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2.
Compare the measurements recorded in Step 1 with the
ranges given in
Table 3-12.
taken in each race differ, use the smallest measure-
ments.
Table 3-12. Race Diameter and
Crank Pin Size
CONNECTING ROD
RACE ID REQUIRED
1.6245-1.6250 in.
Standard
(41.262-41.275 mm)
1.6255-1.6260 in.
0.0010 in. oversize (0.025 mm)
(41.288-41.300 mm)
1.6265-1.6270 in.
0.0020 in. oversize (0.051 mm)
(41.313-41.326 mm)
Greater than 1.6270 in.
Service
(41.326 mm)
Replace races or connecting rod
set.
3.
As an example, assign the following values to the mea-
surements taken in Step 1.
Front connecting rod race diameter: 1.6255 in.
Rear connecting rod race diameter: 1.6250 in.
See
Table 3-12.
For the above example measurements, the
front connecting rod would require a 0.0010 in. (0.025 mm)
oversize crank pin, while the rear connecting rod could use
the standard sized crank pin. The rear connecting rod races
must be lapped so they have the same ID (within 0.0002 in.
(0.005 mm)) as the front rod.
4.
See
Figure 3-74.
Oversize (OS) crank pins are available
in two oversizes: 0.0010 and 0.0020 in. (0.025 and 0.051
mm) OS crank pins will have a blue or red paint dot
applied to the ends of the pins. A blue dot indicates
0.0010 in. (0.025 mm) OS, a red dot indicates 0.0020 in.
(0.051 mm) OS. Standard size crank pins will not be
marked.
5.
Before assembling the flywheel assembly, recheck con-
necting rods as follows:
3-54
If the four measurements
CRANK PIN
REQUIRED
Wear
Limit
exceeded.
(41.288 mm)
(41.275 mm)
www.PlanDeGraissage.org
b0061x3x
Paint dot
Blue = 0.0010 in OS (0.025 mm)
Red = 0.0020 in OS (0.051 mm)
Figure 3-74. Oversize Crank Pin Identification
CAUTION
After the appropriate connecting rod race ID range speci-
fied in RACE DIAMETER AND CRANK PIN SIZE table has
been achieved, verify that the following CONNECTING
ROD SPECIFICATIONS are also met:
CONNECTING ROD SPECIFICATION
Rear . . . . . . . . . . . . . . Difference in ID of two races must not
exceed 0.0001 in. (0.0025 mm).
Front and rear . . . . . . Difference in ID of races in front and
rear connecting rods must not exceed
0.0002 in. (0.005 mm).
Front and rear . . . . . . Races
0.00025 in. (0.0064 mm). (Difference
between largest and smallest ID mea-
surement in any race must not exceed
0.00025 in. (0.0064 mm)).
CAUTION
Fitting components tighter than recommended may result
in seizing and bearing damage when heat expands the
parts. Such damage requires component replacement.
Fitting Sprocket Bearings
If flywheel end play is within tolerance, and if tapered roller
bearings and races pass visual check and have no apparent
wear, the same set may be reinstalled. Make certain all parts
of bearing are installed in exactly the same order in which
they were removed. If any part of bearing assembly is worn,
entire assembly should be replaced.
Fitting Pinion Bearings
See
Figure 3-68.
A pressed-in bushing in the right crankcase
half is the outer race (13). The inner race (12) is pressed on
the pinion shaft.
must
be
round
within
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