Yanmar 3TNV82A-B Service Manual page 217

Crankshaft and Camshaft Components
10. To measure piston ring end gap, insert each
compression piston ring (Figure 6-118, (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 6-118, (2)) from the
bottom of the bore. Remove the piston.
Measure the end gap (Figure 6-118, (3)) of
each piston ring. Record the measurements.
See Piston Ring on page 6-18 for
specifications.
Figure 6-118
Note: Always check the piston ring end gap
when installing new piston rings. See
Piston Ring on page 6-18 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 6-119, (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 6-119, (2)). See Connecting Rod on
page 6-22 for specifications.
TNV DI Service Manual
(1)
(2)
(3)
0001964
(1)
(2)
Figure 6-119
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 6-14 for specifications.
Inspection of Tappets
1. Inspect the tappet contact surfaces for
abnormal wear (Figure 6-120, (1)). Normal
wear will be even as shown in
(Figure 6-120, (2)). Slight surface defects can
be corrected using an oilstone.
(1)
Figure 6-120
ENGINE
0001724A
(2)
0001725
6-85