Section II -- DESCRIPTION

the disassembly of the engine into subassemblies.

publications which are related to the materiel or

its maintenance.

Chapter 6 gives information for cleaning, in-

spection, handling of parts and general repair

(3) Appendix B contains an introduction, a

procedures including overhaul standards, and

list of parts and special tools, and a Federal

the disassembly and assembly of the various

Stock Number index.

engine subassemblies and components.

(4) At the back of Appendix B of the

d. Chapter 7. This chapter covers the

manual are fold-out illustrations which provide

rapid reference for repair parts identification.

assembly of the engine from subassemblies, and

p r o v i d e s pertinent assembly information

These illustrations are numerically keyed to the

items in the repair parts text, and also include

peculiar to the engine, including installation of

accessories.

alphabetical keys for points of measurement for

the maintenance manual overhaul standards.

e. Chapter 8. This chapter outlines the test

and adjustment procedures required to insure

1-4. Organizational, Direct Support,

that an engine has been properly repaired. Also

General Support, and Depot Maintenance

included in this chapter is the information

Allocation

relating to the engine container. Complete in-

Refer to the pertinent maintenance allocation

structions concerning the removal or installation

chart in the Organizational Maintenance

of the engine, repair of the container and engine

Manuals (para 1-2).

preservation and storage have been covered.

1-5. Forms, Records and Reports

f. Appendixes and Indexes.

( 1 ) Following Chapter 8 is an alphabetical

For listings of all authorized forms, refer to the

index for maintenance services outlined in the

current issue of DA PAM 310-2. TM 38-750

manual. This index provides a rapid reference to

contains instructions on the use of forms for

a paragraph and figure in accordance with the

records and reports. Authorized forms for units

subject operation.

maintaining this materiel are listed in Appendix

(2) Appendix A provides a list of

Section II -- D E S C R I P T I O N

ference between this engine model and the

1-6. Differences Between Engine Models

AVDS-1790-2-M model.

a. Engineering improvements were developed

(3) AVDS-1790-2A. The AVDS-1790

on the AVDS-1790 series engines to improve

series engines, having the new oil pan and

engine performance and reliability.

numerous other changes to improve engine

b. The following engine models are available

performance and reliability, is identified as the

in the field :

AVDS-1790-2A model. Basically all models of

( 1 ) AVDS-1790-2-M. This original AVDS-

the engine are similar except for the oil pan, and

1790 series engine developed for the M60

other improvements which are as follows:

vehicle had engine oil pan, Part No. 10865039.

(a) Secondary fuel / water separator filter

In order to use the engine in other vehicles, the

unit (fig. 1-6) replaced the conventional dual

oil pan had to be redesigned. Because engine

replaceable element type filter (fig. 1-3) in late

interchangeability was affected it was necessary

production. All engines produced with secondary

to change the engine model when the new oil pan

fuel filter shall be updated to water separator

was installed on the engine. AVDS-1790-2-M

filter unit at time of engine overhaul.

engines with the new oil pan are identified as

( b ) Relocated oil temperature and

AVDS-1790-2-AM models.

pressure transmitters and switches to the front of

(2) AVDS-1790-2-AM. This was an

the engine for ease of maintenance.

original AVDS-1790 series engine with a new

engine oil pan, Part No. 10912261, which

fuel injection pump drive coupling.

permitted the engine to be used as a replacement

(d) Flexible fuel injector nozzle fuel

engine in certain gasoline engine powered

return lines replaced rigid steel tubes to improve

vehicles. The oil pan change was the only dif-

service life.

1-2