STANDARD MAINTENANCE INSTRUCTIONS
General Inspection Information
Procedures for inspection will be the same for most engine and container parts.
inspection instructions are presented here.
Special inspection procedures are covered in the
procedural work package relating to the specific part.
The engines are precision-built and the Repair Standards tables have been fixed at close limits.
The following general instructions apply to all inspection procedures.
Care must be exercised in all phases of inspection.
Inspect finish of all parts.
Mark all parts that require refinishing.
Repair Standards appear in the inspection part of some procedural work packages.
Accompanying illustrations are used to locate points of measurement for repair limits.
standards contain maximum and minimum limits and key clearances for new or repair parts.
The clearances, listed mainly for reference, will automatically be achieved if the mating parts
are within the dimensional tolerances listed in the tables.
In some cases, a part that is out of dimensional tolerance may be used providing that the
mating part has been carefully selected and, when mated, is within the maximum clearance
specified in the "Wear Limits" column of the tables.
In order to assure maximum service and minimum replacement, values in the "Wear Limits"
column indicate the point at which parts may be worn before replacement.
Normally, all parts
that have not worn beyond dimensions shown in the "Wear Limits" column or are not
damaged from corrosion will be approved for service.
The Repair Standards table uses the following symbols:
* – An asterisk in the "Wear Limits" column indicates that the part must be replaced when
worn beyond the limits given in the "Size and Fit of New Parts" column.
L – An "L" following the tolerance dimensions given in the "Size and Fit of New Parts"
column and the "Wear Limits" column indicates a loose fit (clearance).
T – A "T" following the tolerance dimensions given in the "Size and Fit of New Parts"
column and the "Wear Limits" column indicates a tight fit (interference).
Adapters and Hose-To-Boss Elbows
Inspect adapters and elbows for leakage or damaged threads.
Inspect adapters and elbows for damaged or extruded preformed packings caused by excessive
torque when tightening adapters or elbows.
Inspect adapter and elbow seats for scoring, pitting, or corrosion.
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