Yanmar 3TNV88F Service Manual page 127

Crankshaft and Camshaft Components
Figure 6-69
10. To measure piston ring end gap, insert each
compression piston ring (Figure 6-70, (1)), one
at a time, into the cylinder. Use a piston with the
piston rings removed to slide the ring into the
cylinder bore until it is approximately 1.18 in.
(30 mm) (Figure 6-70, (2)) from the bottom of
the bore. Remove the piston. Measure the end
gap (Figure 6-70, (3)) of each piston ring.
Record the measurements. See Piston Ring on
page 6-8 for specifications.
Figure 6-70
3TNV88F Service Manual
K0001892
1
2
3
K0001964
Note: Always check the piston ring end gap
when installing new piston rings. See
Piston Ring on page 6-8 for
specifications. Use a piston ring end gap
filing tool to adjust the piston ring end
gap on new piston rings.
11. Repeat the above steps for each cylinder and
piston assembly.
■ Inspection of connecting rod
1. Measure the wrist pin bushing bore using a
bore gauge (Figure 6-71, (1)). Replace the
bushing if not within specifications. If the
bushing has been removed, measure the inside
diameter of the connecting rod small end
(Figure 6-71, (2)). See Connecting Rod on
page 6-8 for specifications.
1
2
Figure 6-71
2. Place the connecting rod bearing inserts into
the connecting rod and connecting rod cap.
Install the rod cap and tighten the bolts to the
specified torque.
3. Measure the inside diameter. See Crankshaft
on page 6-7 for specifications.
ENGINE
K0001724A
6-43