Twin Disc MG-5170DC, Service Manual

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Twin Disc, Incorporated
Cleaning and Inspection
Marine Transmission Service Manual #1020667
Inspection
Housings, Cast Parts, and Machined Surfaces
q
Replace cast parts or housings that are cracked.
q
Inspect bores for wear, grooves, scratches and dirt. Remove burrs
and scratches with crocus cloth or soft stone. Replace deeply grooved
or scratched parts. Do not remove excess material by sanding. This
will cause loss of press of bearings or races.
q
Inspect oil passages for obstructions. If you find an obstruction, remove
it with compressed air or work a wire back and forth through the
passage and flush it with solvent.
q
Inspect machined surfaces for burrs, scratches, nicks and foreign
matter. If you cannot remove the defect with crocus cloth or a soft
stone, replace the part.
q
Inspect ground tapers for burrs or nicks. If you cannot remove the
defect with a soft stone, replace the part.
q
Inspect ground tapers for scratches, galling or scoring damage. If
any of these the defects, replace the part.
q
Inspect threaded openings for damaged threads. Chase damaged
threads with a tap of the correct size.
q
Inspect studs for damaged threads and looseness. Replace defective
studs.
q
Inspect dowel pins for wear or damage. Replace defective dowels.
This applies where a matched set of parts is not involved.
q
Inspect dowel pin holes for wear due to movement between mating
parts. If a dowel pin hole is worn, re-bore and sleeve the hole when
possible. Otherwise, replace the parts. This applies where a matched
set of parts is not involved.