Kohler Command Pro CV980 - Manual (Page 93)

9
9.1
Section 9
Inspection and Reconditioning
This section covers the operation, inspection, and
repair/reconditioning of major internal engine
components. The following components are not
covered in this section. They are covered in sections of
their own:
Air Cleaner, Section 4
Carburetor & External Governor, Section 5
Ignition, Charging & Electric Starter, Section 7
Clean all parts thoroughly. Only clean parts can be
accurately inspected and gauged for wear or damage.
There are many commercially available cleaners
that will quickly remove grease, oil, and grime from
engine parts. When such a cleaner is used, follow the
manufacturer’s instructions and safety precautions
carefully. Make sure all traces of the cleaner are
removed before the engine is reassembled and placed
into operation. Even small amounts of these cleaners
can quickly break down the lubricating properties of
engine oil.
Use an aerosol gasket remover, paint stripper, or
lacquer thinner to remove any old gasket material.
Apply the solvent, allow time for it to work, and
then brush the surface with a brassȱ ’›Žȱ‹›žœ‘ǯȱЎ›ȱ
all old material is removed, clean the surface with
isopropyl alcohol, lacquer thinner, or aerosol electrical
contact cleaner. Do not scrape the surfaces, as any
scratches, nicks, or burrs can result in leaks. See
Service Bulletin 252 for further information.
Refer to A Guide to Engine Rebuilding (TP-2150-A)
for additional information. Measurement Guide
(TP-2159-B) and Engine Inspection Data Record
(TP-2435) are also available; use these to record
inspection results.
Camshaft
Inspection and Service
‘ŽŒ”ȱ‘Žȱ•˜‹Žœȱ˜ȱ‘ŽȱŒŠ–œ‘ŠĞȱ˜›ȱ ŽŠ›ȱ˜›ȱŠ–ŠŽǯȱ
ŽŽȱŽŒ’˜—ȱŗȱ˜›ȱ–’—’–ž–ȱ•’ĞȱŠ—Ȧ˜›ȱ’–Ž—œ’˜—Š•ȱ
œ™ŽŒ’ęŒŠ’˜—œǯȱ—œ™ŽŒȱ‘ŽȱŒŠ–ȱŽŠ›ȱ˜›ȱ‹Š•¢ȱ ˜›—ǰȱ
chipped, or missing teeth. Replacement of the
ŒŠ–œ‘ŠĞȱ ’••ȱ‹Žȱ—ŽŒŽœœŠ›¢ȱ’ȱŠ—¢ȱ˜ȱ‘ŽœŽȱŒ˜—’’˜—œȱ
exist.
Crankshaft
Inspection and Service
—œ™ŽŒȱ‘ŽȱŽŠ›ȱŽŽ‘ȱ˜ȱ‘ŽȱŒ›Š—”œ‘ŠĞǯȱȱ‘ŽȱŽŽ‘ȱ
are badly worn, chipped, or some are missing,
›Ž™•ŠŒŽ–Ž—ȱ˜ȱ‘ŽȱŒ›Š—”œ‘ŠĞȱ ’••ȱ‹Žȱ—ŽŒŽœœŠ›¢ǯ
—œ™ŽŒȱ‘ŽȱŒ›Š—”œ‘ŠĞȱ‹ŽŠ›’—ȱœž›ŠŒŽœȱ˜›ȱœŒ˜›’—ǰȱ
grooving, etc. Replaceable bearings are used in the
Œ›Š—”œ‘ŠĞȱ‹˜›Žȱ˜ȱ‘Žȱ˜’•ȱ™Š—ȱŠ—Ȧ˜›ȱŒ›Š—”ŒŠœŽǯȱ˜ȱ
not replace the bearings unless they show signs of
Š–ŠŽȱ˜›ȱŠ›Žȱ˜žȱ˜ȱ›ž——’—ȱŒ•ŽŠ›Š—ŒŽȱœ™ŽŒ’ęŒŠ’˜—œǯȱ
ȱ‘ŽȱŒ›Š—”œ‘ŠĞȱž›—œȱŽŠœ’•¢ǰȱ ’‘˜žȱ—˜’œŽǰȱŠ—ȱ‘Ž›Žȱ
is no evidence of scoring, grooving, etc., on the races
or bearing surfaces, the bearings can be reused.
—œ™ŽŒȱ‘ŽȱŒ›Š—”œ‘ŠĞȱ”Ž¢ Š¢œǯȱȱ‘Ž¢ȱŠ›Žȱ ˜›—ȱ
˜›ȱŒ‘’™™Žǰȱ›Ž™•ŠŒŽ–Ž—ȱ˜ȱ‘ŽȱŒ›Š—”œ‘ŠĞȱ ’••ȱ‹Žȱ
necessary.
Inspect the crankpin for score marks or metallic
pickup. Slight score marks can be cleaned with
crocus cloth soaked in oil. If the wear limits, as stated
’—ȱȃ™ŽŒ’ęŒŠ’˜—œȱŠ—ȱ˜•Ž›Š—ŒŽœȄȱŠ›ŽȱŽ¡ŒŽŽŽǰȱ’ȱ
’••ȱ‹Žȱ—ŽŒŽœœŠ›¢ȱ˜ȱŽ’‘Ž›ȱ›Ž™•ŠŒŽȱ‘ŽȱŒ›Š—”œ‘ŠĞȱ˜›ȱ
regrind the crankpin to 0.25 mm (0.010 in.) undersize.
If reground, a 0.25 mm (0.010 in.) undersize
connecting rod (big end) must then be used to achieve
proper running clearance. Measure the crankpin for
size, taper, and out-of-round.