Kohler SFGLD480 Operation & Maintenance Manual page 294

Presence of foreign material in the exhaust system, resulting in breakage, deformation or knocking of the
turbine impeller blades. Such material can be:
loose items in the exhaust manifold, namely nuts, bolts, washers and parts that were not removed when
-
the turbo was last overhauled,
fragments of broken parts of the engine (valves, valve guides, seats, piston rings...).
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Inadequate part clearance leading to collision of the compressor wheel or turbine wheel with their respective
casing. Incorrect play may result from damaged axial bearings that permit shaft movements beyond normal limits.
Damage to the bearings can originate in:
contaminated lubricant
-
a lack of lubrication
-
- improper balance of a rotating unit
high negative pressure at compressor inlet due to air filter clogging
-
high back-pressure at exhaust gases oultet.
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Abrasion or erosion develop under the action of sands that bite and thin the leading edges of the blades. Sands
and other particles impacting on the blade surface at high speed also produce severe erosion. The presence of
such materials may be due to defective air filtration.
PRODUCT INFORMATION
IO-C-M-45-001e
MAINTENANCE OF TURBOCHARGER
5.2.64
INDEX DATE
B
June 2008
O&M_2.002211.810_A_10_2016
Dep.2
4/4