Yanmar 4BY2, Руководство по обслуживанию, Страница: 95 / 248

ENGINE Pistons and Cylinders
12/05
BY Service Manual 5-33
© 2009 Yanmar Marine International
3. Wash pistons in an appropriate solvent using a
soft-bristled brush.
4. Visually inspect each piston for cracks. Pay
particular attention to the ring lands between
the piston ring grooves.
5. Install a new piston ring. Use a feeler gauge to
measure the side clearance between the ring
and the piston (Figure 5-51). Replace the
piston if not within specification. Repeat with
the second ring.
Figure 5-51
Figure 5-51
Note: The oil ring (third groove) cannot be
measured.
6. Repeat steps for each of the cylinders and the
piston rings for that specific cylinder.
Assemble Piston and Connecting
Rod
1. Ensure the piston and rings are clean and the
ring grooves are not damaged.
2. Oil the wrist pin bore and wrist pin before
assembling.
3. Check the fit of the wrist pin in the connecting
rod. The wrist pin should pass through the
bushing with little force and not have any
significant play (Figure 5-52).
Figure 5-52
Figure 5-52
4. Install one retaining ring in the piston with the
gap in the retaining ring opposite the recess.
5. Orient the piston and connecting rod as shown
for assembly (Figure 5-53). The arrow on top of
the piston must point to the right when the
connecting rod identification marks are visible.
Figure 5-53
Figure 5-53