sizes.
• "J
"–"J " refer to the bearings shown in the
1 4
crankshaft and lower crankcase illustration.
For example, if the crankcase "J
shaft web "J " numbers are 7 and 2 respec-
1
tively, then the bearing size for "J
"J " (crankcase) - "J " (crankshaft web) -1 = 7 - 2 -
1 1
1 = 4 (green)
Bearing color code
Code 0
White
Code 1
Blue
Code 2
Black
Code 3
Brown
Code 4
Green
J J
1 2
–J )
1 4
" and crank-
1
" is:
1
J J
3 4