Yamaha XP500 Service Manual page 406

CRANKCASE AND CRANKSHAFT
5 - 75
2. Check:
• crankshaft journal surfaces
• crankshaft pin surfaces
• bearing surfaces
Scratches/wear → Replace the crankshaft.
3. Measure:
• crankshaft-pin-to-big-end-bearing clear-
ance
Out of specification → Replace the big end
bearings.
Crankshaft-pin-to-big-end-bear-
ing clearance
0.026 ~ 0.050 mm
(0.0010 ~ 0.0020 in)
M MMM M MMM M M MMM M
The following procedure applies to all of the
connecting rods.
CAUTION:
Do not interchange the big end bearings
and connecting rods. To obtain the correct
crankshaft-pin-to-big-end-bearing
ance and prevent engine damage, the big
end bearings must be installed in their orig-
inal positions.
a. Clean the big end bearings, crankshaft pins
and the inside of the connecting rod halves.
b. Install the big end upper bearing into the
connecting rod and the big end lower bear-
ing into the connecting rod cap.
NOTE:
Align the projections a on the big end bear-
ings 1 with the notches b in the connecting
rod and connecting rod cap.
c. Put a piece of Plastigauge
shaft pin.
ENG
M MMM M M MMM M M MMM M
clear-
®
on the crank-
MMM