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Standard
Oversize 1
Oversize 2
Oversize 3
b. Determine piston clearance
Minimum bore measurement
-
Maximum Diston measurement
Piston clearance
=
EXAMPLE:
-
=
c. Piston ring/ring groove fit must have correct
clearance. If the piston and
been used, the ring must be removed and the
ring groove cleaned of carbon. The ring should
then be reinstalled. Use
ure the gap between the
Side clearance
2. Piston Ring
The oversize top and middle ring sizes are
a.
stamped on top of the ring.
Oversize 2
Oversize 3
Oversize 4
b. The expander spacer of the bottom ring (oil
control ring) is color-coded t o identify sizes.
67.96mm
m
67.97
m
68.25mm
68.50mm
68.75mm
follows:
as
68.02mm
67.97mm
.05mm piston clearance
have already
ring
feeler gauge to meas-
a
and the land.
ring
0.04-0.08mm
(0.0016-0.003 in.)
0.03-0.07mm
(0.00 12-0.0028 in
0.50mm
0.75mm
1.00mm
The color mark is painted on the expander
spacer.
c. Push the ring into the bore and check end gap
clearance with
NOTE: The end
I
of the oil control ring is unmeasureable. I f the
oil control ring rails show excessive gap, a ll
three components should be replaced.
Top/2nd ring
Oil control
(Rails)
H. Piston Pin
1. Apply a light film of oil to pin. Install in con-
necting rod small end. Check for play. There
should be no noticeable vertical play. If play
exists, check connecting rod small end for
wear. Replace pin and connecting rod as re-
quired.
2. The piston pin should have no noticeable
play in piston. If the piston pin is loose, re-
place the pin andlor the piston.
I. Crankshaft
.
)
1. Crankshaft Run-Out
Support the crankshaft a t both ends on
V-blocks. Measure the amount of crankshaft
run-out on the main bearing journals with a
dial gauge while rotating crankshaft.
Size
Color
Oversize 1
Brown
Oversize 2
Oversize 3
Black
Oversize 4
Yellow
feeler gauge.
a
on the expander spacer
gap
0.2~0.4mm
(.008~.016 in.)
0.2~0.9mm
0.80mm
(0.03 in.)
Visual
free
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