Yanmar BY Series Service Manual page 95

ENGINE
IMPORTANT
Ensure the bearing inserts, and connecting
rod and cap mounting surfaces are
absolutely clean and oil-free.
2. Install one blue-marked bearing insert in each
connecting rod and one red-marked insert in
each rod cap.
3. Rotate the crankshaft so the journal for the
piston being installed is near BDC.
4. Apply a light coat of clean engine oil to the
bearing insert.
Figure 5-57
5. Install special tool OEM No. 11 6 330 on
connecting rod (Figure 5-57).
6. Lubricate the piston, piston rings, cylinder bore,
and piston ring compressor with clean engine
oil.
Figure 5-58
5-40
7. Position the piston rings so that the ring gaps
are distributed evenly (approximately 120°
apart) around the piston and not in line with the
wrist pin. Install piston ring compressor
(Figure 5-58).
NEVER force piston or drive piston into
cylinder bore. Install using only finger
pressure.
8. Carefully install the connecting rod and piston
so that the arrow on the piston points toward
the front end of the engine (Figure 5-59).
9. Remove special tool (Figure 5-60).
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10. Check bearing oil clearance before proceeding.
See Measuring Oil Clearance on page 5-63.
Pistons and Cylinders
Figure 5-59
IMPORTANT
Figure 5-60
BY Service Manual
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