TM-9-2815-220-24
AVDS-1790 2CA, 2DA and 2DR Air-Cooled 12-Cylinder Diesel Engines
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL FOR AVDS-1790 2CA, 2DA and 2DR Air-Cooled 12-Cylinder Diesel Engines
TM-9-2815-220-24 - Page 29 of 1563
TM 9-2815-220-24
HOW TO USE THIS MANUAL
xi
HOW TO USE WORK PACKAGES (Continued)
Work Package Steps and Elements
Read through the work package for step-by-step illustrated instructions.
The numbered steps
tell WHAT to do; the lettered steps tell HOW to do it.
Occasionally, a numbered step will
have several lettered steps.
Note that the letter "l" is intentionally omitted because it looks like
the number 1, which could be confusing.
If you are an experienced mechanic, you may need to read only the numbered steps.
If you are
a beginning mechanic, you will want to read all the steps.
If you come to a step that has
already been done, skip that step and go to the next step.
Replacement Work Packages
There are two uses for "Replacement" work packages within this manual.
A Replacement work
package can be performed to gain access to another part or to replace a defective component.
1.
The following comments apply to a Replacement work package used to replace defective
components:
a.
Replacement components are new and usually will not be cleaned and inspected.
Preservatives must be removed from long-term stored components.
b.
Replacement components will be installed.
c.
Defective components will be discarded or sent to a higher maintenance level.
Components sent to depot maintenance must have a completed DA Form 2407.
2.
Most Replacement work packages can also be used for access to another part.
In this case, the
original part is removed and then installed later.
a.
Removed components will be cleaned, inspected, and reinstalled if no defects are found or
repairs have been accomplished.
b.
General cleaning, inspection, and repair will be performed according to general
maintenance instructions in WP 0028.
However, some general cleaning, inspection, and
repairs are included in the maintenance work package where applicable.
c.
A new component will be installed if inspection indicates a component cannot be repaired.
d.
The item that can be removed for access or repair will not be listed under “Mandatory
Replacement Parts."
Also, this part will not be identified as “new” in the INSTALL
section of the work package.
Repair Work Package
This term is used to identify a work package where defective components are disassembled,
repaired, and reassembled.
Most Repair work packages are performed with the component on
the workbench.
A few can be performed with the engine mounted on the overhaul stand.
General maintenance instructions are detailed in WP 0028.
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