Kohler CV11-16, Руководство по обслуживанию

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10.4
Section 10
Inspection and Reconditioning
Figure 10-3. Cylinder Bore Crosshatch after
Honing.
4. After resizing, check the bore for roundness,
taper, and size. Use an inside micrometer,
telescoping gauge, or bore gauge to take
measurements. The measurements should be
taken at three locations in the cylinder–at the top,
middle, and bottom. Two measurements should
be taken (perpendicular to each other) at each of
the three locations.
Clean Cylinder Bore after Honing
Proper cleaning of the cylinder walls following boring
and/or honing is very critical to a successful overhaul.
Machining grit left in the cylinder bore can destroy
an engine in less than one hour of operation after a
rebuild.
The fi nal cleaning operation should always be a
thorough scrubbing with a brush and hot, soapy water.
Use a strong detergent that is capable of breaking
down the machining oil while maintaining a good
level of suds. If the suds break down during cleaning,
discard the dirty water and start again with more
hot water and detergent. Following the scrubbing,
rinse the cylinder with very hot, clear water, dry it
completely, and apply a light coating of engine oil to
prevent rusting.
Measuring Piston-to-Bore Clearance
Before installing the piston into the cylinder bore, it is
necessary that the clearance be accurately checked.
This step is often overlooked, and if the clearances
are not within specifi cations, engine failure will usually
result.
NOTE: Do not use a feeler gauge to measure piston-
to-bore clearance–it will yield inaccurate
measurements. Always use a micrometer.
Use the following procedure to accurately measure
the piston-to-bore clearance:
1. Use a micrometer and measure the diameter of
the piston perpendicular to the piston pin, and up
from the bottom of the piston skirt as indicated in
Figure 10-4, based on the model involved.
Measure 6 mm (0.24 in.) on CV11-14, CV460-465
Engines, 8.5 mm (0.33 in.) on CV15,16, CV490-
495 Engines, Above the Bottom of Piston Skirt at
Right Angles to Piston Pin.
Figure 10-4. Measuring Piston Diameter.
2. Use an inside micrometer, telescoping gauge, or
bore gauge and measure the cylinder bore. Take
the measurement approximately
63.5 mm
(2.5 in.) below the top of the bore and
perpendicular to the piston pin.
3. Piston-to-bore clearance is the difference
between the bore diameter and the piston
diameter (step 2 minus step 1).
Flywheel
Inspection
Inspect the fl ywheel for cracks, and the fl ywheel
keyway for damage. Replace fl ywheel if cracked.
Replace the fl ywheel, the crankshaft, and the key if
fl ywheel key is sheared or the keyway is damaged.
Inspect the ring gear for cracks or damage. Kohler
does not offer replacement ring gears. Replace the
fl ywheel if the ring gear is damaged.
Measure Here