Checking The Crankpin Oil Clearance - Yamaha F25C Service Manual

POWR

Checking the crankpin oil clearance

1. Clean the bearings and the connecting
rod.
2. Install the upper bearing into the con-
necting rod 1 and the lower bearing into
the connecting rod cap 2.
NOTE:
• Install the connecting rod bearings in their
original positions.
• Insert the projection a of each bearing into
the slots in the connecting rod cap and con-
necting rod.
3. Put a piece of Plastigauge (PG-1) onto
the crankpin, parallel to the crankshaft.
NOTE:
Be sure not to put the Plastigauge (PG-1)
over the oil hole in the crankpin of the crank-
shaft.
4. Install the connecting rod to the crankpin
3.
5-41
Power unit
NOTE:
Make sure that the marks b of the connect-
ing rod faces towards the flywheel magnet
side of the crankshaft.
5. Tighten the connecting rod bolts to the
specified torques in two stages.
NOTE:
Do not turn the connecting rod until the
crankpin oil clearance measurement has
been completed.
Connecting rod bolt:
1st: 6 N·m (0.6 kgf·m, 4.4 ft·lb)
2nd: 17 N·m (1.7 kgf·m, 12.5 ft·lb)
6D55F11